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单项选择题An IS-IS router is adjacent to and passing traffic with a neighbor. You perform a show is interface detail command and notice that for some interfaces you have a circuit type of 3. Which IS-IS level(s) is enabled on these interfaces?()

A、Level 1 only

B、Level 2 only

C、Level 1 and Level 2

D、Level 3 only

  • C
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