單項選擇題

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

A.The ERX router sends an Active Discovery Offer message.
B.The ERX router sends an Active Discovery Initiation message.
C.The customer device sends an Active Discovery Offer message.
D.The customer device sends an Active Discovery Initiation message

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單項選擇題

A user is connected on a DSL line and is using a PPP over Ethernet service. Which network device encapsulates the datagram inside of an ATM header?（）

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

多項選擇題

What are the two well-known UDP ports used by RADIUS accounting servers?（）

A.1645
B.1646
C.1812
D.1813