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单选题
An IS-IS router is adjacent to and passing traffic with a neighbor. You perform a show isis 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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考题
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考题
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考题
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考题
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考题
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考题
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DUSB
line timingC
loop timingD
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