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

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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
B. show access-list
C. list ip interface
D. show interface
E. show ip interface
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