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

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

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Computer Networking
X.21 is

a method access control technique for multiple-access transmission media
None of these
a method of determining which device has access to the transmission medium at any time
a very common bit-oriented data link protocol issued by ISO
network access standard for connecting stations to a circuit-switched network

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