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Computer Networking

Computer Networking
What is the port number for POP3?

90
80
110
49

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Computer Networking
What function does a serial interface perform in data communication?

Decodes incoming signals into computer data
Converts serial data into audio signals
None of these
Converts analog signals into digital signals
Converts parallel data into a stream of bits

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Computer Networking
Who invented the modem?

AT & T Information Systems, USA
Wang Laboratories Ltd.
Apple Computers Inc.
None of these
Digital Equipment Corpn.

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Computer Networking
Which of the following types of channels moves data relatively slowly?

wideband channel
voiceband channel
narrowband channel
None of these
broadband channel

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Computer Networking
Which of the following files is used for NetBIOS name resolution?

None of these
LMHOSTS
ARP
HOSTS
FQDN

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Computer Networking
The synchronous modems are more costly than the asynchronous modems because

they transmit the data with stop and start bits.
they produce large volume of data
they contain clock recovery circuits
they operate with a larger bandwidth
None of these

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