M.Sc. (Semester III) (CBCS) Examination Oct/Nov-2017
Electronics Science
DATA COMMUNICATION NETWORKING
Day Date: Tuesday, 21-11-2017 Max. Marks: 70
Time: 02.30 PM to 05.00 PM
Instructions: Q.1 and Q.2 are compulsory.
Attempt any three questions from Q. 3 to Q.7.
Figures to the right indicate full marks.
Use of non-programmable calculator is allowed.
Q.1 Select the correct alternative: 06
Which data unit is used in transport layer?
Bit Frame
Packet Segment
Logical address to physical address translation performs at which layer
of the OSI model?
Physical Network
Data link Session
Protocol is useful for error control as well as flow
control.
Stop and Wait Selective Reject
Simplex Selective Repeat
Which of the following protocol provides file sharing?
Telnet SMTP
UDP FTP
The is a country specific domain name.
.com .org
.us .pro
acts as a point of connection which connects segments of
transmission medium.
Hub NIC
Modem Ethernet
Q.1 State true and false 08
Point to point line configuration provides dedicated link between two
devices.
A bridge operates at the data link layer of the OSI model.
ALOHA protocol does not try to detect whether the channel is free
before transmitting.
IGMP is used on IEEE-802.3 networks in order to obtain Ethernet
address from IP address.
Subnet is made up of telecommunication lines (i.e. circuits, channels,
trunks) and switching elements.
A computer communication technology that provides a way to
interconnect multiple computer across long distance is LAN.
Coaxial cable provides better shielding than Twisted pair cable.
HDLC is very similar to the SDLC synchronous data link protocol.
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SLR-MH-332
Q.2 Attempt the following:- 14
Explain the static channel allocation problem in LAN and MAN. 05
Explain flow control in data link layer. 05
State and explain the features of CSMA. 04
Q.3 With a neat sketch, explain operation of cable modem. State its advantages
and disadvantages.
08
Explain pure ALOHA multiple access protocol in detail. 06
Q.4 Describe OSI model in computer communication network. 10
State features of coaxial cable. 04
Q.5 What is framing? Explain the following framing techniques:-
Character count
Bits stuffing
10
Define the following terms:-
Router
Switch
Hub
Repeater
04
Q.6 Discuss about following categories of network detail.
LAN
WAN
08
What are the types of frames available in high level data link protocol

06
Q.7 What is TCP? Explain TCP protocol with its header format. 10
Write a short note on token bucket algorithm. 04