多选题Which two conditions, when met, allow an IS-IS Level 2 router to be considered attached?（）AYou can reach other Level 2 routers.BIt can reach at least one other defined area.CThe router is reachable by at least two ES-IS nodes.DIt has at least one enabled reachable prefix with a valid metric defined.
多选题
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.
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