单项选择题

Which command displays the CHAP authentication process as it occurs between two routers?（）

A. debug authentication
B. debug chap ppp
C. debug chap authentication
D. debug ppp authentication

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单项选择题
At which layer of the OSI model dose PPP perform?（）

A. Layer 3
B. Layer 4
C. Layer 2
D. Layer 5
单项选择题
Which command is used to display the collection of OSPF link states?（）

A. show ip ospf lsa database
B. show ip ospf link-state
C. show ip ospf neighbors
D. show ip ospf database
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