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Q.

What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?

A

4

B

2

C

6

D

3

E

None of the above

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MCQ

1.

After coding a document into a digital signal, it can be sent by telephone, telex or satellite to the receiver where the signal is decoded and an exact copy of the original document is made. What is it called?

A

Telex

B

Word processor

C

Facsimile

D

Electronic mail

E

None of the above

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2.

Which of the following program is used to copy files to or from another UNIX timesharing system over a single link?

A

VMTP

B

TFTP

C

UUCP

D

UART

E

None of the above

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3.

Which network is a cross between circuits switched network and a data-gram network?

A

Circuit-switched network

B

Virtual-circuit network

C

Virtual-circuit identifier

D

None of these

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4.

Unmodulated signal coming from a transmitter is know as

A

Carrier signal

B

Baseband signal

C

Primary signal

D

None of these

Discussion

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5.

The cheapest modems can transmit

A

300 bits per second

B

1,200 bits per second

C

2,400 bits per second

D

4,800 bits per second

E

None of the above

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