Download GTU BE/B.Tech 2018 Winter 7th Sem New 2171008 Data Communication And Networking Question Paper

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Seat No.: Enrolment No.

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

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1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) What are two reasons for using layered protocols? What is one possible 03 disadvantages of using layered protocols?

(b) Give Comparison among Circuit switching, Packet switching and 04 Message Switching.

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(c) List the Data Link Layer design issues. What is framing? List all 07 methods used for framing and explain any two methods used for framing in detail.

Q.2 (a) Discuss Remote Procedure Call in Transport Layer. 03

(b) Suppose that a message 1001 1100 1010 0011 is transmitted using 04 Internet Checksum (4-bit word). What is the value of the checksum?

(c) Properly Explain the channel allocation problem. Also explain its 07 solution in detail.

OR

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(c) Explain Slotted ALOHA in Detail 07

Q.3 (a) What is the length of a contention slot in CSMA/CD for 03 (1) 2-km twin-lead cable (signal propagation speed is 82% of the signal propagation speed in-vacuum) and (ii) a 40-km multimode fiber optic cable (signal propagation speed is 65% of the signal propagation speed in vacuum).

(b) Explain The Count-to-infinity Problem. 04

(c) Explain The 802.11 Architecture and Protocol Stack. 07

OR

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Q.3 (a) A group of N stations share a 56-kbps pure ALOHA channels. Each 03 station outputs a 1000-bit frame on average once every 100 sec, even if the previous one has not yet been sent (e.g., the stations can buffer outgoing frames). What is the maximum value of N?

(b) Define following: 04 (1) Session Routing (ii) Forwarding (iii) Flooding (iv) Admission Control

(c) Explain in Detail with diagram, Why it is required to define the 07 Maximum and Minimum Frame size of Ethernet? What is Binary Exponential Back off and why it is used in Ethernet?

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Q.4 (a) Assuming that all routers and hosts are working properly and that all 03 software in both is free of all errors, is there any chance, however small, that a packet will be delivered to the wrong destination?

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(b) How Resolver looking up remote name in DNS? 04

(c) Explain Connection Release in Transport Layer. Discuss the Two- 07 army problem and show how to resolve it.

OR

Q.4 (a) Justify the Sentence: “RTP is just another variant of UDP” 03

(b) Consider the network of Fig.1. Distance vector routing is used, and 04 the following vectors have just come in to router C: from B: (5, 0, 8, 12, 6, 2); from D: (16, 12, 6, 0, 9, 10); and from E: (7, 6, 3, 9, 0, 4). The cost of the links from C to B, D, and E, are 6, 3, and 5, respectively. What is C’s new routing table? Give both the outgoing line to use and the cost.

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B C
A D
E F
(Fig. 1)

(c) What is Quality of Service? What is its significance? List the 07 techniques available to improve Quality of Service and Explain any two of them in detail.

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Q.5 (a) Explain Streaming of media using the web and media server. 03

(b) Explain Domain Resource Records. Describe Following DNS 04 Resource Records.

I. cs.vu.nl 86400 IN MX 1 zphyr
II. flits 86400 IN' A 130.37.20.10

(c) What is Digital Signature? List the methods used for Digital 07 Signature and explain them in detail.

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OR

Q.5 (a) How E-mail is delivered from sender to receiver? Explain with 03 diagram.

(b) Explain a multithreaded web server with a font end and processing 04 modules.

(c) Explain the Data Encryption Standard (DES) in details. 07

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