Computer Networking
Which of the following best illustrates the default subnet mask for a class A,B, and C Network?

None of these
0.0.0.0, 0.0.0.1, 0.0.1.1
255.255.255.0, 255.255.0.0, 255.0.0.0
255.0.0.0, 255.255.0.0, 255.255.255.0
255.255.0.0, 255.255.255.0, 255.255.255.255

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Computer Networking
Parity bit is

a check bit appended to an array of binary digits to make the sum of all the binary digits.
the ratio of the number of data units in error to the total number of data units
None of these
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and
an error-detecting code based on a summation operation performed on the bits to be checked.

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Computer Networking
What is route poisoning?

It sends back the protocol received from a router as a poison pill, which stops the regular updates.
It prevents regular update messages from reinstating a route that has just come up.
It describes when a router sets the metric for a downed link to infinity.
It is information received from a router that can't be sent back to the originating router.

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