单项选择题
A. The ip classless command is enabled by default in recent versions of IOS.
B. The ip classless command should only be enabled when static routing is being used instead of a routing protocol.
C. The ip classless command should be enabled by the network administrator whenever RIPv1 or IGRP is being used.
D. The ip classless command should be enabled by the network administrator whenever OSPF, RIPv2, or EIGRP is being used.
单项选择题 An OSPF interface has been configured with the bandwidth 64 command. What will be the calculated OSPF cost of this link?（）
多项选择题 Which of the following host addresses are members of networks that can be routed across the public Internet?（）
单项选择题 Which of the following is true concerning Frame Relay multipoint subinterfaces?（）