Computer Networking
Which statement is true regarding classless routing protocols?1. The use of discontiguous networks is not allowed.2. The use of variable length subnet masks is permitted.3. RIPv1 is a classless routing protocol.4. IGRP supports classless routing within the same autonomous system.5. RIPv2 supports classless routing.

1, 3 and 5
None of these
2 and 5
3 and 4

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Computer Networking
X.21 is

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

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