Computer Network Assignment

COMPUTER NETWORKS 4TH MARCH 2012 Examination Paper Answer ALL questions. Clearly cross out surplus answers. Time: 2 hours Any reference material brought into the examination room must be handed to the invigilator before the start of the examination. ANSWER ALL QUESTIONS Marks QUESTION 1 a) State FOUR (4) principles underpinning the Open Systems Interconnection (OSI) Reference Model. b) Describe the purpose of the physical layer of the OSI Reference Model. c) State THREE (3) elements of network design that relate to the physical layer of the OSI Reference Model. ) Describe the purpose of the data link layer. 4 1 3 2 Total 10 Marks QUESTION 2 a) b) c) d) Define the term a packet as used in computer networks. Briefly describe the THREE (3) key components of a packet. Explain the difference between a LAN, MAN and WAN. Describe how signal reflection could be a problem in an Ethernet LAN and explain how this is prevented. 1 3 3 3 Total 10 Marks QUESTION 3 a) b) c) d) Explain why wireless t echnology was not initially widely adopted. State THREE (3) advantages to using wireless peripheral devices. Describe what a wireless adapter is.Windows 7 Check Your UnderstandingDescribe what an access point is. 3 3 2 2 Total 10 Marks QUESTION 4 a) b) c) d) Explain what physical topology is. Explain what logical topology is. Describe how physical topology and logical topology relate to each other. Describe how point to point networks operate. 2 2 2 4 Total 10 Marks QUESTION 5 a) b) c) J State FIVE (5) factors to consider when choosing physical media for a computer network. State FOUR (4) advantages to using fibre-optic cable as a network medium. State the main disadvantage to using fibre-optic cable as a network medium. 4 1 Total 10 Marks QUESTIONS CONTINUE ON NEXT PAGE Page 2 of 3 Computer Networks March 2012 Formatted/HW Â © NCC Education Ltd 2012 Marks QUESTION 6 a) b) Explain what a repeater is and briefly describe how it works. Explain what a router is and briefly describe ho w it works. 6 4 Total 10 Marks QUESTION 7 a) b) c) List FIVE (5) key factors to take into account when locating wireless access points. You have located an access point in the best available place for your wireless network but it is not providing the complete coverage you require.State THREE (3) options you have to extend the coverage of the wireless network. Your wireless network allows public access via a login page. Describe TWO (2) features that should be included in your login page. 5 3 2 Total 10 Marks QUESTION 8 a) b) c) d) A secure network offers privacy. Explain what privacy is in this context. A secure network offers integrity. Explain what integrity is in this context. A secure network offers availability. Explain what availability is in this context. Describe a man-in-the-middle attack. 2 3 2 3 Total 10 Marks QUESTION 9 a)Firewall traffic blocking rules can be created for network traffic based upon a number of different properties. State THREE (3) properties that are use d to create firewall rules. b) Explain what a router firewall does. c) List FOUR (4) key tasks that are vital for managing a firewall. 3 3 4 Total 10 Marks QUESTION 10 a) b) c) State the THREE (3) main functions of a Network Operating System (NOS). Describe how a redirector works. State THREE (3) network services that a NOS will typically enable. 3 4 3 Total 10 Marks END OF EXAM Page 3 of 3 Computer Networks March 2012 Formatted/HW Â © NCC Education Ltd 2012

Drivers Ed

Copy and paste the questions into the student comments section. Read the questions thoroughly. Answer the questions in a full and complete manner. Use complete sentences, including proper spelling and grammar. When you are ready to turn in your assignment, add a check mark to the Submit for Grading box and then select Submit. Module 3: Natural Forces Affecting the Driver Vocabulary: Please define six (6) of the following terms in your own words. Please do not just copy and paste the definition. 1.Gravity- Heaviness or weight. 2. Inertia- Inertness, especially with regard to effort, motion, action, and like ; inactivity; sluggishness. 3. Potential Energy- The energy of a body according to the position of the body 4. Kinetic Energy- The energy of a body according to the motion of the body or of the particles in the system. 5. Friction- Surface resistance to relative motion, as of a body sliding or rolling. 6. Traction- The adhesive friction of a body on some surface, as a wheel on a rail or a tire on a road. 7.Centrifugal Force- An outward force on a body rotating about an axis, assumed equal and opposite to the centripetal force and postulated to account for the phenomena seen by an observer in the rotating body. 8. Centripetal Force- The force, acting upon a body moving along a curved path, that is directed toward the center of curvature of the path and constrains the body to the path. 9. Deceleration 10. Force of impact- Module 4: Signs, Signals & Pavement Markings 1. Explain the purpose of the followingA. The difference between solid and broken lines is:B.Yellow lines (broken or solid) indicate what type of traffic flow:C. White lines (broken or solid) indicate what type of traffic flow:2. Observe and describe the different signs in YOUR city. Give specific examples of each (include color, shape, what the sign is for, etc. ).A. A regulatory sign:B. A motorist services sign:C. A recreational sign:D. A sign that you know what it means because of its shape:*If each of the above signs do not appear in your town then describe any 3 different types you see in your community. 3. Explain 3 interesting or important facts from Module 3 and 4. A. B. C.

Fundamental Perspectives and Techniques of Decision Making Dissertation

Fundamental Perspectives and Techniques of Decision Making - Dissertation Example In the contemporary uncertain business contexts, making a decision which has certainly long-term implications on business requires thorough understanding of all possible future situations and more importantly the managerial ability to balance both controllable and uncontrollable parameters (Bhushan and Rai, 2004, p. 3). Managerial decisions are key factors to influence a firm’s success and failure. Managers need to ensure that their firms are able to continually innovate and get accustomed with changing business environments so that it can maintain a reasonable stance and pace in competitive edge. If managers want their firms to survive in the dynamic and uncertain business conditions, they need to carry out effective decision making processes. ... Creative thinking aims at bringing newer ideas whereas problem solving is directed to find a solution, an answer or a conclusion (Adair, 2010, p. 1). An individual or organizational decision is the end result of much more dynamic processes and a series of activities labeled as ‘decision making’. McGrew, Wilson & Wilson (1982, p. 5) stated that the decision maker, in his decision making process, identifies the problem, clarifies particular goals that are desired, examines various possibilities for achieving the desired goal and finally completes the process by taking a definitive choice of action. Decision is therefore an answer to a specific question or some problems or a choice between two more courses of actions. Ahmad, Hasnain and Venkatesan (2012, p.21) described a five-stage process for decision making. It comprises of identifying all alternatives, valuing these different choices according to preferences and potential outcomes, assembling the information, choosing a mong the preferences and outcomes and finally selecting the most favourable and appropriate choice. Decision that has been taken after careful coordination of information, evaluation of potential outcomes and analyzing of various preferences based on advices, suggestions and help of people involved as members in a group-decision making has been found to be very effective in terms of its appropriateness and positive outcomes. Decision making is a cognitive process that involves logical reasoning and creative thinking about choosing a specific course of action that is supposed to bring the decision maker to a certain result. One of the key challenges in decision making is reducing or eliminating the uncertainty. A better way to avoid uncertainty is to collect relevant information before

Journal entry Essay Example | Topics and Well Written Essays - 250 words - 2

Journal entry - Essay Example Prior to composing poems and children books, Donald Hall was a teacher; he did not enjoy the job especially when marking the papers of the students. He quit the teaching job to become a poet (Hall 348). Donald Hall provided insufficient information as to how he became a poet. How did he learn that he would enjoy spending the rest of his time at home, writing poems and children books? In addition, he also failed to recognize that it requires a talent for one to be a poet or writer. Not all people are blessed on the same level, and Donald Hall was a gifted individual since he enjoyed writing poems and was gifted in the sector. Through the poems, people were inspired and motivated to change their ways. Nonetheless, not everyone has the capability of using personal interest to earn a living (Hall 349). Therefore, people are forced to work in areas of less interest, to fulfill life’s goals. This has led to a number of people complaining about their careers. Donald Hall could have d iscussed further, how an individual could be able to discover personal interest that could be useful throughout their

Economics cuurent macroeconomic situation Research Paper

Economics cuurent macroeconomic situation - Research Paper Example These figures are significantly showing progress but by no means indicate that things are turning out for the best (Avent, 2010). Unemployment and its direct correlation with inflation clearly show on these figures. This indicates that stimulus packages and the low interest rates provided by the government is showing its effects. Without these, businesses would not venture into accruing capital and entrenchment would ensue. More and more firms and departments are hiring temporary workers including census jobs which will show countercyclical effects. This suggests that confidence and optimism is slowly gaining momentum. It is a clear indication that more needs to be done before the country can truthfully say that it is out of the recession slump. Robert Reich (2010) suggests that only reason the economy is not in a double-dip recession is due to the boosts injected by the government. He further adds that 41,000 new jobs provided in May which mostly consisted of temporary Census workers is not enough. At the minimum, 100,000 new employments are needed every month to cope with the population growth. Apprehensions are now directed over what will happen once these are directly withdrawn from the economy. Policy makers play an integral role in ensuring the health of the economy doesn’t flat line. The applied easy money policy tools which are apparent in the contingency efforts of the government to stabilize the economy are already in place. It becomes indispensable at the current situation but â€Å"Effectively zero interest rates are creating distortions in capital markets. Monetary conditions need to be back to normal by the time economic slack disappears and inflationary pressures begin to reassert themselves† (Padoan, 2010). Government hand can only go so far before it reverts into prioritizing the need for other programs before money runs out and the Federal Reserve reverts to government

Dra Rod DB 4 Assignment Example | Topics and Well Written Essays - 250 words

Dra Rod DB 4 - Assignment Example The elements of the play that enforce that Wilson’s play is about African-American life than the universal man include; Troy’s inability to participate in professional baseball as a young man, and the fact that he had to consult their boss Mr. Rand to become a truck driver (Fences 40). Troy Maxson sets up the direction of the play’s plot in such a way that the theme of fatherhood and responsibility are depicted throughout the play. Events such as unfaithfulness in his marriage create a struggle for him as his wife takes care of another woman’s child but ends her relations with Troy. The rivalry between Troy and Cory is revealed when the father denies him the chance to play baseball professionally hence making the son move out of the house (Fences 57-60). The comment that surprised me in the interview was that when African Americans go back to Africa they are treated as white tourists and in the dictionary the blacks are regarded as violators of laws. This is interesting because in one land they are discriminated and in another they are celebrated and regarded as visitors. I felt that the interviewer does not get what Wilson was saying at the end of the interview. This is because he wonders why Wilson defends the blacks all the time yet one of his parents is white. What Wilson says relates to my experience in the world as I have witnessed some African-Americans striving to look for jobs and those in employment earning low incomes. Wilson’s play created a realistic set of characters and situations effectively as it displayed what happens in most African-American families where one of the relatives could be in prison, parents struggling to get money to pay their bills and their children discriminated in society because of their races. I would particularly relate to the scene where Cory is denied by the father a chance to play professional

Search Integration of Social Media Research Paper

Search Integration of Social Media - Research Paper Example In the wake of globalization, various firms need to embrace the cultural diversity by incorporating various major search languages in its marketing strategy thereby giving organizations a local appeal in its geographically dispersed market. This is one of the tools that Zarah seems to utilize with an immense command on the market size in the fashion industry. It is common to realize that social media requires customization in respect of the cultural differences prevalent in the world and this has been done by introducing the use of various languages that are tailored to meet the demands of people (Hoffman & Bateson, 2009). It is, therefore, a boost for the organization to act locally and think globally in respect of placing website adverts. It has adopted online sales that constitute the display of varieties that the customers simply click on and obtain all the required information then transact online. This is more convenient for many people due to the paradigm shift of socio-econom ic order of the society which keeps people busy most of the time. It has equally diversified the social networking sites thereby enhancing chances of reaching out to many clients of all age brackets around the world. To optimize the use of social media, Zarah has a very active Twitter, Facebook, google+, daily blogs and other accounts on which it is able to count on the number of likes and pins after posting pictures of its variety of products. The figures obtained in this process and the comments provide a basis for reorganizing its strategies on appropriate marketing mix. Zarah also utilizes the social media to take note of the global fashion trend by responding immediately through Twitter and its other social media sites and collecting feedback on desires and modifications preferable to the existing and potential customers (Hoffman & Bateson, 2009). This has the updating effect with attraction consequences to the potential customers who are prolific internet browsers.