单项选择题
A. The data link layer
B. The application layer
C. The access layer
D. The session layer
E. The network layer
单项选择题 You are logged into a router and with to view the layer 3 information about your neighboring Cisco routers. What IOS command gives layer 3 information for of the directly connected router interfaces?（）
单项选择题 In the context of configuring dial-on-demand routing using ISDN, what is the purpose of the dialer-list command?（）
单项选择题 A network administrator needs to configure a router for a Frame Relay connection to a non-Cisco router. Which of the following commands will prepare the WAN interface for this connection?（）