Computer Communication Networks - May 2014

Electronics Engineering (Semester 7)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1 (a) List the functions of the network layer in the OSI model.(5 marks) 1 (b) What are transmission impairments? Explain each briefly.(5 marks) 1 (c) What is sub-netting? List advantages and disadvantages of the same.(5 marks) 1 (d) Explain STS-1 frame format.(5 marks) 2 (a) Draw block diagram of functional architecture of ISDN and explain. (10 marks) 2 (b) Explain automatic protection switching in Sonet networks.(6 marks) 2 (c) Compare twisted pair and coaxial cables.(4 marks) 3 (a) Compare Go back N ARQ and Selective reject ARQ. What is the maximum size for both?(10 marks) 3 (b) State and explain the working of a TSI switch. (5 marks) 3 (c) Distinguish between in-band signaling and out-band signaling in circuit switched networks.(5 marks) 4 (a) Distinguish and explain in detail Router, Hub, Switch, Bridge, Gateway.(10 marks) 4 (b) Explain "flooding" in packet network. State advantages and applications.(5 marks) 4 (c) Distinguish between implicit congestion signaling and explicit congestion signaling. (5 marks) 5 (a) Apply Dijkstra's and Bellman ford algorithm to the given network and find the least cost path between source node ?I to all the other nodes :
(10 marks) 5 (b) Explain Section, Line and Path with respect to SONET.(5 marks) 5 (c) Distinguish between synchronous and asynchronous transmission. (5 marks) 6 (a) Explain IEEE 802.2 standard. Sketch the general MAC frame format and LLC PDU structure. Explain the functions of the different fields.(10 marks) 6 (b) Distinguish between the following token re-insertion strategies.
i. Single Token Operation
ii. Multiple Token Operation
iii. Single Frame Operation(10 marks)

Write short notes on (Any four) : -

7 (a) Berkeley API.(5 marks) 7 (b) ADSL(5 marks) 7 (c) IPV4 and IPv6(5 marks) 7 (d) TCP and UDP(5 marks) 7 (e) V series modem standards.(5 marks)