The OSI model Essay Example for Free

The OSI model Essay Question: Write a 2-3 page paper describing the OSI model and how it relates to a network. Your response should include answers to the following: †¢ On which layers of the OSI model do WAN protocols operate? †¢ What are some of these protocols? †¢ On which OSI layers do switches and routers operate? †¢ If routers reside at more than one layer, what is the difference between the OSI layers? Introduction: The OSI model was introduced in 1984. Although it was designed to be an abstract model, the OSI model remains a practical framework for todays key network technologies like Ethernet and protocols like IP. The OSI model defines internetworking in terms of a vertical stack of seven layers. The upper layers of the OSI model represent software that implements network services like encryption and connection management. The lower layers of the OSI model implement more primitive, hardware-oriented functions like routing, addressing, and flow control. In the OSI model, data communication starts with the top layer at the sending side, travels down the OSI model stack to the bottom layer, then traverses the network connection to the bottom layer on the receiving side, and up its OSI model stack. How OSI model relates to a network: Information being transferred from a software application in one computer system to a software application in another must pass through the OSI layers. For example, if a software application in System A has information to transmit to a software application in System B, the application program  in System A will pass its information to the application layer (Layer 7) of System A. The application layer then passes the information to the presentation layer (Layer 6), which relays the data to the session layer (Layer 5), and so on down to the physical layer (Layer 1). At the physical layer, the information is placed on the physical network medium and is sent across the medium to System B. The physical layer of System B removes the information from the physical medium, and then its physical layer passes the information up to the data link layer (Layer 2), which passes it to the network layer (Layer 3), and so on, until it reaches the application layer (Layer 7) of System B. Finally, the application layer of System B passes the information to the recipient application program to complete the communication process. Interaction Between OSI Model Layers A given layer in the OSI model generally communicates with three other OSI layers: the layer directly above it, the layer directly below it, and its peer layer in other networked computer systems. The data link layer in System A, for example, communicates with the network layer of System A, the physical layer of System A, and the data link layer in System B. The following figure illustrates this example. Figure : OSI Model Layers Communicate with Other Layers On which layers of the OSI model do WAN protocols operate? A WAN protocols is a data communication protocols which is use in the data communications network that covers a relatively broad geographic area and that often uses transmission facilities provided by common carriers, such as telephone companies. WAN Protocol in WAN technologies, generally function at the lower three layers of the OSI reference model which layers are as following: †¢ Physical layer †¢ Data link layer, and †¢ Network layer. Following figure illustrates the relationship between the common WAN technologies and the OSI model. Figure : OSI Model Layers and WAN Technology specification What are some of these protocols? some protocols which are also operated in the WAN technology are PPP, X.25 etc. On which OSI layers do switches and routers operate? The Network Layer of the OSI model is responsible for establishing paths for data transfer through the network and router are the devices which are used to establishes the path for data transfer. So, routers operate at the Network Layer. And Data Link Layer of the OSI model is responsible for communications between adjacent network nodes. Hubs and switches operate at the Data Link Layer. If routers reside at more than one layer, what is the difference between the OSI layers? Routers generally do not reside at more than one layer, because the router devices are operated in the network layer and they can apply the data link headers when they switch the packet interface and put the signals at the physical layer wires . In this way the routers do work on three different levels, but each job is separate and distinct per layer.

Adolescence: Stress, Depression, and Suicide Essay -- Adolescent Behavi

Adolescence is a stage of maturation between childhood and adulthood that denotes the period from the beginning of puberty to maturity. However, many conflicting opinions are raised about weather such a stage of childhood is influenced by stress, depression, and suicide rate. Some people support the optimistic view that says that adolescence is not a period of storm and stress. Others, including me, support an opposite pessimistic view which characterizes adolescence as a period of stress and inner turmoil. Unfortunately, it has been recently proved that depression is a growing problem in today's society and a major contributing factor for a multitude of adolescent problems. This is because , as research indicates, adolescent depression is the result of mood disorders accompanying this period and the high suicide rate that is basically a result of such a depression. By analyzing depression, we will find that depression is a disease that afflicts the human psyche in such a way that the afflicted tends to act and react abnormally toward others and himself. Therefore it comes to no surprise to discover that adolescent depression is strongly linked to teen suicide. Adolescent suicide is now responsible for more deaths in youths aged 15 to 19 than cardiovascular disease or cancer (Blackman, 1995). Despite this increased suicide rate, depression in this age group is greatly underdiagnosed and leads to serious difficulties in school, work and personal adjustment which may often continue into adulthood. However, how prevalent are mood disorders in children and when should an adolescent with changes in mood be considered clinically depressed? Brown (1996) has said the reason why depression is often over looked in children and adolescents is because "children are not always able to express how they feel." Sometimes the symptoms of mood disorders take on different forms in children than in adults. Adolescence is a time of emotional turmoil, mood swings, gloomy thoughts, and heightened sensitivity. It is a time of rebellion and experimentation. Blackman (1996) observed that the "challenge is to identify depressive symptomatology which may be superimposed on the backdrop of a more transient, but expected, developmental storm." Therefore, diagnosis should not lay only in the physician's hands but be associated with parents, teachers and anyone who ... ...that lie in their paths, there are some who find themselves overwhelmed and full of stress. How can parents and friends help out these troubled teens? And what can these teens do about their constant and intense sad moods? With the help of teachers, school counselors, mental health professionals, parents, and other caring adults, the severity of a teen's depression can not only be accurately evaluated, but plans can be made to improve his or her well-being and ability to fully engage life. WORKS CITED Blackman, M. (1995, May). You asked about... adolescent depression. The Canadian Journal of CME [Internet]. Available HTTP: http://www.mentalhealth.com/mag1/p51-dp01.html. Brown, A. (1996, Winter). Mood disorders in children and adolescents. NARSAD Research Newsletter [Internet]. Available HTTP: http://www.mhsource.com/advocacy/narsad/childmood.html. Lasko, D.S., et al. (1996). Adolescent depressed mood and parental unhappiness. Adolescence, 31 (121), 49-57. Oster, G. D., & Montgomery, S. S. (1996). Moody or depressed: The masks of teenage depression. Self Help & Psychology [Internet]. Available HTTP: http://www.cybertowers.com/selfhelp/articles/cf/moodepre.html

Hamlet Essay †Misogyny Essay

Misogyny, by definition, is the hatred of women and girls. In Hamlet by William Shakespeare, misogyny affects women in negative ways that both impact how a woman is portrayed along with how these stereotypes and controls influence her actions and ultimately lead to her demise. Gertrude and Ophelia, the only major female characters of this play, are both women who must confront various factors and adverse effects of misogyny. Shakespeare uses the patriarchal system to suggest the effects of men’s misogynistic behavior towards women. The patriarchal system allows men to objectify women by using them as pawns, and gives men the power to control and manipulate women as they please. Shakespeare demonstrates this through the words and actions of Polonius, Ophelia’s father. Firstly, the patriarchal system gives Polonius the power to treat Ophelia like an object and control her actions. Claudius, Gertrude, and Polonius all come together in this scene to make a plan on how to di scover why Hamlet has gone so mad. In their conversation, Polonius says, â€Å"At such a time I’ll loose my daughter to him.† (II.ii.174) Here, the word â€Å"loose† emphasizes the cynical unconcern that he has for his daughter. The use of â€Å"loose† in this context is also a pun. Loose means cow, so Shakespeare uses this line as a metaphor to say that Polonius is soon going to â€Å"loose† his daughter, a cow, to a bull, who is none other than Hamlet. Polonius does this again while talking to Ophelia about how she shouldn’t believe Hamlet’s words or rely on any of his promises because according to Polonius, Hamlet doesn’t truly love Ophelia; he simply has a strong lust for her at the moment. â€Å" Ay, springes to catch woodcocks. I do know, / When the blood burns, how prodigal the soul/ Lends the tongue vows,† Polonius explains. (I.ii.120) Shakespeare uses diction here to emphasize what Polonius thinks of his daughter. â€Å"Springes† are snares to catch fools and a â€Å"woodcock† is a bird that is easily taken. In simple terms, Polonius is comparing Ophelia to this foolish type of bird, saying that she is easy to get and fool. Once again, he compa res her to an animal – objectifying her and bringing her down from her status as a human and woman in society. Shakespeare demonstrates how sexuality is portrayed as something crude and wrong through the actions of Queen Gertrude. Hamlet’s aversion towards his mother’s sexuality upkeeps the idea that sexuality is obscene. Hamlet is absolutely disgusted by his mother and while talking to himself, exclaims: â€Å"O, most wicked speed, to post/ With such dexterity to  incestuous sheets!† (I.ii.158-159) Gertrude’s sexuality makes her inappropriate because she remarried with â€Å"wicked speed.† The word â€Å"wicked† has a negative connotation to it. It implies that Gertrude’s speed in remarrying was bad and evil because she betrayed King Hamlet so quickly and the quickness of her actions makes her seem sexually vulgar. Hamlet is disgusted by the fact that his mother was both quick and agile with becoming incestuous. Furthermore, the idea that sexuality is vulgar is further demonstrated when the ghost of King Hamlet reveals his disgust towards Gertrude’s incest. â€Å"So lust, through to a radiant angel linked, / will state itself in a celestial bed/ And prey on garbage.† (I.v.59-60) Even though sexuality can be pure like a â€Å"radiant angel,† it will glut (â€Å"sate†) and â€Å"prey on garbage.† Shakespeare uses imagery with these words to reveal that Gertrude is garbage and that she is searched for like junk by a scavenger. The word â€Å"sate† shows Gertrude as a gluttonous animal, implying that her sexuality makes her an animal; thus sexuality is vulgar. Shakespeare emphasizes that virginity is essential to a women’s value in society, for it makes her both pure and desirable. Ophelia’s conversations with her brother Laertes and her father Polonius provide evidence that both Laertes and Polonius place a very high value of Ophelia’s sexuality and her obligation to protect her virginity. Laertes and Ophelia have one last conversation before he departs to France. He gives her advice about rejecting lust and desire in order to keep her virginity and thereby make herself honorable. In their conversation with each other, Laertes warns Ophelia to not let herself be seduced and lose her honor by losing her virginity. He says, â€Å"The canker galls the infants of the spring/ Too oft before their buttons be disclosed.† (I.ii.42-43) Shakespeare uses some interesting metaphors in this scene to stress the value of Ophelia’s maidenhood by comparing it to a flower. The phrase â€Å"infants of the spring† im plies both innocence and fertility. This metaphor compares women, in this case Ophelia; to new spring flowers whose buds still haven’t been opened (still virgins). Laertes is saying that Ophelia is still young so she must resist her desires in order to save her virginity; doing so would also save her honor, which is something that is very valued especially for women in society. Polonius also warns Ophelia about the value of her virginity, but  for other reasons. Unlike Laertes, who is more concerned about Ophelia’s happiness and emotional well-being, Polonius is more focused on himself and the respect of his family. He says to her: â€Å"You do not understand yourself so clearly/ As it behooves my daughter and your honor.† (I.ii.102-103) Here, Polonius is saying that Ophelia does not yet understand how to behave in a way that is suitable for someone who is his daughter and who is under his name and household. He is afraid that if Ophelia loses her virginity, she will disgrace the family and hurt his reputation; all in all, he fears that the respect of his family will be damaged. This makes it evident that Shakespeare believed th at along with altering a woman’s reputation and social standing, women’s chastity also affected men’s social standing in society. Seeing that virginity is given such high value, Shakespeare also clearly demonstrates the consequences that a woman experiences by losing her virginity before marriage. He uses Ophelia’s character to illustrate how losing a woman’s virginity causes her to lose relationships with people she loves, her social status and reputation, her sanity, and ultimately, her life. OPHELIA. By Gis and by Saint Charity, Alack, and fie, for shame! Young men will do ’t, if they come to ’t. By Cock, they are to blame. Quoth she, â€Å"Before you tumbled me, You promised me to wed.† He answers: â€Å"So would I ’a’ done, by yonder sun, An thou hadst not come to my bed.† (IV.v.59-67) After losing her father, Ophelia has become insane and is singing this song while reminiscing about the love that she and Hamlet once had. She has been driven to this madness because of her instability after her father is killed and Hamlet leaves her. Slowly everyone she loves is drifting away and she feels that is because she didn’t listen to her father and brother about protecting her virginity before, so now she is suffering the consequences.  In this scene, she is specifically singing about how Hamlet did not keep his promise of marrying her after they had slept together. â€Å"Young men will do’t if they come to’t,/ By cock, they are to blame,† she explains. In other words, she is saying that men will have sex whenever they have the opportunity. With the phrase â€Å"by cock, they are to blame,† she is saying that the â€Å"cock† represents the vulgar corruption of God because they are the ones who take a woman’s virginity. Furt hermore, Hamlet does not want to marry Ophelia anymore because she isn’t a virgin and all men want to marry a woman who is pure and untouched. Ophelia’s madness in this scene expresses how losing her virginity led her to insanity because she was incapable of dealing with losing all of her loved ones. Additionally, she loses any respect that she had, along with her social status, because she has done something that is completely unacceptable for a young woman to do in such a society in that time. All of this ultimately causes Ophelia to take her own life as a way to end the chain reactions of heartbreak and misery that she has had to experience, all because she decided to go and lose her virginity to Hamlet. In conclusion, Shakespeare uses the patriarchal system to suggest men’s ability to manipulate women, and ultimately gives an explanation of the reactions to men’s misogynistic behavior towards women. Common stereotypes of women gravely impact women’s perception of themselves and shape women to fit under certain archetypes in a patriarch-run society. Misogyny destructively affects the fate of â€Å"Woman† and, slowly but surely, leads to the deterioration of her idea of self and identity.

High Teen Pregnancy Rate Comprehensive Sex Education at...

In May 2006 the silence cries of Kaylib Neal began to fill the delivery room as young Kizzy Neal slightly tilts her head with the energy she has left to take a glace at her new son. Although this moment is one of the happiest times of Kizzys life, she still wishes she could have waited to experience this moment at a later time in her life. At the age of only thirteen, Kizzy is one among the thousands of teenage girls who become pregnant each year in the United States. According to The National Campaign to Prevent Teen Pregnancy, 34% percent of young women become pregnant at least once before they reach the age of 20. Eight in ten of these teen pregnancies are unintended and 79% are to unmarried teens. There are many preliminary causes†¦show more content†¦Based on a Washington post titled Sex Ed Can Help Prevent Teen Pregnancy, Teens who have received comprehensive sex education classes are 60% less likely to get pregnant than those with no sex education classes. Schools t hat provide these comprehensive sex education courses see a more positive outcome in their students. However, just because teens are attaining information on this subject does not mean they are being taught effectively. Other schools who teach a different type of sex education class known as â€Å"abstinent† do not see the same results. The difference between comprehensive and abstinent classes is quite simple; comprehensive teaches its students about sex and how to take the proper precautions and abstinent teaches its students that they must refrain from sexual activity altogether. In 2006, 87% of U.S. public and private high schools taught abstinence as the most effective method to avoid pregnancy (Facts on American Teens†). Although the schools may think of it as the most effective method, their students have said otherwise. For example, when interviewing Sarah Palins daughter, Bristol Palin, she gave her views on how taking abstinent classes did not provide her with enough information. Many students such as Bristol who take abstinence classes are not taught aspects of sexual activity that they may need in case they decide to goShow MoreRelatedThe Issue Of Sex Education1613 Words   |  7 PagesWhen hearing the term â€Å"sex education,† most will immediately think of â€Å"the talk† that parents have with children. â€Å"The talk,† a phrase widely used through everyday life, movies, television, etc. is intended by parents to inform their children of the consequences of unsafe sex and to explain how babies are made. Despite being a necessary conversation at home, this â€Å"talk† is generally vague and uninformative in comparison to classes on the subject. However, this topic causes chaos when dealing withRead MoreHiv And Its Effects On The United States1440 Words   |  6 Pagespeople under the age of 25 (Starkman, Rajani). It’s estimated that by the end of high school, nearly two thirds of American’ s youth are sexually active, and one in five has had four or more sexual partners (Starkman, Rajani). Despite these alarming statistics, less than half of all public schools in the United States offer information on how to obtain contraceptives and most schools teach abstinence only education (Starkman, Rajani). Even more alarmingly there is little evidence that abstinenceRead MoreThe Age Of The Pill1530 Words   |  7 Pagesthe 20th Century, teen pregnancy was the norm. The prevention of unintended adolescent pregnancy has become an important goal of our society. Although adolescent pregnancy and birth rates have been steadily decreasing, many adolescents still become pregnant. The purpose of this research paper is to review the history, current status, programs and the future of teen pregnancy. History In the early 20th Century, teen pregnancy was the norm. Women were lucky to get an education past the eighth gradeRead MoreThe Importance of Sex Education1217 Words   |  5 PagesWith sex being a sensitive subject for parents to discuss with their children, they believe it is not appropriate to discuss these types of delicate subjects at any age. It is not because they don’t want to inform them, but because they want to protect them. Even though they don’t know that be keeping it from them, their children are far from safety every day. However, with today’s high birth rates at early ages, the question is no longer â€Å"should sex education be taught?† but â€Å"how sex education shouldRead MoreTeen Pregnancy Essay1314 Words   |  6 Pages(Hamilton, B.E.). That’s nearly 750,000 teen pregnancies every year. According to, â€Å"11 facts about teen pregnancy† less than 2% of teen moms earn a college degree by age 30 (Par. 2 5). There are many reasons for this and the best way to help limit teen pregnancy would be to require parents to attend teen pregnancy prevention meetings held by schools. One of the many problems is that most teens are not well informed about the troubles of being a teen parent. They don’t understand how it willRead More Abstinence Only Sex Education Essays2119 Words   |  9 Pagesthe first world would one expect the teen pregnancy rate to be the highest? Surprisingly, it is the United States that has the highest teen pregnancy rate of any first world country, more than double the rate of twenty other first world countries and almost ten times greater than that of Switzerland. While some of the disparity can be attributed to factors such as income inequality, the presence of abstinence only education has a major impact on birth and STD rates in the United States in comparisonRead More Drug Abuse Among American Teenagers Essay7972 Words   |  32 Pagesordinary teenager can have a drug problem depending on there friends, and relationship with there family. These teenagers turn to drugs because they have no where else to turn. There family members arent ever around, or hardly ever around. Some teens may have there parents around, but they too are involved with drug abuse, giving little or no attention to there children. They may have dropped out of school, or arent meeting the standards set for them to meet, giving them a sense that they arentRead More The Fatherhood Movement Essay5325 Words   |  22 Pagesimplemented in many states, encouraged courts to place young children with mothers because mothers were seen as essential to emotional development. The maternal preference continued to increase throughout the 1950s and 60s. With the spread of no-fault divorce laws throughout the late 1970s, and the increase of womens participation in the work force, women were more able to obtain divorces from unhappy marriages. Maternal preference in custody battles gave women a huge advantage, and a vast majorityRead MoreBusiness Journalism in Ind ia26104 Words   |  105 PagesCurrency * Commodity The movement in the above mentioned segments and the reasons for the same, make for a story. * Unorgranised and Organised sector. * Business Media * The business media focus on stock prices, growth rates, market shares, bottom lines and such. * For a complete story one should look at what fundamentally influences the other. E.g Tata Nano * Its complicated but interesting. * Business journalism is a big, broad multifaceted thing. ThereRead MoreFundamentals of Hrm263904 Words   |  1056 PagesRecruiting 132 Foundations of Selection 154 PART 4 Chapter 8 Chapter 9 TRAINING AND DEVELOPMENT Socializing, Orienting, and Developing Employees 182 Managing Careers 208 PART 5 Chapter 10 Chapter 11 Chapter 12 Chapter 13 MAINTAINING HIGH PERFORMANCE Establishing the Performance Management System 230 Establishing Rewards and Pay Plans 260 Employee Benefits 286 Ensuring a Safe and Healthy Work Environment 312 PART 6 Chapter 14 LABOR–MANAGEMENT ENVIRONMENTS Understanding Labor