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多项选择题Which two statements about the IS -IS routing protocol are true?()

A、IS - IS is capable of supporting IPv4 and IPv6.

B、IS - IS is only capable of supporting IPv4 and CLNS.

C、IS - IS routers use ES - IS hellos (ESH) to establish and to maintain neighbor relationships.

D、IS - IS routers run the Bellman - Ford algorithm against their LSDBs to pick the best paths.

E、Level 1 routers learn about paths within the area of which they are a part.

F、Level 2 routers learn about paths both within areas and between areas.

  • A,E
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