单项选择题

By default, which PPP mechanism does the ERX Edge Router use to monitor the session for a PPP over ATM client?（）

A. ping
B. hello
C. get request
D. echo request

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单项选择题

A. show users
B. show subscriber
C. show ppp interface
D. show ppp interface status ip

单项选择题

A. show users
B. show subscriber
C. show aaa subscriber
D. show connected subscriber

单项选择题

End users are failing to log in to the network.
Which command is used on the ERX Edge Router to validate communications with the RADIUS server?（）

A. test ppp aaa
B. test aaa ppp
C. test radius user
D. test user radius