Rajiv Gandhi Technical University Bhopal B.E. (5th Semester) Exam,Dec-2011 (Information Technology Engg. Branch) COMPUTER NETWORKS-(IT-503)
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Rajiv Gandhi Technical University Bhopal
B.E. (5th Semester) Exam,Dec-2011
(Information Technology  Engg. Branch)
COMPUTER NETWORKS-(IT-503)
Time : Three Hours   Max Marks : 100  Min Pass Marks : 35
Note: Attempt one question from each Unit. All questions carry equal marks
Unit-I
1. (a) What is the difference between connection oriented communication & connectionless communication?Explain the types of service.What are service primitives ? 10
    (b) What are the advantages and disadvantages of having international standards for network protocols? 10
Or
2. (a) What is the difference between confirmed service and unconfirmed service ? For each of the following, tell whether it might be a confirmed service and unconfirmed service both or neither 10
  1. Data transmission
  2. Connection release
  3. Connection establishment
    (b) Explain the following : 10
  1. Virtual terminal protocol
  2. Negotiation in discussing network protocol 
Unit-II
3. (a) Explain the framing methods in data link layer. Which one of these uses code violations to mark frame boundaries ?  10
    (b) A channel has a bit rate of 4 kbps and propagation delay of 20 m sec. For what range of frame sizes does stop and wait give an efficiency of at least 50% ?  10
                                                                                Or
4. (a) If the bit string 0111101111101111110 is subjected to bit stuffing, what is the output of string ?  5
     (b) For P = 110011 and M = 11100011, find the CRC. 5
     (c) Consider the use of 1000 bit frames on a 1 Mbps satellite channel with 270 ms delay. What is the maximum link utilization for : 10
  1. Stop and wait flow control.
  2. Continuous flow control with window size 7.
  3. Continuous flow control with window size 1277. 
Unit-III
5. (a) Compare the capacity allocation schemes for IEEE 8025 token ring and FDDI. What are the relative pros and cons? 10
    (b) Explain persistent and non-persistent CSMA. 10
                                                                                Or
6. (a) Explain CSMA/CD protocol. Also discuss about collision free protocols. 10
     (b) For a token ring, LAN, suppose that the destination station removes the data frame and immediately sends a short acknowledgement frame to the sender, rather than letting the original frame return to sender. How will this affect performance ?  10
Unit-IV
7. (a) Explain the two classes of routing algorithms :10
  1. Adaptive algorithms
  2. Non-adaptive algorithm
  3. Discuss about multipath routing. 
     (b)Explain OSI connection oriented network service primitives. 10
                                                                                Or
8. (a) Compare virtual circuit and datagram with in a subnet. 10
    (b) What is the difference, if any, between static routing using two equally weighted alternatives and selective flooding using only the two best paths ? Justify your answer. 10
Unit-V 
9. (a) Explain the issue of addressing, multiplexing and flow control in connection oriented transport protocol mechanisms.10 
    (b) Why is UDP needed ? Why can't user program directly access IP?10
Or 
10. (a) Compare TCP and OSI Class 4 transport protocol. 1 
       (b) Write notes on the configuration of the following Networking devices :  10
  1. Switches
  2. Bridges
  3. Hubs
  4. Gateway
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