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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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 -
单项选择题
When you are troubleshooting an ACL issue on a router,which command can help you to verify which interfaces are affected by the ACL?（）
A. show ip access-list
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E. show ip interface
