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多项选择题Which two conditions, when met, allow an IS-IS Level 2 router to be considered attached?()

A、You can reach other Level 2 routers.

B、It can reach at least one other defined area.

C、The router is reachable by at least two ES-IS nodes.

D、It has at least one enabled reachable prefix with a valid metric defined.

  • B,D
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