University of Mumbai 2003 B.E Information Technology (Computer Network) - Question Paper

N. B. (1) Attempt any 5 ques..
(2) If in doubt make suitable assumption but justify them.
1.a) What is the difference ranging from a protocol and a services interface ?.Explain your ans in terms of the OSI 7 layer model. (10)
b) Consider an fault detecting CRC with the generator 10101. presume the CRC bits follow the data bits in any transmission. (10)
(i) Computer the transmitted bit sequence for the data bit sequence 01101101.
(il) The string of bits 110011001100 is received. Is it acceptable, and if so what is the data bit sequence.
2.(a) discuss the difference of circuit switching, packet switching and message switching using diagram. (10)
(b) Write advantages and disadvantages of connection oriented service with connection less service and write example application. (10)
3.(a) define a scenario in which a TCP connection request is received by a TCP end point but there is infact no corresponding TCP end point who wishes to establish communication with the receiver. (10)
(b) Show how TCP connection setup protects against the situation in (a) Draw the space time diagram for protocol message exchange and discuss how the protocol works. (10)
4.(a) Distinguish ranging from the application and application layer protocol. Use world wide web as an example. (10)
(b) What is the difference ranging from push protocol and pull protocol ? discuss using HTTP and SMTP. (10)
5.(a) discuss the difference of UDP and TCP socket of server side especially when the client initiates the connection or request to the server. (10)
(b) Draw the protocol stack of internet and write protocol data unit (PDU)of every layer. (10)
6.(a) discuss how Ethernet (IEEE 802.3 ) works when 2 or more stations wants to transmit a frame. (10)
(b) How are the, ports numbers used by TCP/or UDP in demultiplexing incoming segments. (10)
7.(a) Which protocol Go- Back- N or Selective - Repeat makes more efficient use of network bandwidth? Why? (10)
(b) Compare IEEE 802.3,802.4, 802.5. (10)
8. (a) discuss stop and wait and sliding window protocol. (10)
(b) one Gbps CSMA/CD LAM is to be designed over 1Km sec. What is the minimum frame size that data Link Layer should be consider. (10)

Earning:   Approval pending.