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Computer Networking

Computer Networking
How many OSI layers are covered in the X.25 standard?

two
three
six
None of these
seven

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Computer Networking
The Acme Corporation is implementing dial-up services to enable remote-office employees to connect to the local network. The company uses multiple routed protocols, needs authentication of users connecting to the network, and since some calls will be long distance, needs callback support. Which of the following protocols is the best choice for these remote services?

PAP
Frame Relay
802.1
PPP
HDLC

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Computer Networking
If the ASCII character G is sent and the character D is received, what type of error is this?

burst
multiple-bit
recoverable
None of these
single-bit

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

Synchronous
Asynchronous
None of these
Contention
Collision

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Computer Networking
The communication mode that supports two-way traffic but only one direction at a time is

multiplex
half duplex
None of these
simplex
duplex

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Computer Networking
A required characteristic of an online real-time system is:

more than one CPU
no delay in processing
None of these
All of these
offline batch processing

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