... => 5 host bits => 30 hosts4. B, D. VLSM is compatible only with classless routing protocols. Classless routing protocols have the ability to carry subnet informa-tion in their route advertisements. ... is not compatible with IGRP, because IGRP is a classful routing protocol, meaning that it does not carry sub-net information in its routing updates.19. D. With 25 bits of subnetting, we have ... designing your network sum-marization points: Only classless routing protocols support route summarization. Exam-ples of classless routing protocols include RIPv2, EIGRP, and OSPF. Therefore,...