单选题Which statement is true，as relates to classful or classless routing？（）ARIPV1 and OSPF are classless routing protocols.BClassful routing protocols send the subnet mask in routing updates.CAutomatic summarization at classful boundaries can cause problems on disc……DEIGRP and OSPF are classful routing protocols and summarize routes by def……
单选题
Which statement is true，as relates to classful or classless routing？（）
A
RIPV1 and OSPF are classless routing protocols.
B
Classful routing protocols send the subnet mask in routing updates.
C
Automatic summarization at classful boundaries can cause problems on disc……
D
EIGRP and OSPF are classful routing protocols and summarize routes by def……
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