GTU BE 2020 Summer Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- IV EXAMINATION — SUMMER 2020
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Subject Code: 2140709 Date: 02/11/2020
Subject Name: COMPUTER NETWORKS
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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| Q.1 | (a) | Differentiate between Connection oriented and Connectionless services. | 03 |
| (b) | List out & discuss various types of addresses used in internetworking. | 04 | |
| (c) | Draw & explain the Internet protocol stack. Write down various duties performed by each layer. | 07 | |
| Q.2 | (a) | What is the role of Domain Name Server (DNS) in Internet? | 03 |
| (b) | Compare UDP with TCP. | 04 | |
| (c) | Draw & explain general format of two different types of HTTP message. | 07 | |
| OR | |||
| (c) | List out & discuss in detail various physical media used for accessing the network. | 07 | |
| Q.3 | (a) | Compare Go-Back-N ARQ with Selective Repeat ARQ. | 03 |
| (b) | How UDP checksum value is calculated? Explain with suitable example. | 04 | |
| (c) | Draw & explain each field of TCP segment header. | 07 | |
| OR | |||
| (c) | Compare flow control with congestion control. | 07 | |
| Q.4 | (a) | Explain the concept of pipelining in brief. List any two pipelined RDT protocols. | 03 |
| (b) | Explain TCP congestion control algorithm with the help of following terms & suitable diagram:
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| (c) | Compare virtual-circuit networks with datagram networks. | 07 | |
| OR | |||
| (c) | Briefly explain the terms: CIDR & classful addressing. | 07 | |
| Q.5 | (a) | Draw & explain each field of IPv4 datagram. | 03 |
| (b) | Differentiate between the forwarding and the routing. | 04 | |
| (c) | What is the role of routing algorithms at network layer? Illustrate the operation of Distance Vector routing algorithm for the simple 3-node network. | 07 | |
| OR | |||
| (c) | Justify how slotted ALOHA is better than pure ALOHA. | 07 | |
| Q.6 | (a) | How DHCP works? Explain in brief. | 03 |
| (b) | Draw Ethernet frame structure and explain each field in detail. | 04 | |
| (c) | Compare physical LAN with virtual LAN. | 07 | |
| OR | |||
| (c) | How ARP works? Explain in brief. | 07 | |
| Q.7 | (a) | Given the dataword 1010101010 and the divisor 10101,
| 07 |
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