Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2171008 Data Communication And Networking Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2171008 Date: 03/12/2018
Subject Name: Data Communication and Networking
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
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
disadvantages of using layered protocols?
03
(b) Give Comparison among Circuit switching, Packet switching and
Message Switching.
04
(c) List the Data Link Layer design issues. What is framing? List all
methods used for framing and explain any two methods used for
framing in detail.
07
Q.2 (a) Discuss Remote Procedure Call in Transport Layer. 03
(b) Suppose that a message 1001 1100 1010 0011 is transmitted using
Internet Checksum (4-bit word). What is the value of the checksum?
04
(c) Properly Explain the channel allocation problem. Also explain its
solution in detail.
07
OR
(c) Explain Slotted ALOHA in Detail 07
Q.3 (a) What is the length of a contention slot in CSMA/CD for
(i) 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).
03
(b) Explain The Count-to-infinity Problem. 04
(c) Explain The 802.11 Architecture and Protocol Stack. 07
OR
Q.3 (a) A group of N stations share a 56-kbps pure ALOHA channels. Each
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?
03
(b) Define following:
(i) Session Routing (ii) Forwarding (iii) Flooding (iv) Admission
Control
04
(c) Explain in Detail with diagram, Why it is required to define the
Maximum and Minimum Frame size of Ethernet? What is Binary
Exponential Back off and why it is used in Ethernet?
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2171008 Date: 03/12/2018
Subject Name: Data Communication and Networking
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
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
disadvantages of using layered protocols?
03
(b) Give Comparison among Circuit switching, Packet switching and
Message Switching.
04
(c) List the Data Link Layer design issues. What is framing? List all
methods used for framing and explain any two methods used for
framing in detail.
07
Q.2 (a) Discuss Remote Procedure Call in Transport Layer. 03
(b) Suppose that a message 1001 1100 1010 0011 is transmitted using
Internet Checksum (4-bit word). What is the value of the checksum?
04
(c) Properly Explain the channel allocation problem. Also explain its
solution in detail.
07
OR
(c) Explain Slotted ALOHA in Detail 07
Q.3 (a) What is the length of a contention slot in CSMA/CD for
(i) 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).
03
(b) Explain The Count-to-infinity Problem. 04
(c) Explain The 802.11 Architecture and Protocol Stack. 07
OR
Q.3 (a) A group of N stations share a 56-kbps pure ALOHA channels. Each
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?
03
(b) Define following:
(i) Session Routing (ii) Forwarding (iii) Flooding (iv) Admission
Control
04
(c) Explain in Detail with diagram, Why it is required to define the
Maximum and Minimum Frame size of Ethernet? What is Binary
Exponential Back off and why it is used in Ethernet?
07
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2
Q.4 (a) Assuming that all routers and hosts are working properly and that all
software in both is free of all errors, is there any chance, however
small, that a packet will be delivered to the wrong destination?
03
(b) How Resolver looking up remote name in DNS? 04
(c) Explain Connection Release in Transport Layer. Discuss the Two-
army problem and show how to resolve it.
07
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
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.
(Fig. 1)
04
(c) What is Quality of Service? What is its significance? List the
techniques available to improve Quality of Service and Explain any
two of them in detail.
07
Q.5 (a) Explain Streaming of media using the web and media server. 03
(b) Explain Domain Resource Records. Describe Following DNS
Resource Records.
I. cs.vu.nl 86400 IN MX 1 zphyr
II. flits 86400 IN A 130.37.20.10
04
(c) What is Digital Signature? List the methods used for Digital
Signature and explain them in detail.
07
OR
Q.5 (a) How E-mail is delivered from sender to receiver? Explain with
diagram.
03
(b) Explain a multithreaded web server with a font end and processing
modules.
04
(c) Explain the Data Encryption Standard (DES) in details.
07
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This post was last modified on 20 February 2020