Computer Network - May 2012

Computer Engineering (Semester 5)

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) With the neat diagram compare the uses and functions of different hardware components/ devices in an internetwork.(10 marks) 1(b) Compare virtual circuits and datagram subnets and show their diagrammatic representation during congestion control. (10 marks) 2(a) What are the advantages of variable length frame over fixed length frames. Explain the different framing methods. (10 marks) 2(b) Explain FDMA, TDMA and CDMA. (10 marks) 3(a) Derive the efficiency of pure ALOHA protocol. (10 marks) 3(b) A receiver receives the code 11001100111. When it applies the hamming code algorithm the result is 0101. Which bit has the error? What is the correct hamming code? (10 marks) 4(a) Describe the IPV4 header format in detail.(10 marks) 4(b) Explain the three protocol scenarios for establishing a connection using a 3-way handshake in TCP. (10 marks) 5(a) Explain DVR routing algorithm and mention the drawbacks of the algorithm when put into practice. (10 marks) 5(b) Explain the working of Transactional TCP. (10 marks) 6(a) List the design features to be taken care of as congestion prevention policies in the different layers of network(10 marks) 6(b) Draw the layered structures and compare the two network reference models ? OSI and TCP/IP. (10 marks)

Write short notes on (any two) of the following:

7(a) SONET(10 marks) 7(b) Ethernet frame formats(10 marks) 7(c ) ADSL(10 marks) 7(d) Satellite Communication(10 marks)