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多项选择题Which two statements are true by default of a multilevel IS-IS network?()

A、Level 1 only routers see routes contained in their area.

B、Level 1 routers route towards Level 2 routers due to the attached bit.

C、Level 2 routers route towards Level 1 routers due to the attached bit.

D、Level 2 routers can see routes in other Level 2 areas and routes originated in Level 1 areas.

  • A,D
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