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Computer Networking

Computer Networking
Data communications system depends on four fundamental characteristics

Receiver
Sender
Medium
Timeliness

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Computer Networking
Which of the following is used for modulation and demodulation?

protocols
gateway
multiplexer
None of these
modem

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Computer Networking
Which of the following conditions is used to transmit two packets over a medium at the same time?

Collision
Synchronous
Asynchronous
Contention
None of these

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Computer Networking
The EIA-232 interface has _____ pins.

24
25
30
20
None of these

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Computer Networking
How many non-overlapping channels are available with 802.11b?

12
3
40
23

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Computer Networking
What is the port number for HTTP?

None of these
86
23
80
99

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