单项选择题
A.The ERX router sends an Active Discovery Off ermessage.
B.The ERX router sendsan Active Discovery Initiation message.
C.The customer device sends an Active Discovery Offer message.
D.The customer device sends an Active Discovery Initiation message.
单项选择题 The ERX Edge Router responds to a received PPP over Ethernet Active Discovery Initiation(PADI) with which message type?（）
单项选择题 Which configuration command allows the router to utilize a RADIUS server to auth enticate in coming Telnet users？（）
单项选择题 In a PPP over ATM service offering,which command inserts the user's host route into the routing table?（）