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Computer Networking

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

None of these
4
3
6
2

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Computer Networking
Which of the following device is used to connect two systems, especially if the systems use different protocols?

bridge
None of these
hub
gateway
repeater

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Computer Networking
Which of the following file retrieval methods use hypermedia?

Archie
None of these
Veronica
WAIS
HTTP

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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

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

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Computer Networking
In a synchronous modem, the digital-to-analog converter transmits signal to the

None of these
terminal
equalizer
demodulator
modulator

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Computer Networking
A group of 2m - 1 routers are interconnected in a centralized binary tree, with router at each tree node. Router I communicate with router J by sending a message to the root of the tree. The root then sends the message back down to J. Then find the mean router-router path length.

2 (2m - 1)
2 (m - 2)
(2m - l)/mJ
m - 1

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