The role of violence in prostitution

The role of violence in prostitution This essay will discuss the theories that exist behind this statement and will look beyond the notion that prostitution involves violence to the prostitute herself (which often it does). There are differing views on this statement which usually depend on which philosophical theory is being put forward. Radical feminists as a whole support the view that prostitution is sexual violence for the reasons discussed below. Radical feminists view prostitution as a form of male dominance and exploitation over women and which reinforces the existing patriarchal order of society. They think that prostitution has a very negative and detrimental effect both on the prostitutes themselves and on the whole of society because stereotypical views of women are reinforced when they are viewed as sexual objects which exist for the amusement and delectation of men. The main objection to prostitution by feminists is the male dominance angle, whereby the man who buys the woman has sex with her, but it is not an enjoyable experience and she is forced to try and dissociate herself from the man. In this way she is a mere object of pleasure for the man and the sex act is not given on an equal or mutual basis. The woman is thus reduced to a conduit for the mans gratification. These feminists believe that many clients use the services of a prostitute because they derive satisfaction from the power trip and the control they exercise over the woman during the sex encounter. Catharine MacKinnon thinks that prostitution isnt sex only, its you do what I say, sex.  [1]   Prostitution is seen as a product of the patriarchal societal order in which men are superior to women and where the gender inequality is present in all walks of life. Such views consider that prostitution perpetuates the notion that women can be bought and sold like a commodity, providing sexual services for the sole purpose of satisfying men. Feminists are very critical of the patriarchal ideology which has justified prostitution throughout time. This ideology sees prostitution as a necessary evil with men unable to control their desires and so it is necessary for a small number of women to sacrifice their life and be used and abused by men in order that the majority can be protected from rape and abuse. Here prostitution is seen as form of slavery. These feminists argue that in fact prostitution does not reduce the incidents of rape but in fact it leads to a noticeable increase in sexual violence against women by letting men think it is perfectly acceptable to treat a woman as a s exual repository over which they have ultimate control. In Nevada, the only American state which permits legal brothels, Melissa Farley argues that the states high rape rate is directly connected to legal prostitution.  [2]  Nevada ranks fourth out of the fifty states for sexual assault crimes and its rape rate is higher than the American average. Given that brothels are legal in Nevada one would expect that it would be at the bottom end of the scale in the number of such crimes. Farley argues that legal prostitution creates an environment where women are not humans equal to men and are thus disrespected by men which in turn leads to increased violence against women. Feminists argue that prostitution is detrimental to society and that when society accepts it, the message is sent that it is irrelevant how the woman feels during sex. Some countries are addressing the undesirability of prostitution and in 1999 Sweden became the first country to make paying for sex a crime although being a prostitute was not criminalised. Other countries including Norway and Iceland followed Swedens lead in 1999. These laws reinforce the views of feminists who in their opposition to prostitution also conclude that it is not a practice which can be made safe by reformation and thus they criticise any harm reduction approach. One former Canadian prostitute, Trisha Baptie now campaigns to outlaw the buying of sexual favours and she has said that Harm reduction? You cant make prostitution safer; prostitution is violence in itself. It is rape, the money only appeases mens guilt.  [3]  In this view although the prostitute is seen to be consenting to sex, her acquiescen ce is not freely given and the payment just makes the man think that he has not committed rape because the woman has received a financial benefit. These so called radical feminists see prostitution as a form of violence against women and are adamant that it should be made illegal as in Sweden. These feminists are particularly scathing of another feminist point of view which argues that prostitution should be legalised because it is here to stay. The radical feminists argue that rape and murder have also existed for numerous years and will continue to do so, but no one argues that rape and murder should be made legal. The radical feminists who campaign against the notion of legalising prostitution in order to control and regulate it thereby reducing its harmful effects compare this to the abhorrent notion of legalising domestic violence in order to control and reduce its harmful effects. Just as you cannot legislate to make domestic violence a little bit better the same applies to prostitution. This attitude evolves from their belief that prostitution is sexual violence and should be treated as such whereby it should be eradicat ed not controlled in their eyes. Another major objection to prostitution voiced by feminists is that in most cases a woman who enters into prostitution does not do so on the basis of a cold calculated decision because they are forced by a pimp or human trafficking, the latter being an example of enforced prostitution. Even where the decision is seemingly made voluntarily and rationally it often stems from chronic problems earlier in life. Such problems usually revolve around drug addiction, childhood sexual abuse and similar unsavoury circumstances. In other words, the feminist argument views the decision to become a prostitute as spawning and emanating directly from such earlier experiences and circumstances. If the consent is lacking then you end up with compliance at best. Capacity is vital in making an informed decision and according to one study the average age of children when they become prostitutes is twelve at which age they are not of sufficient age to consent to sex.  [4]  They see such women being dr iven into prostitution which means that sexual violence they may have experienced in childhood or adolescence is extended through their adult lives through prostitution. Feminists argue that most women enter prostitution against their own volition. Prostitutes are generally made up of women from the lower socio economic classes including poor and uneducated women from the most disadvantaged racial and ethnic minorities MacKinnon 1993. MacKinnon also argues that In prostitution, women have sex with men thay would never otherwise have sex with. The money thus acts as a form of force, not a measure of consent, It acts like physical force does in rape.  [5]   Some scholars of prostitution maintain that genuine consent in prostitution is not plausible. One has to search at great lengths through academic literature to find many authors who agree that authentic consent is possible or at least likely.  [6]   Trauma research has been criticized for its failure to attend to social attitudes and behaviors which cause trauma. One of Vanwesenbeecks (1994) respondents described prostitution as volunteer slavery, clearly articulating both the appearance of choice and the overwhelming coercion behind that choice. The extreme violence suffered by these respondents suggests that we can not view prostitution as a neutral activity or simply as a vocational choice. Instead, prostitution must be understood as sexual violence against women (Kemp, Rawlings, Green, 1991). The focus of attention is on changing a social system, which makes prostitution possible. An alternative view of prostitution emanates from the libertarian pro sex work perspective who oppose the radical feminists view that prostitution amounts to sexual violence whereby the sexual act occurs because of coercion exploitation and domination by men. Pro sex feminists argue that prostitution can be an affirmation by women that they have autonomy over their bodies. As such prostitution is an informed and genuinely free choice. Some prostitutes are high class call girls who are well educated and sophisticated women. They realise that at the upper end of the market there are huge sums of money to be made for seemingly very little effort. Pro-sex feminists argue that the selling of sexual favours need not be inherently exploitative and that and accordingly deny that it is sexual violence. Pro sex workers such as Carol Queen argue that the radical feminists who oppose prostitution and view it as sexual violence have failed to take into account the views and opinions of prostitutes themselves, preferring to rely in theory and obsolete experiences.  [7]   Pro sex feminists view the prostitute as being in control and that they in fact control the man as they set the price. Prostitution is seen by some as sexual violence which brings massive economic rewards for some involved. The sex industry, like any other worldwide enterprise, has numerous sectors based in various locations which are controlled by various managers and is expanding as the law and public opinion allow.  [8]   Whether or not one decides if prostitution is sexual violence depends on your view as to the reasons why women participate in prostitution. If prostitution is viewed as a legal form of rape then undoubtedly you will agree with the proposition. It can also be viewed as a form of emotional violence with prostitutes becoming emotionally battered. The radical feminists gender based view that prostitution is a form of male sexual violence against women does not address the fact that male prostitutes exist

The Mirroring Lives of a Jamaican and a Rastafarian Essay -- essays pa

The Mirroring Lives of a Jamaican and a Rastafarian Introduction This paper is a series of two interviews that I had over the course of the semester. I used both of the interviews as a series of research. I then used this research and supported it with published work. The first interview occurred when I was in Jamaica. I randomly crossed paths with Peter. He informed my friends and I that he was a Rastafarian. We spoke with him for about two hours on the beach. He informed us about his religion and his lifestyle. Unaware at the time that I would use this knowledge in my paper I am pleasantly surprised that I was able to transgress this information. The second interview was with Marie Debal. She is one of my sister’s clients. Upon informing my sister about this class and the paper that was due she suggested that I speak with Marie to get information. Marie was the perfect contrast to Peter. She grew up on the island and was raised as a Jamaican woman. Her family traveled a lot with in the island so Marie was very informative about her home land. She came to the United States for college and then stayed to work in New York City working for the Jamaican tourist board. From the interesting aspects that Peter had spoken about I decided to get Marie’s opinion on some of the same topics. I thought these two people would create an interesting contrast to my paper. Today they both live two very different lives but they share very similar backgrounds. Interviewee A background: Name: Peter Age: 30 Home: Jamaica Blue Mountains Occupation: Rastafarian Marital status: none and lives alone Education: self educated by other Rastafarians with in his village Interviewee B background: Name: Marie Debal Age... ...that each of them transgressed into my understanding makes me feel privilege to have even spoken with them. Bibliography Barrow, Steve & Dalton, Peter, Reggae: The Rough Guide New York: Penguin, 1997. Pinkey, http://web.lexis-nexis.com/univer Barrett, Leonard, The Rastafarians Boston: Beacon, 1997. Manely, Michael, The Politics of Change New York: Natural History Press, 1992. Ie: Garvey,1 Kerr, Madeline, Personality and Conflict in Jamaica London: Collins Pub, 1961. Charlie, Susan, Tourism Continues in Jamaica Newsweek, 1997. Zips, Robert, Rastafari New York: Natural History Press, 1993. Winston, Phillip "Revitalization Movements" London: Associated Press, 1995. Cashmore, Ernest, Rastaman: The Rastafarian Movement in England London, Penguin, 1996. Brown, Samuel E., "The Truth About Rastafarians," The Liberator, vol. 3, no.9 Kingston, 1963.

Consumer Decision-Making Styles of Gen Y Consumers in Malaysia

Consumer Decision-Making Styles of Gen Y Consumers in Malaysia Introduction Market segmentation is a crucial element in marketing because goods can no longer be produced and sold without considering consumer needs and recognizing the characteristic of those needs. Due to the highly competitive environment nowadays, attracting and retaining enough loyal customers plays an important key role when developing business strategies.Therefore, business should understand and target consumer from different background and culture differently in order to effectively adapt their marketing strategies (Yeong & Lovett, 2010). In general, there are many demographic variables can be used to segment consumer market, for instance income, age, gender, ethnicity, marital status and household size. Among these variables, gender has been and continues to be one of the most popular forms of market segmentation for a significant proportion of product and services.According to marketing scholars (Meyers-Levy & Sternthal, 1991; Darley & Smith, 1995) argue that gender-based segmentation, especially if it is based on biological sex per se, meets several of the requirements for successful implementation: the segments were easy to identify, easy to access, and large enough for consumer products and services to be marketed profitably. In addition, there are many studies in the past also provided considerable evidence that gender relates to consumers’ perceptions, attitudes, preferences and purchase decisions(Mitchell & Walsh, 2004; Bakewell & Mitchell, 2006).Because gender has been identified as one of the significant factor in understanding consumer behavior and as a fundamental market segmentation index for companies to satisfy their customer’ demand, therefore marketer should endeavor to understand the gender differences in decision-making styles. In addition, research addressing the issue of gender differences in decision-making styles could help marketers to find better ways of communicating with both sexes and to guide marketing mix decisions (Mitchell & Walsh, 2004).Literature Review According to Williams, Page, Petrosky and Hernandez (2010), Generation Y also is referred to as the Millenials or Echo Boomers. They were born during 1977-1994 and are in the 15-32 age range as of 2009. They are children of the original Baby Boomers and their numbers rival that of the Baby Boomers. They grew up in a time of immense and fast-paced change including virtually full-employment opportunities for women, dual-income households as the standard, and having computers at college and home.Moreover Gen Y consumers are more likely to complete their tasks online in just one click in making their decisions (Sengupta & Titus, 2012). Starting in 2000, when the Millennials began attending college, they began to be studied by researchers and marketers to determine the generation’s overriding characteristics. Consumer decision? making styles can be defined â€Å"as me ntal orientations characterizing a consumer’s approach to making choices† (Sproles & Kendall, 1986, p. 268).The aim of Sproles and Kendall (1986) was to provide a potentially useful instrument to assist marketers to better understand consumers’ decision-making styles in purchasing. As consequence, they developed the original 40? item Consumer Style Inventory (CSI) scale, which identified eight characteristics related to consumer decision? making styles. The CSI provides a quantitative instrument for classifying different consumer decision? making styles into distinct categories of shopping orientation.Through empirical research, Sproles and Kendall (1986) defined the following eight categories of decision -making styles namely: 1) perfectionism and high-quality conscious: Consumers carefully search for the best quality in product; 2) brand conscious and price equals quality: Consumer choose to buy more expensive, well known national brands, and believing that a h igher price means better quality; 3) novelty and fashion-conscious: likes new and innovative products and gains excitement from seeking out new things; 4) recreational and hedonistic: finds shopping a pleasant activity and shop just for the fun of it; 5) price conscious and value for money: consumer which has high consciousness of sale price and likely to be comparison shoppers; 6) impulsive and careless: Consumer who do not plan their shopping and appear unconcerned about how much he or she spends; 7) confused by overchoice: These consumer are experiences information overload in the market due to perceiving too many brands and stores and have difficulties making choices and 8) habitual and brand-loyal: These consumers select favorite brands and stores repeatedly overtime. Hiu, Siu, Wang and Chang (2001) revealed three prominent market segments through their study namely: 1. )Trendy, perfectionistic consumers: who frequent shopping and take it as an enjoyment. They are interested in high quality and fashionable items, read fashion magazines, watch various advertisements to gain trendy fashion information and tend to supportive with foreign brand which is high quality and fashionable styling. 2. ) Tradisional, pragmatic consumer: who do not view shopping as a enjoyment activity to them. They are price conscious, not interested in fashion styling and most probably choosing local brands. 3. Confused by overchoice: these consumers tend not to read magazines or advertisement on fashion, avoid exposure to too much information, and only purchase local brands which they are familiar. According to Bakewell and Mitchell (2003), five meaningful and distinct decision-making groups were found in the study of decision-making styles of adult female Generation Y consumers in the UK: â€Å"recreational quality seekers†, â€Å"recreational discount seekers†, â€Å"trend setting loyals†, â€Å"shopping and fashion uninterested† and â€Å"confused tim e/money conserving†. In their later study on decision making styles of male consumers in the UK (Bakewell & Mitchell, 2004), all of the original eight traits plus four new traits namely; store-loyal/low-price seeking, time-energy conserving, confused time restricted and store-promiscuity were identified.From their study it shows that the potential of the CSI for segmenting market as meaningful and different groups of male consumers with different decision making styles. Despite of previous studies which reported gender differences in decision-making styles of consumer, Mitchell and Walsh (2004) compared the decision-making styles of male and female shoppers in Germany. From the research, they managed to verify the construct validity of all eight CSI factors for female shopper and four of the factors for male shoppers. In consequence, they also concluded that male consumers were slightly less likely to be perfectionists, somewhat less novelty and fashion conscious, and less lik ely to be confused when making purchases compared to female consumers.Years after that, Bakewell and Mitchell (2006) undertook a similar study in the UK by using a sample of 480 male and female undergraduate students, they found that nine decision-making style were common to both genders. Through the study they had discovered three traits for male (store-loyal/low-price seeking, confused time-restricted and store-promiscuity) and three new traits for female traits (bargain seeking, imperfectionism and store loyal). There are few studies recently which had attempted to thoroughly explore the antecedent and consequences of consumer decision-making styles. Ghodeswar (2007) found that that seven out of eight dimensions of consumer decision-making style proposed by Sproles and Kendall (1986) in his study of consumer decision-making styles among Indian students.The only style which was not confirmed in his data is â€Å"price consciousness/ value for money consumer†. Gupta, Brantle y & Jackson (2010) found that consumers Generation Y at Midwestern University tend to be brands store loyal when they are buying high involvement product. Kambiz & Fereshteh (2011) found that husband and wife have divergent decision-making styles and their family structure as a social-structural variable can be influenced by the decision-making styles of family members which is related to their purchasing behavior. Lastly, it is believed that male and female consumer in Malaysia may also have certain distinctive characteristic in decision-making during shopping and purchasing.But those characteristic could be have equal interest to both researchers and marketing practitioners. Hence, this paper will fill the gap by focusing on the differences in decision-making styles on gender in the Malaysia context. Methodology According to the past study, most of the researchers prepared a structured questionnaire based on literature review and objectives of the study. Consumers decision-making were measured using the 40-items of Consumer Style Inventory (CSI), developed by Sproles and Kendall (1986). All scales were measured on a 5-point Likert-type scales ranging from 1 (strongly disagree) to 5 (strongly agree). The reliabilities of the CSI scale, according to Sproles and Kendall (1986), ranged from 0. 48 to 0. 76.The scales items were translated into Malay language with minor changes in wording to clarify the meaning. In addition, some demographic questions were included in the questionnaire. And most of the questionnaire was self-administered to non-probability sample of male and female undergraduate students in Malaysia. Finding and Analysis Common Factors for both Male and Female According to the research study of Safiek and Hayatul (2009) in Malaysia, the decision-making of Malaysian young consumer for both gender have similarities namely: 1. ) Quality consciously: meaning that they prefer to buy more durable and quality product. 2. ) Brand consciously: it shows tha t they set high standards and have high expectations for the products they buy.Moreover they choose to buy the product which is heavily advertised and well-know national brands. 3. ) Fashion consciousness: this shows that both genders are seem to gain pleasure from seeking out new things and keep up-to date with fashionable attractive styles. 4. ) Confused by overchoice: This factor shows that they feel over-loaded with the information on various brands products and find it very hard to choose the best product during shopping. 5. ) Satisfying and value seeking: concluded that if both items were identical in both sample, they will carefully find the best value for money product to be purchased which is also satisfied their needs. Male FactorsAgain from the study of Safiek and Hayatul (2009), there are two factors found for males namely brand loyalty and time-energy conserving. For brand loyalty, male consumers score higher than female consumers on this factor because they tend to hav e favorite brands and will use these habitually. Next, time-energy conserving which was not found in females but it characterizes males who often save energy by making their shopping trips as fast as possible in the same stores. Moreover, males have the perception that going shopping is a waste of time and they don’t give their purchases much thought. In overall, both of these results show the similarity with previous researchers, Bakewell and Michell (2006) in the UK. Female factorsFrom the study of Safiek and Hayatul (2009) research, it shows that there are three female factors found namely price consciousness, recreational and shopping avoidance. Female consumers scored higher than male consumers on price consciousness shows that female are more aware of the sale prices and more often choose to purchase lower price products. Next, female shoppers are more particular on recreational or pleasant shopping activity compared to male shoppers. And this factor is consistent with Mitchell and Walsh’s (2004) and Bakewell and Mitchell’s (2006) which characterization of a recreational consumer. The last factor is shopping avoidance which is very exclusive to female consumers and posed an opposite trait of recreational.However the high scored shows that if the shopping is unpleasant, female shoppers will tend to shop as quickly by purchasing the first brands or product that seem to be good enough. Conclusion In conclusion, through the research of consumer decision making styles, it offers a great opportunity to understand the characteristic or style of consumer towards their shopping behavior. And this consumer style inventory provides a fundamental for consumer decision making styles and has practical application advantages for marketers in their marketing strategic. However this study has a limitation because it only covered a specific segment of young adult in an local university in Malaysia.For future recommendation, there is a need to study th ese decision making styles among the larger population across different segment in order to get better converge of Malaysia young consumers. References Sproles, G. & Kendall, E. (1986). A Methodology for Profiling Consumers’ Decision-Making Styles, Journal of Consumer Affairs, Vol. 20 (2), pp. 267-279 Mitchell, V. , & Walsh, G. (2004). Gender Differences in German Consumer Decision-Making styles. Journal of Consumer Behavior, 3(4), 331-346 Bakewell, C. & Mitchell, V. W. (2003) Generation Y Female Consumer Decision-Making styles. International Journal of Retail & Distribution Management, 31(2), 95-106. Bakewell, C. & Mitchell, V. W. (2006).Male versus Female Consumer Decision Making. Journal of Business Research, 59, 1297-1300. Hiu, A. S. Y. , Siu, N. Y. M. , Wang, C. C. L. & Chang, L. M. K. (2001). An Investigation of Decision-Making Styles of Consumers in China. Journal of Consumer Affairs, 35 (2), 326-345. Safiek, M. & Hayatul, S. S. (2009). Consumer Decision-Making Styles in Malaysia: An Exploratory Study of Gender Differences. European Journal of Social Sciences – Volume 10, Number 4 Safiek, M. (2009). An Investigation of Consumer Decision-Making Styles of Young-Adults in Malaysia. International Journal of Business and Management. Vol. 4, No. 4 Darley, W. K. & Smith, R. E (1995).Gender Differences in Information Processing Strategies: An Empirical Test of the Selectivity Model in Advertising Response. Journal of Advertising, 24(1), 41-59. Meyer-Levy, J. & Sternthal, B. (1991). Gender Differences in the Use of Message Cues and Judgments. Journal of Marketing Research, 29 (1), 84-96. Kaylene C. Williams, K. C. , Page, R. A, Petrosky, A. R. & Hernandez, E. H. (2010). Multi-Generational Marketing: Descriptions, Characteristics, Lifestyles, and Attitudes. Journal of Applied Business and Economics, Vol. 11(2) Sengupta, D. & Titus, R. (2012). Evaluating Environmental Variables to assess Exhibited Behaviour: A Study of Gen Y. International Conference on Technology and Business Management Yeong, N. C. & Lovet, M. G. (2010).Consumer Decision-Making Styles of Hispanic American College Students: A Consumer Styles Inventory Approach. American Journal of Business Research, Vol. 3, No 2 Ghodeswar B. M. (2007), â€Å"Consumer Decision-Making Styles Among Indian Students†, Alliance Journal of Business Research, Vol. 3, Spring 2007, pp. 36-48. Gupta, M. , Brantley, A. , & Jackson, V. P. (2010). Product Involvement as a Predictor of Generation Y Consumer Decision Making Styles. The Business Review, Cambridge, Vol. 14, Num. 2 Kambiz, H. H. & Fereshteh, L. (2011). Influence of Family Structure on Consumer Decision-making Style in Iran. International Journal of Business and Management, Vol. 6, No. 11; November 2011

Serial Killers, By Flannery O Connor - 1209 Words

In this world, there are people who are able to shoot, bludgeon, or torture a whole family and then sleep peacefully just hours after. Serial Killers have piqued the American public’s interest for generations. In the 1970s, for example, America was enthralled by the danger and fear of Ted Bundy and John Wayne Gacy, famous serial killers who killed a combined number of over a hundred people. Following suit of the popularity of serial killers, they have become ingrained in our culture through art, books, news, talk-shows, and movies. A famous example of this trend is in Flannery O’Connor’s †A Good Man Is Hard to Find†, where the antagonist, The Misfit, brutally murders a family of six. O’Connor described The Misfit as a calm, polite, analytical, morally-confused, murderer with leadership skills and â€Å"strong white teeth.† This archetype, a person who can be perfectly calm while being aggressive and lacks a sense of right or wrong, has a lso been an interest of study in the medical field. The medical community has come together for patients that are described as lacking a moral conscious, naming their disorder psychopathy (Robinson). In Flannery O’Connor’s †A Good Man Is Hard to Find† The Misfit exhibits signs of psychopathy, shown from his manipulating control over Bobby Lee and Hiram, and staying calm while he directly and indirectly kills six people. Psychopaths, although they differ on an individual basis, are described as fearless, seeing people as beneficial objects,Show MoreRelatedA Proposal1240 Words   |  5 Pages In 1953, the short story â€Å"A Good Man is Hard to Find† was published in the anthology Modern Writing I by Avon Publications. 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With different traits and attitudes of the otherRead MoreA Good Man Is Hard For Find And Everything That Rises Must Converge By Flannery O Connor3294 Words   |  14 PagesFlannery O’Connor, undoubtedly one of the most well-read authors of the early 20th Century, had many strong themes deeply embedded within all her writings. Two of her most prominent and poignant themes were Christianity and racism. By analyzing, â€Å"A Good Man is Hard to Find† and â€Å"Everything that Rises Must Converge,† these two themes jump out at the reader. Growing up in the mid-1920’s in G eorgia was a huge influence on O’Connor. Less than a decade before her birth, Georgia was much different than

What Is the Probability You Just Inhaled a Part of Lincolns Last Breath

Breathe in and then exhale. What is the probability that at least one of the molecules you inhaled was one of the molecules from Abraham Lincoln’s final breath? This is a well-defined event, and so it does have a probability. The question is how likely is this to occur? Pause for a moment and think what number sounds reasonable before reading any further. Assumptions Let’s begin with identifying a few assumptions. These assumptions will help in justifying certain steps in our calculation of this probability. We assume that since Lincoln’s death over 150 years ago the molecules from his last breath are spread out uniformly around the world. A second assumption is that most of these molecules are still part of the atmosphere, and able to be inhaled. It’s worthwhile to note at this point that these two assumptions are what is important, not that the person we are asking the question about. Lincoln could be replaced with Napoleon, Gengis Khan or Joan of Arc. As long as enough time has passed to diffuse the final breath of a person, and for the final breath to escape into the surrounding atmosphere, the following analysis will be valid. Uniform Start by selecting a single molecule. Suppose there are a total of A molecules of air in the world’s atmosphere. Furthermore, suppose that there were B molecules of air exhaled by Lincoln in his final breath. By the uniform assumption, the probability that a single molecule of air that you inhale was part of Lincoln’s last breath is B/A. When we compare the volume of a single breath to the volume of the atmosphere, we see that this is a very small probability. Complement Rule Next we use the complement rule. The probability that any particular molecule that you inhale was not part of Lincoln’s last breath is 1 - B/A. This probability is very large. Multiplication Rule Up until now we only consider one particular molecule. However, one’s final breath contains many molecules of air. Thus we consider several molecules by using the multiplication rule. If we inhale two molecules, the probability that neither were part of Lincoln’s last breath is: (1 - B/A)(1 - B/A) (1 - B/A)2 If we inhale three molecules, the probability that none were part of Lincoln’s last breath is: (1 - B/A)(1 - B/A)(1 - B/A) (1 - B/A)3 In general, if we inhale N molecules, the probability that none were part of Lincoln’s last breath is: (1 - B/A)N. Complement Rule Again We use the complement rule again. The probability that at least one molecule out of N was exhaled by Lincoln is: 1 - (1 - B/A)N. All that remains is to estimate values for A, B and N. Values The volume of the average breath is about 1/30 of a liter, corresponding to 2.2 x 1022 molecules. This gives us a value for both B and N. There are approximately 1044 molecules in the atmosphere, giving us a value for A. When we plug these values into our formula, we end up with a probability that exceeds 99%. Each and every breath that we take is almost certain to contain at least one molecule from Abraham Lincoln’s final breath.

Essay on Pglo Transformation Lab Report - 1486 Words

Transformation Lab Report Introduction Transformation is the transfers of virulence from one cell to another, through the transferring of genetic material. It was originally postulated in 1928 through the works of Federick Griffith, a British microbiologist. Griffith observed that the mutant form, non-virulent form, of the bacteria Streptococcus Pnumoniae could be transformed into the normal, virulent form, when injected into mice along with heat killed normal forms. He concluded that somehow the information the dead virulent form had transformed the mutant form into a virulent form. Later on through the works of Avery, Macleod, and McCarty in 1944, it became obvious that DNA is the transforming property and the substance†¦show more content†¦Spin the two tubes in a centrifuge for 5 minutes on opposite side of the centrifuge. The bacterium will collect at the bottom of the tube, so pour out the extraneous supinate. Then, add 250 microliters of buffer. The Ca2+ cation of the buffer neutralizes the repulsive negative charges of the phosphate backbone of the DNA and the phospholipids of the cell membrane allowing the DNA to pass through the cell wall and enter the cells. Place both tubes on ice. Then add 10 microliters of water into one tube and 10 microliters of plasmid DNA into another tube labeling the one with DNA with a + and the one with water -, and place on ice for 10 minutes. Next heat shocks the tubes for 50 seconds, followed by icing for 10 more minutes. The heat shock increases the permeability of the cell membrane to DNA. Then add 250 milliliters of LB and incubate for 20 minutes. The 20 minute incubation following the addition of LB broth allows the cells to grow and express the ampicillin resistance protein, beta-lactamase, so that the transformed cells survive the subsequent ampicillin selection plates. Plate 100 microliters the + tubes evenly on two plates; 1 of LB and Amp, and one of LB, AMP, and ARA. Plate 100 microliters of the – tubes evenly on two plates; 1 of LB and AMP, and one on LB only. Results Calculations for number of molecules of Plasmid DNA Molecules For initial inflorescence of water and plasmid DNA they did not fluoresceShow MoreRelatedTransformation And Electrophoresis Lab Report1750 Words   |  7 PagesSingee Nguyen Transformation and Electrophoresis Lab Report Purposes Discuss the principles of bacterial transformation. Describe how to prepare competent E. coli cells. Discuss the mechanisms of gene transfer using plasmid vectors. Discuss the transfer of antibiotic resistance genes and tell how to select positively for transformed cells that are antibiotic resistant. Discuss the mechanisms of action for restriction endonucleases. 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This study enables one to observe various traits displayed by transformed bacterial cells. Four experiments were conducted that included (1) Bacterial Transformation, (2) Genomic/Plasmid extraction, (3) DNA Electrophoresis, and(4) Plasmid /Oxidation EMSA. In this study, a transformation

Avail Assignment Samples on Data Communication Network

Task1 :Explain with the aid of diagrams the TCP/IP Protocol Architecture. Discuss the function of the protocols within each layer.Evaluate the application of TCP/IP to internet based applications. TCP/IP architecture model was initially designed as DARPA model by the US government agency by that name. There were four layers in the DARPA model. Those were, application layer, transport layer, Internet layer and network interface layer. Each of those layer used to correspond to one or more layers in the OSI model with seven layers. In the TCP/IP protocol architecture, there are four layers or sets of protocols, similar to the DARPA model. TCP/IP protocol architecture works as protocol stack. Each layer of TCP/IP protocol stack, has its own set of functionalities and provides a set of services to the next layer. The descriptions of these layers are, (Blank, TCP/IP Foundations, 2006) Network Interface layer Network interface layer or network access layer is the lowest layer in the TCP/IP protocol stack. It places TCP/IP packets on the network and receives the same from the network. TCP/IP protocol stack is independent of different network access methods, medium, frame formats etc. Thus it supports different types of networks, different types of LAN technologies like token ring, Ethernet etc., different types of WAN technologies like frame relay, X.25 etc. This layer is independent from different network technologies. It gives the TCP/IP protocol stack the ability to adapt any new networking technology, for example, ATM or Asynchronous Transfers Mode networks. (Blank, TCP/IP JumpStart, 2006) Internet Layer Internet layer sits on the top of network interface layer in the TCP/IP protocol stack. Internet layer is responsible for packaging, addressing and routing of packets. There are some core protocols in this later. These protocols are important for internetworking. The protocols are IP or Internet Protocol, ARP or Address Resolution Protocol, ICMP or Internet Control Message Protocol, IGMP or Internet group management protocol. Each of these protocols performs different types of responsibilities and collectively all these are the responsibilities of internet layer. (Comer, 2006) Internet protocol is responsible for routing packets. Thus functions like routing, IP addressing, packet fragmentation and reassembly are provided by this layer. Address resolution protocol provides services like IP to MAC address translation etc. The main function is to provide address resolution services to the network layer. Internet control message protocol provides different types of diagnosis and error handling services that may occur from erroneous packet delivery. Internet group management protocol manages groups of IP multi-casting. Transport Layer Transport layer provided host to host service on the top of internet layer. It consumes services from the internet layer and provide service to the application layer that is on the top of it. Mainly it provides services related to transmission of data packets successfully over the internet. There are two protocols in this layer. Those are TCP or Transmission Control Protocol and UDP or User Datagram Protocol. (Alani, 2014) Transmission Control Protocol is responsible for providing a connection- oriented, one to one and reliable communication service. It arranges the sequences of packets, acknowledges the packet transmissions, and provides recovery of packets lost during transmission. On the other hand, user datagram protocol is a connectionless, one to many (may be one to one), unreliable service for communication over the internet. Generally, UDP is used to transfer smaller amount of data or data where security or data loss is not a big issue. TCP provides secure and better service than UDP, but there is some additional overhead of TCP services, when some application does not want to have these overhead and still want to have a data transmission, then it selects UDP instead of TCP. (Blank, TCP/IP JumpStart, 2006) Application Layer Application layer is the topmost layer on the TCP/IP protocol stack. It directly interacts with the applications on a computer or system. It provides abilities to the applications to consume services from other layers of the TCP/IP protocol stack. Application layer has a bunch of protocol and new protocols evolve frequently. (Reynders Wright, 2003) Some of the widely used application layer protocols and the services provided by those protocols are, HTTP or HyperText Transfer Protocol, has the responsibility of exchanging user information through developing web pages for World Wide Web. FTP or File Transfer Protocol is responsible for transferring file between two hosts. SMTP or Simple Mail Transfer Protocol is responsible for transferring mails and attachments. Telnet is responsible for emulation or terminal. It let a user log in to some remote network host. DNS or Domain name service helps in resolving the IP address and host names. RIP or Routing Information Protocol helps in routing and exchanging routing information across an IP network SNMP or Simple Network Management Protocol helps in managing different networking devices and manages the same. It helps in collecting and exchanging management information for devices like bridges, routers, intelligent hubs etc. Some examples of application layer interfaces for TCP/ IP protocol stacks may be NetBIOS, Windows Sockets etc. In Windows operating system environment, Windows Socket helps in having a standard API. NetBIOS helps in managing sessions, name resolutions, datagram related protocol services. The illustration of TCP/ IP protocol stacks along will different sets of protocols for each of the layers, has been given as, There are different types of networks used for different organizations, the networks differ in structures, services, interfaces, technologies. Connecting all these networks to have an interconnected network or Internet required some uniformity and platform independent protocols. OSI model was built to abstract the diverse nature of the network. OSI model provides enough abstractions to hide the complexities of networking and internetworking and gives enough scope to the programmer to build specific programs to each layer. Then programs from different layers of OSI model then work with one another. There were several flaws in OSI model. There were no details about the protocols or how to implement the functions of each layer. On the contrary, TCP/IP model gives details about the protocols from each layer. A programmer can implement those protocols from different layers and the job is done. (Held, 2002) OSI model has total 7 layers. Those layers are categorized into two category of layers as given in the following picture. The layers in the OSI model as, Application layer. Presentation layer, Session layer. Transport layer, Network layer, Data Link layer, Physical layer. First three layers belong to the application layer category and rest of the layers belong to the data flow category. On the other hand, there are four layers on the TCP/IP model. Those are application layer, transport layer, internet layer, and network access interface layer. These four layers covers the seven layers of OSI mode. The layers on the TCP/IP model are again divided into two categories. Application and transport layers are categorized as protocols layers and rest two belongs to networks layers. The comparison between OSI model and TCP/IP model are summarized as,(Alani, 2014) Open System Interconnection (OSI) Model TCP /IP Model This is more focused on architectural aspects of a network model and provides an idealistic view. It is more focused on the implementation aspects and provides some realistic view. OSI model is developed by a horizontal approach. It is developed based on a horizontal approach. The basic assertion behind the OSI model is that operation of distributed applications is laid upon a strict hierarchy of layers and standardisation. The basic assertion of TCP/IP model is that any application is composed of a set of functions over an end to end distributed communication service. There is a pool of application service elements or ASEs a distributed application selects an element from such pool and performs functions that is specific to the end to end service. Abstraction is the fundamental characteristic here. Every application assumes that services from lower layer will be available at any point of time. The session layer controls the sessions, presentation layer controls the representation of data etc. and the application layer communicated with the application on the host system. In OSI model, all these are different layers. Some examples of functions of OSI application layer are, VT, FTAM ,MHS, CMIP, DS etc. In the TCP/IP model, application, session and transport layers of the OSI model have been clubbed into application layer of TCP/IP model. Some example of protocols from application layer of TCP/IP model are, FTP. HTTP, DNS. Telnet etc. (Alani, 2014) The transport layer of OSI is responsible to deliver information from source system to destination system. The transport layer communicates from source to destination, performs flow control, error checking etc. The network layer provides connection oriented and connectionless services. The internet layer on the TCP/IP provides only connectionless service. Data link layer prepares the streaming of data, handles flow control, error control. Whereas data is transmitted through the physical media as a raw bit stream. The later part is handled by physical layer. Here data transmission is handled by network access layer only. Services provided by data link and physical layers in the OSI model are provided by the network access layer in the TCP/IP model. While implementation of the OSI model, the emphasis is on reliability of data transfer. The reliability is handled as an individual cases of end to end delivery. Detection and handling of errors is performed in each layer using checksums. Detection and handling of errors is done by the transport layer only. OSI model is most of the time a theory based description of an ideal network model, whereas TCP/IP model is a model that is being used in practice for long time. Task 2 :1 Explain the principles of IP addressing based on IPv4 and discuss the key practical issues in implementing IP addressing within public and private networks.2 With the aid of a network diagram explain how IP addresses are assigned to a network.3 With the help of a network monitoring tool (Wireshark), analyses the IP traffic. IPv4 or Internet Protocol version 4 is a widespread and currently used internet addressing scheme. A network connects different types of devices as hosts. An internet is an interconnection of different types of networks across the globe. It is necessary to uniquely address each of the host connected to the internet. For that purpose internet address or IP addresses are used. There are different schemes of IP addressing. IPv4 is a 32 bit IP addressing scheme. With 32 bits, possibly there will be 232 unique IP addresses. IPv4 addressing uses a class-full addressing. Implementation of IP addresses in private and public networks has some challenges. One is, there is scarcity of addresses that can serve need of the networks and devices. Thus, there are two types of addressing used in private and public network. The addressing scheme used within a private network is not visible from the public network. Masquerading, NAT etc. are used to implement it. However, it increases overhead on routers. (Comer, 2006) On the other hand, there are two types of IP addresses, static and dynamic. ISPs use a pool of available IP addresses, when some client logs on to their network and request some IP address, then the ISP allocates one IP address from the address pool. The IP address is valid for that client for that session only. When the client logs off, the address will be de-allocated and will go back to the address pool. This scheme is known as dynamic IP address. Where the IP address is not tied to some device. The same client may get different IP address when it logs in again. And the same IP address may be allocated to other client next time. On the other hand, there are other types of IP addresses that are tied to a particular device. These are called static IP addresses. (Held, 2002) NAT or Network Address Translation is used to bridge the gap between private and public network. A NAT table is kept on the router. There may be at least two attribute for each entry of the NAT table, the IP addresses of a device in the private network and the IP address of the destination of the packet. The router checks the NAT table, replaces the source address as the public address of the network and forwards the packet to the destination. When it receives some packet from the Internet or other network, then it checks the NAT table again and forwards the packet to the destination. For public networks, there is no existence of the private network, they communicate with the public IP address of the network. There are RIR or Regional Internet Registry that are organizations for handling registration and allocation of IP addresses in different parts of the world. There are 5 RIRs currently for different regions of the world. Following picture illustrates the RIRs and operating domains. Each of the RIR has 16 millions of IP addresses to allocate. In IPv4 scheme, the whole address space is divided into 5 categories those are, Class Address Range of first Octet Network and Host octets Class A 1 to 126 N.H.H.H Class B 128 to 191 N.N.H.H Class C 192 to 223 N.N.N.H. Class D NA Reserved for Multi casting Class E NA Reserved for Research and Future use. There are several disadvantages of IPv4 addressing scheme. The blocks dont have equal number of networks or hosts. For example, there is huge numer of hosts possible for a Class A IP address but in reality no class A IP address contains that many hosts. On the other hand very few hosts are possible for a Class C IP address. So, there is a mismatch between the requirement and availability. Here comes the major disadvantage of IPv4 addressing schemes. There are unused IP addresses but those cant be allocated. The available IP addresses are depleting and has failed to cater the requirement of growth of internet. (Reynders Wright, 2003) As a result IPv6 has been developed. Task 3: local business TCS Ltd. is considering implementing IPv6 Protocol throughout the organization.Present a report for the Operational Director highlighting and discussing the key issues in migrating from IPv4 to IPv6 addressing.The report should Discuss the benefits and drawbacks in such migration. Explain and evaluate the alternative transition mechanisms Analyze and evaluate the improvement in quality of service (QoS) and security. Introduction The aim of this report is to discuss and highlight the key issues in implementation of IPv6 protocol for the organization TCS Ltd. In the rest of the parts of the report the discussion will focus on different aspects of implementing IPv6 in the organization, the benefits and drawback of the implementation, explanation and evaluation of other alternative transition mechanisms, analysis and evaluation of possible improvement in QoS or Quality of Service and security. IPv6 IPv6 or Internet Protocol version 6 is the latest and updated version of the communication protocol IP in the TCP/IP model. It helps in identification and location of a host system in the internet uniquely and routing traffic from source to destination on the Internet. IPv6 has been developed by IETF or Internet Engineering Task Force. One of the major issue with IPv4 is rapid depletion of the available IP addresses and poor distribution of the same. To deal with this problem IPv6 has come into the picture. It is slowly replacing IPv4. IPv6 is a 128 bit addressing protocol and holds almost 2128 unique addresses into its address space. IPv6 is not interoperable with IPv4. Thus one is needed to be replace by other. There are various transition mechanisms from going to IPv6 from IPv4. (Hagen, 2014) A 128 bits IPv6 address is broken down into 8 groups of four hexadecimal digits in each group. Each of the group is separated by a colon. There are compression methods available to shrink or expand representation of an address. Benefits and Drawbacks of Implementation of IPv6 One of the major benefits of IPv6 is the larger address space and classless distribution of addresses. The address allocation methods of IPv6 facilitates route aggregation and limits extensions of routing table. It support multicasting in a simpler and extended way. There are several optimizations for delivery of services. It enhances mobility, configuration and security of the devices. So, other benefits of IPv6 for an organization are, (Johnson, Perkins, Arkko, 2004) It provides better and more effective routing. The routing tables are reduced in sizes. A hierarchical approach in management of routing table can be taken. The ISPs can aggregate their networks into a single prefix. Fragmentation is done by the source in the IPv6 network, the routers are not responsible for it. Thus overall overhead from routing is reduced and routing has become more efficient. Processing of packets in IPv6 networks is better and simpler. Thus more efficient. There is no calculation of packet level checksum and no calculation of checksum at every hop. The link layer protocols and technologies handles this part. Ipv6 supports multicasting. It allows packet flows that are bandwidth intensive, to more than one destination at the same time. Thus the network bandwidth is saved. The hosts that are not bound to process broadcast packets. There is a additional data field in the IPv6 header, called Flow Label. This data field helps in identifying data packets belonging to the same data flow. Configuration of a network for the organization will be automated if it is built on Ipv6. The prefix of all local links to a router will be advertised. A host will be able to generate its own IP address. The MAC address of the host will be appended to the prefix sent by the router. Then it will be converted into some 64 bit EUI or Extended Universal Identifier format. The prefix is another 64 bit, thus the whole address will be 128 bit. There is no need to use NAT or Network Address Translation anymore. At the IP layer, the end to end connectivity will be provides. New services can be added. The peer to peer networks are easily manageable. VoIP, QoS etc. will be more effective. Security is another issue in any type of networks. IPv6 supports IPSec and provides CIA principles of confidentiality, integrity and authentication. ICMP packets for IPv6 are backed up with more security implementations of IPSec and the risks of malware attacks through these packets has been reduced. Apart from the benefits there are few drawbacks of IPv6. Those are, Still IPv6 is not widely accepted and those are not interoperable with IPv4. There is lack of smooth transition schemes to transit from IPv4 to IPv6. Alternative Transition mechanisms Some alternative transition mechanisms to transit to IPv6 from IPv4 are, Host to host Encapsulation In this method, the encapsulation is done at the source and the destination encapsulates it. A private IPv4 network without any information about the IPv6 protocol, is used to transfer the datagrams from the source to the destination. In the following picture, the illustration has been shown, including two hosts with dual IPv4 and IPv6 stacks. These stacks are used for encapsulations. IPv6 datagrams are sent as IPv4 packets. On the destination end, the hosts are updated to IPv6 protocol and will be able to de-capsulate the packets. (John J. Amoss, 2007) This transition mechanism does not require to change the existing IPv4 network, rather it use encapsulation to transit to the IPv6 network. Tunneling from router to router In this mechanism, a tunneling method connecting routers of the organization will be used along with the encapsulation schemes. On the originating host, the edge router will be placed. Another edge router on the destination host will be responsible for the de-capsulation. (Raicu Zeadally, 2003) There will be a tunnel between the edge routers at two ends. Again there will be two protocol stacks of IPv4/ IPv6 at two ends. These stacks will be supported by the hosts at both ends. Again, the source will encapsulate the packets, that will flow through the tunnel and the destination will de-capsulate the packets. Following picture illustrates the idea. The dual stacks at the both ends are needed to be supported by the edge routers. QoS and Security IPv6 provides better QoS and Security compared to the same in IPv4. IPv6 protocol helps in identifying payload that are time sensitive or not. A network can have two types of these packets. It helps in reducing the time in retransmission. IPv6 helps in setting priorities for data transmissions that provide low latency. Applications can select from the priority list as per requirement. A source of significant delay in packet transmission is fragmentation of packets. In IPv6 fragmentation is handled in different way. There is a negotiation between the source and the destination devices about the maximum size of the payload and other parameters are adjusted accordingly. It reduces latency and fragmentation significantly thus helps in better utilization of the network resources. There is QoS implementations on each of the networking device. On the other hand, security of IPv6 protocol is more stringent than the same in the IPv4 protocol. IPSec is an important part of the security mechanisms in IPv6. End to end security is ensured in IPv6. (Li, Jinmei, Shima, 2010) Conclusion In this report IPv6 and different aspects of IPv6 implementation have been discussed. There is a brief description of IPv6 along with discussion on benefits and drawbacks of IPv6, transition mechanisms, QoS and security etc. have been also discussed. Task 4: TCS Ltd. is also considering the provisioning of voice over IP (VoIP) and mobile IP (MIP) for its employees. It is anticipated this will both reduce operational costs and increase network efficiency.Make a business case for such implementation. The Business Case should Explain the underlying concepts of VoIP and MIP. Analyze and evaluate mobile IP networks, particularly examining routing and security issues. Analyze and evaluate the VoIP and MIP in the Enterprise networks. Introduction The aim of this report is to provide information of VoIP and MIP as requested by the TCS Ltd. The organization wants to implement these protocols and technologies for their employees. The organization wants to focus on the reduction of operational cost and modifying efficiency of network. VoIP or Voice over Internet Protocol VoIP or Voice over IP is a technology that helps a group of people to deliver voice and multimedia based communication over IP based networks like Internet. It is also called IP telephony. It supports services like voice communication, SMS, fax etc. over the Internet unlike traditional telephony system, it does not use circuit switching. Rather internet telephony or VoIP uses packet switching networks and packetization of data. An example of VoIP is Skype. (Porter, 2006) There are underlying technologies like session control, signaling control, setting up the call, tearing down the call etc. There are special medial delivery protocols to encode audio, video etc. as digital and streaming data. VoIP can be used by computers, laptops, smart phones etc. SMS service is available over WiFi or 3G connections. (Goode, 2002) Quality of Service or QoS of VoIP has several issues. VoIP is implemented over the Ip networks. IP networks are best effort networks and there may be loss of data, untimely deliver, latency related problem etc. VoIP will use time sensitive communication data. There is no provision of identifying and handling time sensitive data. Network traffic is handled by a first come first serve basis. There is no way to control fixed delays etc. The end points of a VoIP communication path may have to wait for the completion of the transmission of packets from one end to other, then one end will be able to send more data. Security is another consideration of VoIP. There are risks of DoS attacks, stealing of information, eavesdropping etc. There are other technical consideration related to security. For example, VoIP traffic also passes through the firewalls, NATs etc. so, there are chances that communication may get blocked. Encryption is always not supported by VoIP. (Wallingford, 2005) Some of the security measurements and protocols available for the VoIP are, SRTP or Secure Real time Transport Protocol. Also there are implementation of IPSec for the point to point communications. Mobile Internet Protocol MIP or Mobile IP is based on the idea of mobile computing and mobility of devices in a network. It helps a mobile device to keep its IP address same while moving around networks. A mobile node is allowed to have two types of address a care of address and a home address. The care of address changes whenever it moves to some other network, on the other hand the home address is remained same. Thus the computing activities based on the IP addresses are not hampered even there is a change in the network. (Raab, 2007) There are several security and QoS considerations. Most of the times mobile nodes use wireless connectivity options. These links are highly susceptible to vulnerabilities and information security risks. The risks may be active replay attacks, eavesdropping etc. These vulnerabilities cannot be eliminated. But use of encryption etc. can help. Tunneling used in MIP has some serious vulnerability. Thus authentication is always needed here. It also used ARP in case of tunneling. But it is hard to implement authentication for ARP. Thus, there will be some inherent vulnerability. (James, 2008) Conclusion In this report VoIP and MIP has been discussed. There is discussion on what are VoIP, MIP along with security, QoS issues and how enterprise networks are using those. References Ahmed, A., Madani, H., Siddiqui, T. (2010). VoIP Performance Management and Optimization. Cisco Press. Ahson, S. A., Ilyas, M. (2008). VoIP Handbook. CRC Press. Alani, M. M. (2014). Guide to OSI and TCP/IP Models. Springer. Blank, A. G. (2006). TCP/IP Foundations. 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Norris, M. (2001). Mobile IP Technology for M-business. Artech House. Perkins, C. E. (2005). Mobile IP. Pearson . Porter, T. (2006). Practical VoIP Security. Syngress. Raab, S. (2007). Mobile Ip Technology And Applications. Pearson . Raicu, I., Zeadally, S. (2003). Evaluating IPv4 to IPv6 Transition Mechanisms. IEEE. Reynders, D., Wright, E. (2003). Practical TCP/IP and Ethernet Networking. Newnes. Thermos, P., Takanen, A. (2007). Securing VoIP Networks. Pearson . Wallingford, T. (2005). Switching to VoIP. O'Reilly Media, Inc.