Discussion
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.
Answer: C
Correct answer: 2 and 5
A classless protocol carries the subnet mask in its updates, which is what permits variable length subnet masks and discontiguous networks - so statement 2 is correct and statement 1 states the opposite. RIPv2 is classless, so statement 5 is correct. RIPv1 and IGRP are both classful and send no mask, which disposes of statements 3 and 4.
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