Mumbai University Previous year question papers
V Sem CSE Examination Dec 2007
N.S. : (1) Attempt any five questions.
(2) Figures to the right indicate full marks.
(3) Assume suitable data if required.
1.a) Show the NRZ, Manchester and NRZI encoding for the bit pattern
b) Explain the following with examples. MAC address, IP address, Socket, Baud-rate, latency..
2.a) Explain why the ISO-OSI model of computer network is layered? How it is differentfrom TCP/IPModel?
b) What is HDLC? Explain the frame formats of I-frame, U-frame and S-frame. 
3.a) Derive formula to compute total number of links in a complete mesh network with n nodes.
b) DescribeShannonchannel capacityand Nyquist criteriaapplied to computer network.
c) What is congestion control? How it is different from flow control?
Explain various congestion prevention techniques.
4a)Describe the following in brief.
1) slotted ALOHA 2) CSMAlCD
b) Explain five functions of data-link layer.
5. a) Differentiate forwarding vs. routing. Explain distance vector routing.
b) Write a pseudo code for the following.
i) Encrypt given INPUT.TXT file to ENCRYPT.TXT
ii) Decrypt ENCRYPT.TXT file to ORIGINAL.TXT.
6.a) With the help of suitable diagram, explain how a call is transferred from land line phone to the mobile phone.
b) Differentiate the following. 1) TCP vs. UDP 2) DES vs. RSA
7, Write notes on the following.
2) Digital certificate