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多項(xiàng)選擇題

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.

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