单项选择题

A user is connected on a DSL line and is using a PPP over Ethernet service.Which network device strips the ATM header from the datagram and investigates the PPP header?（）

A.DSLAM
B.DSL modem
C.ERX Edge Router
D.customer workstation

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单项选择题

In a DSL network，which device terminates the PPP over Ethernet subscriber’s two-wire phone line？（）

A.RAS
B.DSLAM
C.ATMswitch
D.RADIUSserver

单项选择题

Which process occurs first during the Ethernet Discovery Stage process for a PPPoE service offering?（）

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?（）

A.PPPoE Active Discovery Offer
B.PPPoE Active Discovery Initiation
C.PPPoE Active Session Confirmation
D.PPPoE Active Session Acknowledgment