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Computer Networking

Computer Networking
Which of the following network access standard is used for connecting stations to a circuit-switched network?

X.25
X.21
X.75
None of these
X.3

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Computer Networking
The basic Ethernet design does not provide

automatic retransmission of a message
access control
multiple virtual networks
addressing
None of these

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Computer Networking
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?

None of these
Electronic mail
Facsimile
Telex
Word processor

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Computer Networking
An error-detecting code inserted as a field in a block of data to be transmitted is known as

Checksum
None of these
flow control
Error detecting code
Frame check sequence

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Computer Networking
Many data communication networks have been established which provide a wealth of on-demand information services to people at home. What is the name of the system which provides an interactive, graphics-rich service that permits user to select what they want?

Fax system
Videotex system
Microwave system
Teletex system
None of these

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Computer Networking
Which of the following protocols uses both TCP and UDP?

DNS
Telnet
FTP
SMTP

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