( 03000CS306052002 Pages: 3

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Sixth semester B.Tech degree examinations (S), September 2020

Course Code: CS306
Course Name: COMPUTER NETWORKS

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries 3 marks. Marks
1 Discuss the uses of computer networks in home applications (3)
2 Why are the layers from Transport layer and above called truly end to end (3)
layers?
Describe error control and flow control in data link layer. (3)
4 Demonstrate the significance of sequence numbers in stop and wait ARQ. (3)
PART ‏تا‎

Answer any two full questions, each carries 9 marks.
5 Discuss the purpose of the various layers in ISO-OSI reference model with (9)
the help of a diagram.
6 9) Show the design issues of physical layer and network layer. (4)
b) Discuss about Go-Back-N ARQ. The timer for only the first outstanding (5)
frame is set in Go-Back-N ARQ. Analyse the protocol and illustrate how all
the outstanding frames are managed with just one timer.
7 How does Multiple Access with Collision Avoidance solve the hidden node (9)
problem and exposed node problem in Wireless LANs?
PART C

Answer all questions, each carries 3 marks.

8 How is routing table different from forwarding table? (3)
9 Demonstrate reliable flooding with the help of an example. (3)
10 Describe any two congestion control methods in virtual circuit subnets. (3)
11 Describe the techniques for achieving good Quality of Service. (3)

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