GTU previous question papers
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- Vth SEMESTER–EXAMINATION – MAY/JUNE – 2012
Subject code: 1502
Subject Name: Computer Network
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) (i) Which network replaced X.25 networks? What is
the essence of this new network?
(ii) What is cyclic redundancy check? Show the
calculation polynomial code checksum for a
frame 1101011011 using the generator x4+x+1.
(b) What is the purpose of physical layer? Explain multimode
fiber and single mode fiber. Explain the transmission of light through fiber.
Q.2 (a) Explain link state routing with all the five steps in detail.
(b) Explain the term piggybacking, sending window and
receiving window. Explain One-Bit sliding window protocol.
(b) Explain the following two collision free protocol.
(i) A bit map protocol
(ii) Binary countdown
Q.3 (a) How route discovery is done in Ad Hoc networks. Explain format of ROUTE REQUEST and ROUTE REPLY packet.
(b) Explain the following techniques for achieving good
quality of service.
(i) Traffic shaping
(ii) Leaky bucket algorithm
Q.3 (a) Explain congestion control in Datagram subnets. Write about hop by hop choke packets scheme.
(b) Write about OSPF(open shortest path first). Which four
classes of routers are distinguished by OSPF?
Q.4 (a) (i) Explain following with respect to
ATM(asynchronous transfer mode)
a) Virtual circuits
a) nonpersistent CSMA
b) p-persistent CSMA.
(b) (i) Which two different modes of operation are
supported by Gigabit Ethernet?
(ii) What is the similarity and difference between
switch and bridge. Also explain cut through
Q.4 (a) (i) Write the two differences between Ethernet and
wireless LAN 802.11 in the physical and data link
(ii) Explain switched Ethernet.
(b) (i) Explain spanning tree bridges
(ii) Explain remote bridges.
Q.5 (a) Explain connection establishment and connection release in
(b) E-mail systems contain which two subsystems? Write the
five basic functions provided by e-mail system.
Q.5 (a) Write about flow control and buffering mechanism in
(b) Describe the built in HTTP request methods.
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