Computer Internet & Networking Short Questions -4

internet-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