Sample Exams Questions and Answers on Computer Networks

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CCM 4300 Lecture Computer Networks, Wireless and Mobile Communication Systems SAMPLE EXAM QUESTIONS Dr P. Shah 1 Show that, according to the Shannon-Hartley law, if the signal power (S) is equal to the noise power (N), the channel capacity (C) in b/s is equal to the bandwidth B Hz. (6 marks) C= B log2 (1+S/N) If S=N C=B log2 (1+1) C=B log2 (1+1) C= B log2 (2) C=B 2 What are the purposes of the following GSM networks? VLR HLR MSC (home and visited) (6 marks) VLR: it is a database maintained by the visited network that contains an entry for each mobile user that is currently in the portion of the network served by VLR. HLR: a database that is maintained by the home network which contains permanent cell phone number and…show more content…
Give one example for each type and draw a figure for each case to show your understanding. (12%) b)Show that, according to the Shannon-Hartley law, if the signal power (S) is equal to the noise power (N), the channel capacity (C) in b/s is equal to the bandwidth B Hz. (6%) c) Figure 2 shows three terminals A, B, and C. Terminals A and B transmits to the terminal C. Explain the Near-Far problem using figure 2. (7%) A B C Figure 2: Terminals A, B, and C and their signals. State the possible services that a link layer protocol offers to the network layer. Which of these services have corresponding services in IP and TCP? (5%) Discuss for what kind of applications it is preferable to use Transmission Control Protocol (TCP) and for what kind of applications the application developer might prefer to use the User Datagram Protocol (UDP). (6%) Is it possible for an application to enjoy reliable data transfer even when the application runs over UDP? Explain how. (4%) Describe hidden and exposed terminal problems, provide scenario. (8%) (RTS/CTS?) How many HOST addresses are available in a /27 (27 bits are used for the network addresses) network? (2%) There are two ways in which communication occurs between a managing entity and a managed device: request-response mode and trapping mode. Discuss the pros and cons of these two modes in terms of: overhead,

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