单选题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?()ALevel 1 onlyBLevel 2 onlyCLevel 1 and Level 2DLevel 3 only

单选题
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


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