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