Organizational Behavior Assignment Example | Topics and Well Written Essays - 2000 words

Organizational Behavior - Assignment Example The researcher states that job satisfaction or dissatisfaction can be one of the most uplifting or damning things for an organization and its management to ponder. It directly affects the morale of the workers and contributes to the success or failure of the enterprise to achieve its goals. Herzberg found that there were two sets of factors that impacted on the job satisfaction level of employees. He called the positive ones Motivation factors and the negative ones Hygiene factors. In the job as a clerk at a University, the researcher has found that a clerk often complains of the low salary and restrictive and archaic company policies. However a clerk has taken this job just to support his studies at the University. At the same time it helps him understand how the University is run. On the other hand, he has a good working relationship with his boss as well as his peers, which helps her survive and look forward to the next working day. For the researcher, he plans to take a more care er oriented job, and would like to be challenged by exciting work assignments, with a sense of achievement and opportunities for further advancement and growth into a responsible managerial position. The researcher would also like to be remunerated well for my efforts because he believes that money is a great motivator and can help one get many comforts in life. But he would also agree that in any organization, there must be enough incentives to let the employees do the work in peace and quiet and be properly appraised for it, so that they see that their effort is being recognized. 2. Take the short personality inventory related to the Myers-Briggs Type Indicator. The MBTI is the most popular psychological assessment tool for employee development. http://www.personalitytype.com/career_quiz Tell us your profile and whether or not it reflects what you know to be true about your personality. After taking the MBTI test, I have been typeset as INTJ or Introvert, Intuitive, Thinker, Judge r. This reflects about 2 to 4 percent of the U.S population. I find this assessment to be quite a faithful and correct representation of my character or personality. I am quite shy around people and do not automatically want to hug the limelight. I prefer to let my deeds speak for themselves. I also am a quiet sort of person and have trouble starting conversations with strangers, usually of the opposite sex. I usually start conversations by getting to the point after exchanging pleasantries and would find it difficult to make small talk just to pass the time. I am known to be direct but considerate at the same time. I like to judge situations and events and would be the first to point out mistakes and errors. I do not mean to be critical but it is really a natural trait. I would have trouble praising myself and am rather appalled at the way some other people readily praise themselves and picture themselves to be the heroes or people most sought after in every situation. It is as if the world would come to a stop without their presence. That said, I am quite confident and self assured in what I do and think. I think that I know what I am worth without any airs and pretensions. I believe that I should be rewarded for my contributions and hard work and would be upset if these were overlooked. I think that this sums up my personality quite well 3. Look at the Rokeach instrumental and terminal values in Exhibit 5-3 on page 147 of the text. According to your own personal values, rank the list from 1-18 with #1 being the most important to you and # 18 being the least. List your responses in order and tell us what insights you gained from this exercise. TERMINAL VALUES 1. A Comfortable Life 2. A World at Peace 3. A World of Beauty 4. A Sense of Accomplishment 5. An

What is the College Essay Topic For the Southeast?

What is the College Essay Topic For the Southeast?If you have applied to a school on the Southeast, you are not alone. Thousands of applicants are applying for every college in this region because the job market is so good.An entire industry has sprung up around the college in Texas. So, how do you stand out? How do you differentiate yourself from the competition?The first thing you must decide is what type of topic you want to write about. Is it purely academic? Or, maybe it is a more personal story that discusses your experiences as a student? Regardless of your theme, you must set some goals in mind for yourself when looking at this issue.So, how should you answer such questions? Well, the best approach to answer these questions is to research your area and decide what you would like to accomplish as a student. As a college student, you will be asked many types of essays, so you will need to be prepared.When you research college essay topics in your area, ask yourself what you are specifically looking for. Does it fall into one of the categories listed above? By answering this question, you will be well on your way to finding what it is you need to write about.Many people think that they can just choose any topic and be all set. This does not work in college. You must be prepared, and this means that you need to decide what you want to say about your area and what you want to say about yourself.By asking yourself these questions, you will know what you should write about and who it is that you are trying to write for. By knowing the subject, you will also be able to know what type of writing you will be required to do.

Top Secret Facts About Does Writing an Essay Increase My Chances of Getting into a College Uncovered by the Experts

Top Secret Facts About Does Writing an Essay Increase My Chances of Getting into a College Uncovered by the Experts There are things you can do in order to boost your chances significantly. The tips below not only can help you land that spot at your fantasy school but in addition offer you useful tools for your upcoming college classes. Remain in contact with your admissions counselor. Plenty of things in life can and ought to be recycled. Does Writing an Essay Increase My Chances of Getting into a College Can Be Fun for Everyone Besides focusing on your grades, you still must figure out ways to devote your time beyond classwork and homework effectively. All you will need is good writing help given by qualified and expert professionals. There are a couple of steps a student can take to improve their chances at getting into a college of choice. Still, as soon as a specialist within the field manages editing of your essay, research or term papers, you've a lot more chances to find an extremely good grade. The Secret to Does Writing an Essay Increase My Chances of Getting into a College With our college entry essay, you are going to have more chances to turn into a student of a college you've chosen. Keep in mind, you have to stick out on your college admissions essays. It can be hard to locate specific details about a college's waitlist. The trick to convincing the admissions officers is in understanding what they want to find. A A may be the top grade. If your classwork already proves that you're studious and determined (because you've taken a wide selection of advanced classes), then you might want to highlight another feature of your personality. It's also hard to get right. Somebody's life chances will frequently be dependent on their social class inside their society. 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The Secrets of Busi 620 Research Paper Topics Revealed

The Secrets of Busi 620 Research Paper Topics Revealed The results of a purchases paper on the internet can demonstrate the importance of relying on experts for such support. As an example, in the instance of the effect of minimum wages, the idea tells one how minimum wages and employment could possibly be connected, and the reason why they are connected. You're lucky if you're given one or can select from the list, but usually you get into sink or swim situation when you need to get a subject for your research all on your own. Research is a fundamental portion of virtually every profession. You can both utilize personal experience and cover new nuances for you, depending on the research of different authors and drawing your own personal conclusions. If inherent doubts trouble the student at the start, approaching the instructor before the actual work begins is a really very good idea. 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Criminal Justice Trends Essay Example | Topics and Well Written Essays - 1250 words

Criminal Justice Trends - Essay Example In the case of Arab-American communities right after the September 11 terrorist attack, one substantial implications of such incident led to understanding how the US law would treat the Arab-American communities especially within the context of US legal system. There were four important barriers to effective law enforcement, which were found to obstruct good relationship between US law enforcement and Arab-American community: distrust between Arab-American community and law enforcement, deficient cultural awareness, difficulty in language, and prevailing concerns regarding immigration status and deportation (Victor & Naughton, 2010). Robinson (2009) argues that there is no such thing as existence of criminal justice in the US due to inefficient, uncoordinated and lack of harmonious consensus effort among criminal justice agencies. Nonetheless, Robinson points out that there are prevailing efforts in the justice system to emancipate justice and ensure reduction of crime. However, base d on his arguments on this issue, it seems the US criminal justice system lacks grandeur especially in the achievement of its goals. The proof of this is tantamount to Robinson’s suggestion for alternative goals for the criminal justice system and one of them would be meeting limited interests through placing certain population segments under control. Furthermore, Robinson adds to his argument that the law in the US does not actually represent all Americans. One of his major point is this, legislators at the federal and state level could not actually stand as representative of Americans from the point of view of demographic terms. Second, at some point one could not consider voters to be representative of Americans by looking at it from demographic terms. Finally, he shows evidence that most people do not actually vote. Another argument he specifically points out just to argue that no such thing as criminal justice exists in the US is relevant to the invention of law itself. He argues that crimes do not exist not until they are invented by law makers. This means that there are still certain crimes that could exist without corresponding action from the criminal judicial system due lack of detailed law regarding them. One specific example of this is the continuing subjective concerns underlying organized crimes. Another point is the varying legal policies for certain crimes from state to state or based on demographic terms. Robinson also adds in his argument that there exists an undermining of due process values due to excessive support for crime control values. He cites the very case how the media stereotype crimes and criminal justice. His proof is the focus media have on most violent and random types of crimes in the US. Robinson also points out that police tend to be more biased against poor people and people of color. Robinson calls this as innocent bias. Robinson also presents statistical evidence showing that the plea dispersal could reach more tha n 90 percent of felony crimes, implying further that one could less likely expect a reasonable criminal trial in the US. Furthermore, Robinson includes the idea that one could actually associate

The Study Of Motivation In Sport Physical Education Essay

The Study Of Motivation In Sport Physical Education Essay This reviewed research is on motivation in sport. A variety of definitions and approaches to the study motivation will be discussed. One of the forms of motivation being discussed will be intrinsic and extrinsic motivation. Intrinsic motivations are very important for promoting satisfaction and long term participation in sport. There are three theoretical approaches to the study of intrinsic motivation: behavioral, cognitive, and motivational. Researchers have found that the intrinsic motivation of athletes seems extremely important for long-term involvement, and fine-tuned performance in sport. Extrinsic motivation refers to motivation that comes from outside an individual. The motivating factors are external, or outside, rewards such as money or grades. These rewards provide satisfaction and pleasure that the task itself may not provide. Another form of motivation has to do with gender. Researches have determined that there are motivational differences among male and female sports. Its also been determined that male and female athletes possess different strengths and weaknesses within the motivational climate. Some detailed differences stated were that men had higher levels of motivation in competition, social acknowledgment, strength and endurance, where women had stronger motivation to control weight. The last factor I will cover is cultural effect on motivation. Introduction to your Research Topic Deci, et al. (1999) state that intrinsic motivation can also be enhanced by increasing an individuals perceptions of autonomy and competence. Deci, et al. (1999) also showed that research supported the idea that extrinsic motivations impact on intrinsic motivation was influenced by the controlling nature of those extrinsic rewards. For instance, positive feedback that is not considered controlling would likely add to an individuals perceived competence and have a positive effect on their intrinsic motivation. Vallerand (2000) looks at motivation in a multidimensional manner that encompasses more than the dichotomy of intrinsic and extrinsic motivation. He states that motivation for both is on a continuum that ranges from a high to low level of determination and that operates on three distinct levels: global (ones overall general motivation), contextual (in a specific domain or field such as education or sports), and situational (the here and now). At each of these levels individuals can have different motivation levels (both intrinsic and extrinsic). For example, one could be highly intrinsically motivated to participate in sports, but less intrinsically motivated regarding education (contextual). However, if a person is feeling ill or tired, they may not have the same intrinsic motivation to participate in sports activities that day (situational). Extrinsic rewards could be applied to both and impact situational motivation in both the short and long term. For example, that individual might be highly motivated to do well on a test and receive a good grade (extrinsic motivation) so that they can be eligible to play on their sports team (intrinsic motivation). Vallerand (2000) postulates that repeated levels of low levels of situational intrinsic motivation will likely have a diminishing effect on the larger contextual intrinsic motivation. He highlights research done on motivation to play basketball where intrinsic motivational levels were affected by situational motivational levels during tournament games. This research has many implications for organizations and educational situations. While understanding that extrinsic motivation is one of the main drivers of the business world, compensation and other incentive packages need to address their impact on intrinsic motivation and be developed in ways that will reduce the adverse affects or possibly even add to the intrinsic motivational levels. More research on real life situations would be beneficial. Background of the Research Topic Motivation in sports and exercise has been studied over the last century but only in recent decades has motivation by gender been analyzed. studies in the area of motivation by gender in these sports and exercise fields: individual and team sports and exercise, martial arts, basketball, volleyball, track and field, and general sports participation and exercise (Kilpatrick, Hebert, Bartholomew, 2005). These results were the most consistent throughout the reports with other similarities and differences noted with each study. Intrinsic and extrinsic motivation are both adaptable and change in response to specific situations and life occurrences. While not easy to define, intrinsic motivation can be described as an internal drive to perform an activity. While extrinsic motivation is ascribed to an external motivating source that drives action. It is postulated that people attribute their behavior either to an internal or external source. Intrinsic motivation correlates positively to when people attribute their motivation to internal sources, while extrinsic motivation is correlated to belief in an external source for their behavior (Wiersma, U. J., 1992). Extrinsic motivation, by definition, is changeable since it is an external motivator one can change the reward or external source (i.e. amount of money offered to do a job, feedback on performance, etc.). Meta-analysis of intrinsic and extrinsic motivational research by Deci, Koestner and Ryan (1999) found that intrinsic motivation is negatively affected when tangible extrinsic motivation is attached to the behavior. This undermining of intrinsic motivation is postulated to be the result of a perceived decrease in autonomy and competency by the individual receiving the extrinsic reward. Self-determination Theory states that humans have three inherent needs: autonomy, competence, and relatedness. Of these, autonomy and competence are the main drivers of intrinsic motivation (Franken, 2002). Thus we see that intrinsic motivation can be changed by adding an extrinsic motivating component. Motivation is a crucial factor within the sport and exercise field. Understanding what and how motivation works is equally important. Based on these reviews gender also plays a role within the motivational climate. Studies have revealed variations in motivational factors within each gender. In Chie-der, Chen, Hung-yu, and Li-Kangs journal 87 male and 87 female basketball players from the HBL were selected for the research. Four research questionnaires were used to measure four phenomena: participants goal orientation, the motivational climate they perceived, perceived personal athletic ability, perceived personal sport-related confidence (Chie-der, Chen, Hung-yu, Li-Kang,2003). Using a t test gender differences were detected. Males tended to record higher scores than females for sports related confidence variables. Males scored higher within ego orientation, perceived ability, and in physical performance. Females tended to score higher in task orientation, perceived task climate, and leadership styles (Chie-der, Chen, Hung-yu, Li-Kang,2003).   Numerous studies have examined the question of whether there are differences in youth motives across sports, age, gender, and culture and suggest that children or adolescents are subject to the environmental influences in their motivation to participate in certain physical activities. Thus, investigating the diversities in motivation of participation may shed light on the underlying reasons of why children or adolescents take part in various forms of physical activity or sports. Impact on sports Gender: In Kilpatrick, Hebert, Bartholomews study 233 students were studied, 132 women, 101 men. The purpose behind this study was to compare sports participation and exercise motivation through a highly differentiated scale of physical activity. The second objective was to investigate the impact of gender on motivation. This study determined that men were more highly motivated then women when it came to endurance and strength, social recognition, challenge, and most notably competition, where women were more motivated by weight management (Kilpatrick, Hebert, Bartholomew, 2005). It was further suggested in this analysis that motivations to engage in sports differed from motivators to engage in exercise. It was also noted that more of the health related motives were linked to exercise opposed to sports participation thus indicating that sports participation are more closely related to intrinsic motives. It was suggested that based on these findings that men leaned more closely to intrinsic m otivation then women. This study further implied that men viewed exercise and fitness opportunities as a means to achieve ego related goals that support their sports participation where as women seemed to enjoy exercise and sports participation equally (Kilpatrick, Hebert, Bartholomew, 2005). In Murcia, Gimeno, and Colls study 413 athletes completed a perceived motivational climate in sports questionnaire. The sample was comprised of 322 boys and 91 girls, sports included individual and team sports. This analysis used the MANOVA to analyze the effects of gender, goal orientations, and perception of motivational climate and its flow. The findings showed that males had a stronger ego orientation that more specifically involved punishment for errors then did females. Females were more inclined to identify a motivational climate orientated towards learning (Murcia, Gimeno, and Coll,2008). In Jones, Mackay, and Peters journal 17,463 participants participated in a questionnaire. This analysis differed from the others in this review. It noted no significant gender differences, it also noted that the four most important motivations for both male and females were affiliation, fitness, skill development, and friendship, this opposed to the three least influential motivators which were reward/status, situational, and competition. It also noted that the individuals studied in martial arts were immersed in a holistic approach of the martial art which placed increased value on the underlying philosophy. They further noted that the style of the instructor encompassing teaching/communication style and technical ability is of paramount importance for enhancing student motivation to participate (Jones, Mackay, and Peters, 2006). It is implicated within this research that the similarity in gender motivation may be a result of the philosophies of the teachings. Cultural: cultural differences in psychological meanings for sport have been documented by empirical research. Research in cross-cultural sport psychology, for example, has found group differences in how athletes prioritize achievement motives, team affiliation, and social recognition (e.g., Kolt et.al.; 1999; Rees, Brettschneider, Brandl-Bredenbeck, 1998; Weinberg et.al., 2000). Similarly, a large literature about sport, globalization, and cultural imperialism describes how sport associates with distinct mentalities within particular historical and national contexts (e.g., Guttmann, 1994; MacAloon, 1996; Maguire, 1999; Miller, Lawrence, McKay, Rowe, 2001). findings of previous research Gender In Gillson, Standage, and Skevingtons journal which studied 300 male and 280 female students in their motivation towards exercise. Motivation towards exercise was measured using the behavioral regulation and exercise questionnaire-2. The statistics were calculated separately for males and females, then gender differences were explored using t-tests and x2 tests. Similar to other results in this review weight seemed to be a greater motivation within girls than boys however girls in general were less motivated to exercise then boys. The most common motivation factor for boys were fitness and health and for girls body tone, health, and attractiveness. In this study just like the study of Kilpatrick, Hebert, Bartholomew, 2005 it was determined that girls were reported to exercise more for extrinsic goals then boys, more specifically when it came to weight control (Gillson, Standage, and Skevington, 2006). Cultural: This study derived from participant-observation with the two mens soccer teams, one sponsored by a private Midwestern university in the United States (referred to as UA) and one associated with a government-sponsored university in Malawi in sub-Saharan Africa (referred to as UM). Because the teams were similar in regards to the relative educational and class status of their members, the two groups varied most clearly by cultural context. Qualitative data was obtained from interviews and observations gathered during two years with the UA team and a year with the UM team. The specific procedures are discussed below after providing necessary context by discussing the participants and settings. Conclusions section It is concluded that it is important for coaches, teachers and parents to stress to young athletes the need to improve skills, teamwork and sportsmanship over the win at all costs attitude. terms/concepts Key words: self-determination, goal orientations, motivational climate, perceived competence References page JAM Murcia,(2008) Relationships among Goal Orientations, Motivational Climate and Flow in Adolescent Athletes: Difference by Gender,The Spanish Journal of Psychology, volume 11, number 1, 181-191. Kilpatrick, Hebert, and Bartholomew, (2005) College Students Motivation for Physical Activity: Differentiating Mens and Womens Motives for Sport Participation and Exercise, Journal of American College Health, volume 54, number2 Gareth W. Jones, Ken S. Mackay, and Derek M. Peters, (2006) Participation Motivation in Martial Artists in the West Midlands Region of England, Journal of Sports Science and Medicine CSSI, 28-34 Dongfang Chie-der, Steve Chen, Chou Hung-yu, and Chi Li-Kang, (2003), Gender Differential in the Goal Setting, Motivation, Perceived Ability, and Confidence Sources of Basketball Players, The Sport Journal ISSN 1543-9518 Gillison, Standage, Skevington, (2006), Relationships among adolescents weight perceptions, exercise goals, exercise motivation, quality of life and leisure-time exercise behavior: a self-determination theory approach, Oxford Journals, Vol. 21, no. 6 Deci, E. L., Koestner, R., and Ryan, R. M., (1999). Meta-analytic review of experiments examining the effects of extrinsic reward and intrinsic motivation. Psychological Bulletin (125). Retrieved on August 21, 2003 from EBSCOhost. Franken, R. E., (2002). Human Motivation. Wadsworth, Belmont, CA. Vallerand, R. J., (2000). Deci and Ryans Self-Determination Theory: A view from the Hierarchical Model of intrinsic and extrinsic motivation. Wiersma, U. J., (1992). The effects of extrinsic rewards in intrinsic motivation: A meta-analysis. Journal of Occupational and Organizational Psychology (65). Retrieved on August 21, 2003 from EBSCOhost.

Computer Networks Essay

I. Internet and layered protocol architecture: Q1. (5 points) In the layered protocol architecture the transport layer functionality includes congestion control and error recovery (e.g., retransmission). One suggested that this functionality should be done strictly at the end points (i.e., at the hosts) without aid from the network. Do you agree? Why? Elaborate showing the design trade-offs. Answer: (5 points) In general, error recovery (e.g., re-transmission) is specific to application needs. Some applications require 100% packet recovery, even with delays and jitters (such as TCP-based applications, http, ftp and telnet traffic). Other applications may be tolerant to loss but less tolerant to delays and jitter, such as voice applications. Re-transmissions and packet recovery add to the jitters and the delays and hence may not be desirable for realtime or voice applications. Hence it is not a good idea, in general, to include error recovery at the network layer (that is not aware of application needs) and it is better to implement such functionality at the transport layer end-to-end. In cases of lossy channels in the network (such as X.25 in the early networking days, or wireless links) it may be desirable to reduce the bit error rates on those links by including error recovery at the end points of those links. [In general, most links nowadays have very low BER, and for wireless links the MAC (such as IEEE 802.11) layer provides Ack’ed delivery]. For congestion control, a similar argument may be given. That is, congestion reaction may be application specific and is better implemented end-to-end. Congestion notification, on the other hand, may provide useful information to the end points to react appropriately. Since losses in the network may be due to congestion or other factors, a signal from the network to the end point may help distinguish congestion errors from other errors. Only congestion errors should trigger ‘back off’ or rate cut at the end points. So, network assistance in congestion notification may help in some scenarios. [extra: In other scenarios network assistance may prevent synchronization effects of congestion control, e.g., RED, or may prevent/isolate misbehavior, e.g., WFQ.]. Q2. (5 points) What advantage does a circuit-switched network have over a packetswitched network? How can it establish such advantage? Answer: A circuit-switched network can guarantee a certain amount of end-to-end bandwidth for the duration of a call. Most packet-switched networks today (including the Internet) cannot make any end-to-end guarantees for bandwidth. Circuit-switched networks use admission control, and reserve a circuit (in TDM it is done in the form of an assigned time slot per source that no other source can use). The allocated resources are never exceeded. Q3. (10 points) What are the advantages and disadvantages of having a layered protocol architecture for the Internet? (mention at least 3 advantages and 2 disadvantages) Answer: Is it true that the change in any of the layers does not affect the other layers? (support your answer/arguments with examples) Advantages: Allows an explicit structure to identify relationships between various pieces of the complex Internet structure, by providing a reference model for discussion. Provides a modular design that facilitates maintenance, updating/upgrading of protocols and implementations (by various vendors) at the various layers of the stack. Supports a flexible framework for future advances and inventions (such as mobile or sensor networks). Disadvantages: overhead of headers, redundancy of functions (sometimes not needed) [such as reliability as the transport layer and the link layer, or routing at the network layer and some link layer protocols (such as ATM)] It is true in many cases that the change in one layer does not affect the change in the other layers, but not always. Examples of change that did not affect the other layers: change from FDDI to token ring, to Ethernet at the MAC layer. Examples of change that affected other layers: wireless vs. wired (performance of TCP and routing degraded drastically). Introduction of 802.11 for wireless and ad hoc networks (a change in the physical and MAC layers), does affect in a major way routing at the network layer and the transport layers. In that case, many of the protocols needed re-design. Q4. (10 total points) Design parameters: In order to be able to analyze performance of the Internet protocols a researcher needs to model some parameters, such as number of nodes in the network, in addition to many other parameters. a. Discuss 4 different main parameters one would need to model in order to evaluate the performance of Internet protocols. [Elaborate on the definition of these parameters and their dynamics] b. Discuss 2 more parameters for mobile wireless networks [these two parameters are not needed for the wired Internet] Answer: a. Traffic model temporal and spatial (packet arrival processes, session/flow arrival processes, spatial distribution of traffic (src-dst) pair distribution across the topology), topology/connectivity model, node failure model, membership dynamics (for multicast) spatio-temporal models. [Any reasonable 4 parameters are ok, with 1.5 points per parameter] b. For mobile wireless networks there is a need to model ‘mobility’ (spatio-temporal), and wireless channel dynamics/loss/bandwidth since it changes with time much more drastically than the wired Internet (in which virtually the max bandwidth of a channel/link is static) [Any 2 reasonable parameters are ok, with 2 points per parameter] II. Statistical multiplexing and queuing theory Note: You may want to make use of the following equations: M/D/1: queuing delay ; Ts is service time & Ï  is link utilization M/D/1: average queue length or buffer occupancy M/M/1: queuing delay , buffer occupancy: Q5. (8 points) Consider two queuing systems, serving packets with lengths that have exponential distribution, and the packet arrival process is Poisson. The first queuing system (system I) has a single queue and a single server, and hence the packet arrival rate is X, and the server speed is Y. The second queuing system (system II) has two queues and two servers, and hence the packet arrival rate is X/2, and the server speed is Y/2. Derive a relation between the delays in each of these systems. What conclusion can you make? Answer: (8 points) We use the M/M/1 queue (because the question states Poisson arrival and exponentially distributed service time). For the first system (I): Tq=Ts/(1-Ï )=1/M(1-ÃŽ »/M)=1/Y(1-X/Y), For the second system (II): Tq=2/Y(1-X/Y)=2Tq (of system I) That is, using ‘1’ queuing system performs better than using ‘2’ queues with half of the arrival rate and half of the output link capacity. Q6. (5 points) In an Internet experiment it was noted that the queuing performance of the switches/routers was worse than expected. One designer suggested increasing the buffer size in the routers drastically to withstand any possible burst of data. Argue for or against this suggestion, and justify your position. A6. Increasing the buffer size allows switches to store more packets (which may reduce loss). However, it does not alleviate the congestion. If this was the only cure proposed, then we expect the queues to build up, increasing the buffer occupancy, and increasing the delays. If the build up persists (due to lack of congestion control for example) the queues shall incur losses and extended delays. Delays may lead re-transmission timers to expire (for reliable protocols, such as TCP) leading to re-transmissions. Also, the TTL value in the header of each packet is reduced based on time (and hop count). So, many of the TTLs may expire leading to the discard of packets. So, in ge neral, only increasing the buffer sizes does not help improve the queuing performance. Q7. (7 points) Describe the network design trade-off introduced by using statistical multiplexing and define and describe a metric that captures this trade-off. A7. (7 points: 3.5 for the link between stat muxing and congestion and 3.5 for the trade off metric (network power) and its description). Statistical multiplexing allows the network to admit flows with aggregate capacity exceeding the network capacity (even if momentarily). This leads to the need for buffering and the ‘store and forward’ model. Subsequently, queuing delays and build up may be experienced as the load on the network is increased. Two major design goals of the network is to provide maximum throughput (or goodput) with least (or min) delay. However, these two goals are conflicting. In order to increase the throughput, the congestion increases and so does the delay. In order to reduce the queuing delays then we need to reduce the load on the network and hence the goodput of the flows would decrease. This is the throughput-delay trade off in network design. One metric that captures both measures is the network power=Tput/Delay, as the Tput increases, so does the network power, and when the delay decreases the network power increases. Q8. (8 points) Flows in the Internet vary widely in their characteristics. Someone suggested that in order to be fair to the various heterogeneous flows then we need the different flows to experience the same delay at the different queues. Argue for or against this suggestion. A8. (8 points: 4 points for the constant ratio and the link to the fluid flow model, 4 points for the unfairnes/greed description) In order to provide the same delay for the various flows we need to maintain the rate/capacity ratio constant (this is based on the fluid flow model we introduced in class). Hence, if the different flows arrive at various rates, then the capacity allocation should reflect such variation. The allocation leading to same delays would favor (i.e., allocate more capacity to) flows with higher rates at the expense of flows with low rates. This strategy encourages greed in the network and cannot achieve fairness, where the existence of high rate (large) flows in the network would adversely affect low rate (small) flows in the network by increasing the overall delay experienced by all the flows. Q9. (12 total points) Consider a network that uses statistical multiplexing. The network has ‘N’ number of ON/OFF sources, each sending at a rate of R packets per second when ON. All the sources are multiplexed through a single output link. The capacity of the output link is ‘M’. – A. (3 points) What is the condition on N, R and M in order to stabilize this network? – When the number of sources to be supported is increased from R to 10R, there were two suggestions to modify the network: Suggestion I is to replicate the above system 10 times. That is, create 10 links, each with capacity of ‘M’ handling R sources. – Suggestion II is to replace the link with another link of capacity ’10 M’ B. (9 points) Which suggestion do you support and why? [Argue giving expressions for the delay/buffer performance of each system. Give both the advantages and disadvantages of each case] Answer: ÃŽ ±=ÃŽ »Ã  A. (3 points) The conditions for a stable network are N.R. ÃŽ ± < M, N.R > M, where ÃŽ ± is the fraction of the time the sources are ON (on average) If ‘N.R. ÃŽ ± > M’, then this leads to constant build up of the queue with no change of recovering from congestion (and draining the queue), which would lead to unstable system. B. (9 points) Write down the equations, M/D/1: queuing delay ; Ts is service time & Ï  is link utilization M/D/1: average queue length or buffer occupancy M/M/1: queuing delay , buffer occupancy: The buffer occupancy depends on Ï  only. If Ï  is the same (i.e., the load on the queue server is the same) then the buffer occupancy is the same, Ï  = ÃŽ ». Ts = ÃŽ ±. N. R / M Increasing the bandwidth of the link to 10M means that we can get the same average buffer occupancy in the two systems. In system I we would need 10 times the buffer size as in system II, so system II is advantageous in that sense. (more sharing and statistical multiplexing) In addition, the queuing delay will be decreased drastically (by a factor of 10) where Tq=Ts. f(Ï ) (6 points for the above argument) (3 points) On the other hand the std deviation/fluctuation around the average in the queue size will be higher since it is shared by more number of flows, and hence the jitter will be relatively higher. III. Application layer and related issues Q10. (5 points) (Stateful vs. Stateless) Discuss one advantage and one disadvantage of having a ‘stateful’ protocol for applications. Advantage: The protocol can now maintain state about (i.e., remembers) users preferences (e.g., shopping preferences as in browser cookies), Disadvantage: when failure occurs the state needs to be reconciled (more complexity and overhead than stateless) [other correct and reasonable answers are accepted] Q11. (5 point) (Web Caching) Describe how Web caching can reduce the delay in receiving a requested object. Will Web caching reduce the delay for all objects requested by a user or for only some of the objects? Why? Ans. Web caching can bring the desired content â€Å"closer† to the user, perhaps to the same LAN to which the user’s host is connected. Web caching can reduce the delay for all objects, even objects that are not cached, since caching reduces the traffic on links. Q12. (1 0 points) Discuss three different architectures of the peer-to-peer applications. Give examples of real applications for each architecture and discuss the advantages and disadvantages of each architecture. Ans. 1. Centralized directory of resources/files, as in Napster. Advantage is that search for resources is simple with min overhead (just ask the centralized server). The disadvantages are: single point of failure, performance bottleneck and target of lawsuit. 2. Fully distributed, non-centralized architecture, as in Gnutella, where all peers and edges form a ‘flat’ overlay (without hierarchy). Advantages: robustness to failure, no performance bottleneck and no target for lawsuit. Disadvantages is that search is more involved and incurs high overhead with query flooding. 3. Hierarchical overlay, with some nodes acting as super nodes (or cluster heads), or nodes forming loose neighborhoods (sometimes referred to as loose hierarchy, as in BitTorrent). Advantages, robust (no single point of failure), avoids flooding to search for resources during queries. Disadvantages, needs to keep track of at least some nodes using the ‘Tracker’ server. In general, this architecture attempts to combine the best of the 2 other architectures. Q13. (7.5 points) Push vs. Pull: A. Give examples of a push protocol and a pull protocol B. Mention three factors one should consider when designing pull/push protocols, discuss how these factors would affect your decision as a protocol designer (give example scenarios to illustrate). Answer: A. An example of a push protocol is: http. An example of a pull protocol: SMTP B. The factors affecting the performance of a pull/push protocol include (but are not limited to): 1. access pattern: how often is this object cached and how often is it accessed (example: a push mechanism for a very popular video that is pushed closer to a large population that is going to frequently watch it, would be better than a pull mechanism), 2. delay: what is the delay to obtain the object, and 3. object dynamics: how often/soon does the information in the object expires (example: in a sensor network where the information sensed is constantly changing, but is queried once in a while would be better ‘not’ to push it, but to pull it when needed only). Q14. (7.5 points) We refer to the problem of getting users to know about each other, whether it is peers in a p2p network or senders and receivers in a multicast group, as the â€Å"rendezvous problem†. What are possible solutions to solve the rendezvous problem in p2p networks (discuss three different alternatives and compare/contrast them. Answer: The possible solutions for the rendezvous problem include: 1. Using a centralized server: advantages: simple to search, little communication overhead. Disadvantages: single-point-of-failure (not robust), bottleneck, doesn’t scale well 2. Using a search technique for discovery, perhaps using a variant of a flood (or scoped-flood) or expanding-ring search mechanism. Advantages: avoids single-point-of-failure and bottlenecks. Disadvantages: may be complex, incurs high communication overhead and may incur delays during the search. 3. hybrid (or hierarchy): where some information (e.g., pointers to potential bootstrap neighbors, or pointers to some resources) are kept at a centralized (or replicated) server or super-nodes, then the actual communication is peer-topeer. Advantage: if designed carefully can avoid single-point-of-failure, bottlenecks, and achieve reasonable overhead and delay. Disadvantage: need to build and maintain the hierarchy (can trigger costly re-configuration control overhead in case of highly dynamic networks and unstable super-nodes).