GTU BE 2020 Summer Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VIII EXAMINATION — SUMMER 2020
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Subject Code: 2171008 Date: 29/10/2020
Subject Name: DATA COMMUNICATION AND NETWORKING
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Marks | |
|---|---|
| Q.1 (a) Compare PAN, LAN, MAN, & WAN in terms of geographical area covered. | 03 |
| (b) Compare circuit switching and packet switching with suitable diagram. | 04 |
| (c) Draw the OSI reference model. Write down various duties performed by each layer. | 07 |
| Q.2 (a) Compare Go-Back-N & Selective Repeat ARQ protocols. | 03 |
| (b) List out various framing techniques. Explain any one with suitable example. | 04 |
| (c) List out and explain variants of CSMA protocol in brief. | 07 |
| OR | |
| (c) Given the dataword 1010101010 and the divisor 10101, | 07 |
| 1. Show the generation of codeword at the sender site. | |
| 2. Show the generation of dataword at receiver site (assuming no errors). | |
| Q.3 (a) Justify how slotted ALOHA is better than pure ALOHA. | 03 |
| (b) Write a note on “the role of MAC sublayer in LANs”. | 04 |
| (c) List out and explain various connecting devices: | 07 |
| OR | |
| Q.3 (a) Compare UDP & TCP. | 03 |
| (b) What is CIDR? Explain in brief. | 04 |
| (c) What is the role of routing algorithms at network layer? Explain Distance Vector routing algorithm in detail. | 07 |
| Q.4 (a) Explain TCP connection establishment process with neat figure. | 03 |
| (b) Draw UDP header. List out the applications where UDP is useful. | 04 |
| (c) Draw & explain each field of IPv4 header. | 07 |
| OR | |
| Q.4 (a) Compare flow control & congestion control. | 03 |
| (b) Briefly explain virtual LAN. | 04 |
| (c) Draw & explain each field of TCP header. | 07 |
| Q.5 (a) Compare private -key & public-key algorithms. | 03 |
| (b) How HTTP works? Explain in brief. | 04 |
| (c) Write a short note on the JPEG standard. | 07 |
| OR | |
| Q.5 (a) Draw general outline of DES algorithm. | 03 |
| (b) Write a brief note on working of E-mail using SMTP. | 04 |
| (c) Write a detailed note on firewall. | 07 |
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