Data Communication and Networking Questions

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511.

Protocols are

A

Sets of rules

B

Sets of maps

C

Sets of computers

D

Sets of product

Correct Answer: A

Protocols are often described in an industry or international standard. The TCP/IP Internet protocols, a common example, consist of: Transmission Control Protocol (TCP), which uses a set of rules to exchange messages with other Internet points at the information packet level.

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512.

When customers of a Web site are unable to access it due to a bombardment of fake traffic, it is known as:

A

A virus

B

A Trojan Horse

C

Cracking

D

A denial of service attack.

Correct Answer: D

None.

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513.

A single packet on a data link is known as

A

Path

B

Frame

C

Block

D

Group

E

None of the above

Correct Answer: B

A single packet on a data link is known as frame Packet switching. In the OSI model of computer networking, a frame is the protocol data unit at the data link layer. Frames are the result of the final layer of encapsulation before the data is transmitted over the physical layer.

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514.

A technique used by codes to convert an analog signal into a digital bit stream is known as

A

Pulse code modulation

B

Pulse stretcher

C

Query processing

D

Queue management

E

None of the above

Correct Answer: A

Pulse-code modulation is a method used to digitally represent sampled analog signals. It is the standard form of digital audio in computers, compact discs, digital telephony and other digital audio applications.

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515.

A hybrid computer uses a _____ to convert digital signals from a computer into analog signals.

A

Modulator

B

Demodulator

C

Modem

D

Decoder

E

None of the above

Correct Answer: C

Modem : Modem is short for "Modulator / Demodulator." It is a hardware component that allows a computer or other device, such as a router or switch, to connect to the Internet. It converts or "modulates" an analog signal from a telephone or cable wire to a digital signal that a computer can recognize. Similarly, it converts outgoing digital data from a computer or other device to an analog signal.

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516.

Any device that performs signal conversion is

A

Modulator

B

Modem

C

Keyboard

D

Plotter

E

None of the above

Correct Answer: A

Modulator : In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted. ... A modem (from modulator?demodulator) can perform both operations.

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517.

A type of channel used to connect a central processor and peripherals which uses multipling is known as

A

Modem

B

Network

C

Multiplexer

D

All of the above

E

None of the above

Correct Answer: C

A type of channel used to connect a central processor and peripherals which uses multipling is known as Multiplexer.

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518.

Which network is a packet switching network?

A

Ring network

B

LAN

C

Star network

D

EuroNET

E

None of the above

Correct Answer: D

EuroNET network is a packet switching network

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519.

A large number of computers in a wide geographical area can be efficiently connected using

A

Twisted pair lines

B

Coaxial cables

C

Communications satellites

D

All of the above

E

None of the above

Correct Answer: C

A communications satellite is an artificial satellite that relays and amplifies radio telecommunications signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.

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520.

An instruction that transfers program control to one or more possible paths is known as

A

Utility program

B

System software

C

Broadband channel

D

Application program

E

None of the above

Correct Answer: C

Broadband. This refers to high-speed data transmission in which a single cable can carry a large amount of data at once. ... Because of its multiple channel capacity, broadband has started to replace baseband, the single-channel technology originally used in most computer networks.

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