IGNOU MCA -mcs-042 solved assignments 2012 -2013

Course Code : MCS-042

Course Title : Data Communication and Computer Network
Assignment Number : MCA (4)/042/Assign/12
Maximum Marks : 100
Weightage : 25%
Last Dates for Submission : 15th October, 2012 (For July 2012 Session)
15th April, 2013 (For January 2013 Session)
This assignment has eight 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: Assume a data stream is made of “000010” Encode this stream using the
following encoding schemes. (10 marks)
(i) Manchester
(ii) Differential Manchester
(iii) UNI polar
(iv) Polar NR Z-1
(v) RZ
Also discuss the usefulness of each scheme.
Q 2: (i) Illustrate constellation diagram of 8- PSK and 8- QAM. (5 marks)
(ii) Given a 10 bit sequence frame: 1001111001 and a divisor (polynomial)
of 1011, Find the CRC. (5 marks)
Q 3: How are problems of Hidden Station and Exposed Station resolved in
wireless LAN? Explain in detail. (10 marks)
Q 4: Explain the 3-way handshake method. How is it different from 2-way
handshake method? (10 marks)
Q 5: How does BGP work? How does it solve the Count to Infinity problem? (10 marks)
Q 6: Explain Diffie Hellman algorithm-with the help of an example. (10 marks)
Q 7: What is the utility of digital certificate? How are these signatures
created? (10 marks)
Q 8: Differentiate between the following: (10 marks)
(i) Leaky Bucket Traffic Shaper and Token bucket Traffic Shaper
(ii) Distance vector routing and Link state routing

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