21-01-2013, 12:34 PM
IV B.Tech I Semester Regular Examinations, November 2006 COMPUTER NETWORKS
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1. (a) List two advantages and two disadvantages of having international standards
for network, Protocols?
(b) With a neat diagram, explain the functionality of layers, protocols and inter-
faces. [8+8]
2. (a) Given 1101011011 data frame and generator polynomial G(x) = x4 + x + 1,
derive the transmitted frame.
(b) What is pipelining? With an example, explain Go back-n sliding window
protocol. [8+8]
3. (a) Explain WDMA protocol.
(b) Explain wireless LAN protocol. [8+8]
4. (a) What is flooding? What are the variations of flooding?
(b) What are the problem which caused demise of distance vector routing? Ex-
plain the algorithm that replaced it? [8+8]
5. (a) Imagine that a two-way handshake rather than a three-way handshake were
used to set up connections. In other words, the third message was not required.
Are deadlocks now possible? Give an example or show that none exist.
(b) Datagram fragmentation and reassembly are handled by IP and are invisible
to TCP. Does this mean that TCP does not have to worry about data arriving
in the wrong order? [8+8]
6. (a) Briefly discuss about connection less Internetworking.
(b) Explain firewalls, packet filter and a proxy in detail. [8+8]
7. (a) Can AAL 1 handle messages shorter than 40 bytes using the scheme with the
Pointer field? Explain your answer.
(b) AAL 3/4 allows multiple sessions to be multiplexed onto a single virtual circuit.
Give an example of a situation in which that has no value. Assume that one
virtual circuit has sufficient bandwidth to carry all the traffic.
© What is the payload size of the maximum length message that fits in a sinlge
AAL 3/4 cell?