Computer Internet & Networking Short Questions -4

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Computer Internet & Networking Short Questions -4

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Question 1
Encryption and decryption are functions of
A
Transport layer
B
None of these
C
Presentation layer
D
Allot the above
E
Session layer
Question 2
Which type of switching uses the entire capacity of a dedicated link?
A
) Datagram Packet Switch-ing
B
Virtual Circuit Packet Switching
C
Circuit switching
D
Message Switching
Question 3
A peimanent virtual circuit involves
A
All of the above
B
Data transfer
C
Connection release
D
Connection establishment
Question 4
X.21 protocol consists of
A
Only physical level
B
) Frame and packet levels
C
Physical, frame and pack-et levels
D
Physical and frame levels
Question 5
In OSI network architecture, the dialogue control and token management are responsibility of
A
transport layer
B
network layer
C
) session layer
D
data link layer
Question 6
In OSI network architecture, the routing is performed by
A
data link layer
B
network layer
C
transport layer
D
session layer
Question 7
Which of the following performs modulation and demodulation?
A
modem
B
satellite
C
coaxial cable
D
fiber optics
Question 8
The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as:
A
modulation
B
digitising
C
synchronizing
D
demodulation
Question 9
How many OSI layers are covered in the X.25 standard?
A
Two
B
Seven
C
Three
D
Six
Question 10
Layer one of the OSI model is
A
transport layer
B
link layer
C
physical layer
D
network layer
Question 11
. The x.25 standard specifies a
A
technique for start-stop data
B
technique for dial access
C
data bit rate
D
DTE/DCE interface
Question 12
Which of the following communication modes support -two-way traffic but in only one direction at a time?
A
half duplex
B
simplex
C
three-quarters duplex
D
all of the above
Question 13
Wh ch of the following might be used by a company to satisfy following communications needs?
A
front end processor
B
all of the above
C
controller
D
concentrator ,,
Question 14
The interactive transmission of data within a time sharing system may be best suited to
A
simplex lines
B
biflex-lines
C
full duplex lines
D
half-duplex lines
Question 15
Which of the following statement is incorrect?
A
Batch processing is the prefered processing mode for telecommunication operation.
B
Half duplex line is a communication line in which data can move in two directions, but not at the same time.
C
Teleprocessing combines telecommunications and DP techniques in online activities
D
The difference between synchronous and asynchronous trans mission is the clocking derived from the data in synchronous transmission.
Question 16
Which of hte fallowing is considered a broad band communication channel?
A
coaxial cable
B
fiber optics cable
C
all of above
D
microwave circuits
Question 17
Which of the following is not a transmission medium?
A
) telephone lines
B
modem
C
coaxial cables
D
microwave systems
Question 18
Which of the following signal is not standard RS 232-C signal?
A
CIS
B
RTS
C
VDR
D
DSR
Question 19
Which of the following is an advantage to using fiber optics data transmission?
A
resistance to data theft
B
fast data transmission rate
C
all of above
D
low noise level
Question 20
Which of the following is required to communicate between two computers?
A
all of above including access to transmission medium
B
protocol
C
communication hardware
D
communications software
Question 21
The transmission signal coding method of Tl carrier is called
A
NRZ
B
Bipolar
C
Manchester
D
Binary
Question 22
Which data communication method is used to transmit the data over a serial communication link?
A
simplex
B
half-duplex
C
None of above
D
band c
E
full-duplex
Question 23
. What is the minimum number of wires needed to send data over a serial communication link layer?
A
2
B
1
C
4
D
6
Question 24
Which of the following types of channels moves data relatively slowly?
A
narrow band channel
B
voice band challen
C
wide band channel
Question 25
Most data communications involving telegraph lines use:
A
simplex lines
B
wideband channel
C
dialed service
D
narrowband channel
Question 26
A communications device that combines transmissions from several I/O devices into one line is a
A
concentrator
B
modifier
C
full-duplex line
D
multiplexer
Question 27
How much power (roughly) a light emitting diode can couple into an optical fiber?
A
100 picowatts
B
440 microwatts
C
100 microwatts
D
10 miliwatts
Question 28
The synchronous modems are more costly than the asynchronous modems because
A
they contain clock recovery circuits
B
they produce large volume of data
C
they transmit the data with stop and start bits
D
they operate with a larger bandwidth
Question 29
Which of the following statement is correct?
A
terminal section of a synchronous modem contains the scrambler
B
transmission section of a synchronous modern contains the scrambler
C
receiver section of a synchronous modem contains the scrambler
D
) control section of a synchronous modem contains the scrambler
Question 30
. In a synchronous modem, the digital-to-analog converter transmits signal to the
A
demodulator
B
modulator
C
equilizer
D
terminal
There are 30 questions to complete.

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