CS-68 Computer Networks

Q.1.
(a) Explain the functions of repeaters and bridges. What are their limitations?

(b) Differentiate between Datagram packet switching and Virtual circuit switching.

(c) Explain the classes of service defined for ATM. Give an example for each service class.

(d) What is an internetwork? Explain the purpose of internetworking devices used to connect different LAN segments.

(e) Differentiate between the following:
(i) Half duplex and Full duplex transmission
(ii) Analog and Digital signal

(f) Differentiate between Time Division Multiplexing and Frequency Division Multiplexing.

(g) Can a device have more than one IP address? Give reason.

Q.2.
(a) Explain the working of Transparent Bridges. Also, write any three advantages and two disadvantages of transparent bridges.

(b) Draw the structure of header for Network-Node Interface (NNI) ATM Network. Explain the purpose of each field in this header.

Q.3.
(a) Explain the working of Routing Information Protocol (RIP). Also, explain the common problems that can occur with RIP

(b) What is meant by “domain name”? How is a domain name translated to an equivalent IP address? Explain with the help of an example.

(c) Why is TCP reliable and UDP unreliable protocol?

Q.4.
(a) Explain the various layers of TCP/IP model. Also, list the protocols used in each layer.

(b) List and explain architect and protocols of any three LAN standards.
(c) What are the advantages of ISDN.

Q.5.
(a) Does the efficiency of ATM using AAL depend on the size of the packet? Explain and justify your answer.

(b) What are the differences between “Go-Back-N’ and ‘Selective-Repeat’ sliding window protocols? Explain using an example.

(c) Write short notes on the following:
(i) Remote Procedure Call
(ii) X-25 gateway
(ii) Crash Recovery