IS - IS is often considered an a

IS - IS is often considered an alternative to OSPF in the IP world. Which two statements identify similarities between IS -IS and OSPF?（）

A、support for designated intermediate systems and backup designated intermediate systems
B、support for multip le areas per router
C、support for classless routing
D、support for address summarization between areas
E、support for both DIS adjacencies and neighbor adjacencies

正确答案:C,D

答案解析:有

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