Computer Network Set B
1. Which of these is correct for synchronous Time Division Multiplexing
a.
Data rate of link is n times faster and the unit duration is n times longer
b.
Data rate of link is n times slower and the unit duration is n times shorter
c.
Data rate of link is n times slower and the unit duration is n times longer
d.
Data rate of link is n times faster and the unit duration is n times shorter
2.
In TDM Data rate management is done by which of these strategies
a.
Multilevel multiplexing
b.
Multi-slot allocation
c.
Pulse stuffing
d.
all of the above
3.
UTP Cat-5 cable normally 24 AWG with a jacket and outside sheath used at data rate
a.
100 Mbps in LANS
b.
1 Gbps in LANs
c.
100 Mbps in WANS
d.
1 Gbps in WANs
4.
What is an SSTP?
a.
Simple Shielded Twisted Pair
b.
Screened Shielded Twisted Pair
c.
Single Shielded Twisted Pair
d.
Solid Shielded Twisted Pair
5.
Bayone-Neill-Concelman(BNC) connectors are used with which type of cables
a.
UTP
b.
STP
c.
Coaxial cable
d.
Optical Cables
6.
In multimode graded-index fiber, the word index refers to
a.
index of reflection
b.
index of refraction
c.
index density of optical material
d.
b or c
7.
which type of EM waves are used for unicast communication such as cellular telephones, satellite networks
and wireless LANS.
a.
Infrared
b.
Microwaves
c.
Radio waves
d.
light waves
8.
Which of these is not an advantage of Optical fibers
a.
easy installation and maintenance
b.
Immune to electromagnetic interference
c.
Less signal attenuation
d.
greater immunity to tapping
9.
Which of these Electro-Magnetic waves is used for short range and line of propagation communications
a.
Radio waves
b.
Microwaves
c.
Infrared signals
d.
None of the above
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Computer Network Set B
10.
11.
12.
13.
14.
15.
What happens to destination address in the header of a packet in a datagram network ?
a.
It remains same during the entire journey.
b.
Updated by every switching device on the way.
c.
same till the gateway of the parent network and updated by gateway for the internet
d.
none of these.
Which of these are the features of ADSL?
a.
symmetric, adaptive and bandwidth upto 1.1 MHz
b.
asymmetric, adaptive and bandwidth upto 1.1 MHz
c.
asymmetric, non-adaptive and bandwidth upto 1.1 MHz
d.
symmetric, non-adaptive and bandwidth upto 1.1 MHz
In stop and wait ARQ, the sequence numbers are generated using
a.
Modulo-16 arithmetic
b.
Modulo-8 arithmetic
c.
Modulo-4 arithmetic
d.
Modulo-2 arithmetic
In go-back-N protocol the how many times a send window can slide when a valid acknowledgement arrives
a.
One
b.
Two
c.
One or more
d.
none of above
Which of these is true for go-back-N protocol, if m is the size of sequence number field
a.
size of send window must be less than 2m and size of receiver window must be 1
b.
size of send window must be greater than 2m and size of receiver window must be 1
c.
size of send window must be less than 2m and size of receiver window must be 2m
d.
size of send window must be greater than 2m and size of receiver window must be 2m
Which of these is true for selective-repeat protocol , if m is the size of sequence number field
a.
size of sender and receiver window must be less than 2m
b.
size of sender and receiver window must be greater than 2m
c.
size of sender and receiver window must be at most one half of 2m
d.
size of sender and receiver window must be at least one half of 2m
Answers1-d
2-d
3-a
4-b
5-c
6-d
7-b
8-a
9-c
10-a 11-b 12-d
13-c
14-a
15-c
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