找考题网-背景图
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