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Computer Networking

Computer Networking
Which of the following describes the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols?

VPN
IPSec
HDLC
Cable
xDSL

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Computer Networking
Eight stations are competing for the use of the shared channel using the modified Adaptive free walk protocol by Gallager. If the stations 7 and 8 are suddenly become ready at once, how many bit slots are needed to resolve the contention?

14 slots
None of these
10 slots
5 slots
1 slots

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Computer Networking
Which of the following communications service provides message preparation and transmission facilities?

Fax
Teletext
Teletex
x400
None of these

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Computer Networking
The most flexibility in how devices are wired together is provided by

ring networks
star networks
None of these
bus networks
T-switched networks

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Computer Networking
A smart modem can dial, hang up and answer incoming calls automatically. Can you tell who provides the appropriate instruction to the modem for this purpose?

None of these
Link access procedure (LAP)
Error detecting protocols
Telecommunications
Communications software

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Computer Networking
What type of RJ45 UTP cable is used between switches?

Crossover with a router in between the two switches
Crossover cable
Crossover with a CSU/DSU
Straight-through

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