Chapter 20
1. B, C, and D. Classless routing protocols, by definition, support VLSM because classless routing protocols transmit the subnet mask in their routing updates. Of the listed answers, only RIP version 1 (RIP-1) is not a classless routing protocol.
2. A. Note that sometimes VLSM stands for variable-length subnet masking, which refers to the process of using different masks in the same classful network, whereas variable-length subnet mask refers to the subnet masks themselves.
3. A. Subnet 10.5.0.0 255.255.240.0 implies range 10.5.0.0–10.5.15.255, which does not overlap. 10.4.0.0 255.254.0.0 implies range 10.4.0.0–10.5.255.255, which does overlap. 10.5.32.0 255.255.224.0 implies range 10.5.32.0–10.5.63.255, which does overlap. 10.5.0.0 ...
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