Computer Networking
You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which classful subnet mask would you use?

255.255.255.240
255.255.255.224
255.255.255.192
255.255.255.248

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Computer Networking
In geosynchronous orbit, satellite

remains in a fixed position so that as earth rotates, it can fully cover the earth
None of these
moves simultaneously
remains in a fixed position related to points on earth
moves faster than the earth's rotation so that it can cover larger portion of earth.

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Computer Networking
Which of the following refers to the terms "residual error rate"?

the probability that one or more errors will be detected when an error detection mechanism is used
None of these
signal to noise ratio divided by the ratio of energy per bit to noise per hertz
The probability that one or more errors will be undetected when an error detection scheme is used
the number of bit errors per twenty four hours of continuous operation on an asynchronous line

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Computer Networking
Contention is

One or more conductors that serve as a common connection for a related group of devices
a collection of interconnected functional units that provides a data communications service among stations attached to the network
a continuous frequency capable of being modulated or impressed with a second signal
None of these
the condition when two or more stations attempt to use the same channel at the same time

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