Essay on Sample Exams Questions and Answers on Computer Networks

1408 Words Apr 16th, 2013 6 Pages
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
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‘D’ forwards the request to the neighbouring node ‘G’ (Destination). Each time, the node is added, the node address is appended to route the record of RREQ. Hence, in the RREP packet, the whole address or route is described as ‘A-C-E-D-G’. The chosen path is of course ‘A-B-D-G’, since it requires less number of hops.

B A-B-D-G A A A

A-B-D-G A-B D

A-B-D-G A-B-D

G

A-C-E E H A-C-E A-C-E F

C

A-C

1. List the main components of a Mobile IP. 2. Explain the registration process using a figure in Mobile IP between the mobile node (MN) and home and roaming networks. [8 marks] Main components of Mobile IP are: Mobile Node (MN) Home Agent (HA) Foreign Agent (FA) Care of Address (COA) Correspondent Node (CN)

Roaming

Home

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 marks)

A

B

C

Figure 2: Terminals A, B, and C and their signals.

Question. Packet switching and circuit switching are two ways of architecting data transfer in the core of a network. a) How do packet switching and circuit switching networks differ in general? (7%) b) Outline the advantages that circuit-switched network has over packet-switched network. (6%) c) Suppose users share 1Mbps link. Also suppose each user requires 100 Kbps when transmitting, but each user transmits only 10 percent of the time. (12%)

Question: Wireless links suffer from unfavourable

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