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Exam 200-120 Question id=38 IP Routing Technologies

Which statement is true, as relates to classful or classless routing?

A. Classful routing protocols send the subnet mask or masklen in routing updates.
B. RIPv1 and OSPF are classless routing protocols.
C. Automatic summarization at classful boundaries can cause problems on discontiguous subnets.
D. EIGRP and OSPF are classful routing protocols and summarize routes by default.
E. IGRP and OSPF are classfull routing protocols.

RIPv1, RIPv2, IGRP, and EIGRP are classful routing protocols.
OSPF, IS-IS and BGP are classless routing protocols.