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Computer Communication & Telecom Networks : Question Paper Dec 2015 - Electronics & Telecomm. (Semester 6) | Mumbai University (MU)

Computer Communication & Telecom Networks - Dec 2015

Electronics & Telecomm. (Semester 6)

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.


Solve the following.

1 (a) Compare between pure ALOHA and Slotted ALOHA.(5 marks) 1 (b) Explain working principle of selective repeat ARQ.(5 marks) 1 (c) What is the use of subnetwork in IP addressing.(5 marks) 1 (d) What is bit and byte stuffing explain with example.(5 marks) 2 (a) Discuss various scheduling methods used in MAC.(10 marks) 2 (b) Explain need of fragmentation and field related to fragmentation in IP datagram.(10 marks) 3 (a) Solve the following related of IP datagram:
i) Which field shows number of hop count
ii) If HLEN value is 5 and length of data is 24 bytes. Calculate option.
iii) What are differentiate services?
iv) Packet version of 0.10 is discarded. Justify.
(10 marks)
3 (b) Draw and explain connection establishment using 3 way handshaking in TCP.(10 marks) 4 (a) What is DSL and HFC? Describe in brief.(10 marks) 4 (b) What is IEEE 802.11? Explain features of IEEE 802.11. Draw the architecture of IEEE 802.11.(10 marks) 5 (a) What do you mean by decentralized peer to peer file sharing? How it is different from centralized system.(5 marks) 5 (b) What are the components of ATM? Explain in brief.(5 marks) 5 (c) What is the role of ICMP protocol? Explain the error message of ICMP.(5 marks) 6 (a) An ISP granted a block of addressing starting with 127.60.4.0/20. The ISP wants with each organization receiving 8 address only design subblock and give the slash notation for each subblock.(10 marks) 6 (b) Which protocol gives mapping of name with IP address? Explain working of such protocol with different records.(10 marks)

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