M.Sc. (Semester III) (CBCS) Examination Nov/Dec-2018
Electronic Science
DATA COMMUNICATION AND NETWORKING
Time: 2½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
Figures to the right indicate full marks.
Use of nonprogrammable calculator is allowed.
Q.1 Select the most correct alternative 14
What does A in ADSL stand for
Alternative Asynchronous
Attenuated Asymmetric
Which of the following is a physical layer device?
Switch Bridge
Repeater Router
A dedicated physical link between two hosts is said to be
Mesh Link Shared Link
Simplex Point-to point
Which of following protocol provides file sharing?
Telnet SMTP
UDP FTP
The is a country specific domain name.
.com .org
.us .pro
is used on IEEE-802.3 networks in order to obtain ethernet
address from IP address.
ARP RARP
ICMP IGMP
is a bit oriented protocol.
HDLC FTP
SMTP PPP
protocol does not scale well to networks with thousands of
stations.
Bit map Binary Countdown
Limited Contention Adaptive Tree Walk
multiple access protocol is used for doubling the capacity of
ALOHA.
Slotted ALOHA Pure ALOHA
CSMA CSMA/CD
10) The TCP/IP model has numbers of layer.
7 5
4 8
Page 2 of 2
SLR-VH-243
11) Segmentation of a data stream happens at which layer of the OSI model?
Physical Network
Transport Session
12) ADSL gives
Faster downloading speeds (receiving) than uploading speeds
(sending).
Slower downloading speeds (receiving) than uploading speeds
(sending).
Same downloading speeds (receiving) as uploading speeds (sending).
None of the above
13) Bluetooth is an example of
Personal area network Local area network
Virtual private network None of the mentioned
14) Packet is a data unit of layer.
Physical Data link
Network Transport
Q.2 Answer the following. (Any Four) 08
Differentiate between router and repeater.
What is UDP?
What is point to point and multi-point connection?
List out the advantages and drawbacks of mesh topology.
What is modem?
Answer the following. (Any Two) 06
What is piggybacking technique?
What is LAN? State its advantages and disadvantages.
What is ARP? When it is used?
Q.3 Answer the following (Any Two) 08
Explain the need and applications of computer networking.
Explain token bucket algorithm.
Explain error correction using Hamming code.
Answer the following (Any One) 06
What is IP addressing? How it is classified? How subnet addressing is
performed.
With a neat sketch, describe working of Datagram subnet.
Q.4 Answer the following (Any Two) 10
With a neat sketch, explain pure ALOHA.
Write a short note DNS.
Briefly describe the working of sliding window protocol.
Answer the following (Any One) 04
Explain dynamic channel allocation problem with its five assumptions.
Explain congestion control in TCP.
Q.5 Answer the following (Any Two) 14
Explain TCP/IP Model in detail.
Explain the following guided media in detail.
Co-axial cable
ii) Twisted pair cable
Discuss about high level data link protocol (HDLC) in detail.