A certain router runs IS-IS, and its output information is shown in the figure. Which of the following statements is correct?
A . The cycle of sending llH on the s4/0/0 interface is 30s
B. The circuit-level1 of the s4/0/0 interface is Level-1
C. The Cost value of the s4/0/0 interface is 20
D. The s4/0/0 interface supports IPv6
Answer: B
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