试题详情
- 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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