IGNOU MCA MCS-042 Data Communication and Computer Network SOLVED ASSIGNMENTS 2014-2015 IV FOURTH SEMESTER
Course Code : MCS-042
Course Title : Data Communication and Computer Network
Assignment Number : MCA (4)/042/Assign/2014-15
Maximum Marks : 100
Weightage : 25%
Last Dates for Submission : 15th October, 2014 (For July 2014 Session)
15th April, 2015 (For January 2015 Session)
This assignment has nine questions. Answer all questions. Rest 20 marks are for viva voce. You may use illustration and diagrams to enhance the explanations. Please go through the guidelines regarding assignments given in the Programme Guide for the format of presentation.
Q.1. Derive expressions for throughput in Aloha and slotted Aloha protocols. Show the vulnerability period of Aloha and also load vs. through graph for Aloha and slotted Aloha.
Q.2. Explain functioning of the following protocols with the help of a diagram. 3 bit sequence numbers are used. Go back N Selective Repeat
How these two protocols are different from stop and wait protocols?
Q.3. A bit stream 101010101101 transmitted using standard CRC method. The generator polynomial is x4 +1. Show the actual bit string transmitted. Suppose the fourth bit from the left is inverted during transmission. Show that this error is detected at the receiver’s end.
Q.4. Sketch the Manchester and differentiate Manchester encodings for the bit stream: 100111010101
Q.5. Explain the Ethernet frame format. Why there is a requirement of maximum and minimum Ethernet frame length?
Q.6. How is OSPF implemented in IP network? Illustrate.
Q.7. Consider the following network with the indicated link cost. Use Dijkstra’s and Bellman’s shortest path algorithm to find the shortest path from source node A to all other nodes.
figure refer - click here
Q.8. What are the benefits of using digital certificate?
Q.9. How does TCP 3-way handshake mechanism handle the following: (i) Delayed arrived and SYN packets (ii) Delayed ACK Packet
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