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Posted Date: 20 Aug 2008 Posted By: Nitin Member Level: Platinum
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2006 The Institution of Engineers,India A.M.I.E.T.E Electronics & Tele Communication Engineering COMPUTER NETWORKS University Question paper
Code: A-28 Subject: COMPUTER NETWORKS
Time: 3 Hours June 2006 Max. Marks: 100
NOTE: There are 9 Questions in all.
• Question 1 is compulsory and carries 20 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.
• Out of the remaining EIGHT Questions answer any FIVE Questions. Each question carries 16 marks.
• Any required data not explicitly given, may be suitably assumed and stated.
Q.1 Choose the correct or best alternative in the following: (2x10)
a. The _________ layer changes bits into electromagnetic signals.
(A) physical (B) data link
(C) transport (D) none of (A), (B) and (C)
b. ________switching uses the entire capacity of a dedicated link
(A) circuit (B) message
(C) virtual circuit (D) datagram
c. In an asynchronous TDM, for N signal sources, each frame contains M slots, where M is usually___________N.
(A) equal to (B) greater than
(C) less than (D) one less than
d. HDLC________field defines the beginning and end of a frame.
(A) flag (B) address
(C) control (D) FCS
e. ________is the access protocol used by the conventional Ethernet.
(A) CSMA (B) CSMA/CD
(C) CSMA/CA (D) Token ring
f. Stations do not sense the medium during_____time.
(A) RTS (B) CTS
(C) SIFS (D) NAV
g. Which OSI layer corresponds to the IP layer?
(A) physical (B) data link
(C) transport (D) network
h. In______ARQ, if a NAK is received, only the specific damaged or lost frame is retransmitted.
(A) Stop and wait (B) selective repeat
(C) go-back-N (D) (A) & (B)
i. The VPI of an NNI is________bits in length.
(A) 8 (B) 12
(C) 16 (D) 24
j. Digital signature can provide _____for a network.
(A) Authentication
(B) Integrity
(C) Non-repudiation
(D) All of the (A), (B) and (C)
Answer any FIVE Questions out of EIGHT Questions.
Each question carries 16 marks.
Q.2 a. Make a comparison of OSI reference model with TCP/IP reference model. (8)
b. Suppose two new devices are added to an existing 6 devices network. If the network has a mesh topology, how many new cable links are needed? How many new cable links will be needed if the network has a ring topology? (4)
c. With suitable diagrams and data organized in time slots, explain how synchronous TDM is different from asynchronous TDM.
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