GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VIII (OLD) EXAMINATION — WINTER 2020
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Subject Code:181101 Date:21/01/2021Subject Name:Data Communication And Networking
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Draw the ISO- OSI model and describe the critiques of OSI and TCP/IP reference models. 07
(b) What is the Public Switched Telephone System? Also discussed in details working of PSTN system using diagram. 07
Q.2 (a) Explain flooding and shortest path routing. 07
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(b) What is channel allocation problem? Compare pure ALOHA and Slotted ALOHA. 07Q.3 (a) Explain error correction techniques in detail. 07
(b) Explain the Leaky bucket algorithm and Token bucket algorithm in detail. 07
Q.4 (a) Explain bit map protocol and binary countdown protocol in detail. 07
(b) What is constrain on the window size for selective repeat and Go back n protocol? Justify the answer with example. 07
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Q.5 (a) Differentiate IPv4 and IPv6. Explain Header of IPv6 with diagram. 07
(b) Explain in detail X.25 and Frame relay. 07
Q.6 (a) Explain the SMTP and HTTP protocol. 07
(b) Explain DNS in detail with example 07
Q.7 (a) Discuss various social issues related to security over Internet. 07
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(b) Enlist the function of the transport layer and explain each in brief. Compare UDP and TCP. 07Q.8 (a) What are the elements of transport layer and explain each of them in brief. 07
(b) Which are the methods used for Digital Signature? Explain them in detail. 07
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