Which logical unit number must be configured on an interface using PPP encapsulation?（）

单项选择题Which CLI command allows you to determine how many licenses are currently used on the routerand are further needed by the router?（）

A. show system license key
B. show system license usage
C. show system license total
D. show system license profile

多项选择题What are two ways to create a rescue configuration on a J-series router?（）

A. Use the J-Web System > Rescue menu.
B. Use the J-Web Configuration > Rescue menu.
C. Issue the configure rescue save command.
D. Issue the request system configuration rescue save command.