单项选择题

Which configuration command limits the number of connections supported on a single PPPoE major interface?（）

A.sessions
B.sa-validate
C.split-horizon
D.duplicate-protection

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单项选择题

Which configuration command prevents a client from establishing multiple PPPoE connections from a single workstation?（）

A. sessions
B. sa-validate
C. split-horizon
D. duplicate-protection

单项选择题

A metro Ethernet user is connected using a PPP over Ethernet service.How many Layer 2 headers are attached to each IP datagram?（）

A.1
B.2
C.3
D.4

单项选择题

Which set of commands correctly builds a PPP over Ethernet connection on a DSL connection?（）

A. interface atm 5/1.1 atm pvc 1 0 101 aal5snap encapsulation ppp ppp authentication chap ip unnumbered loopback 1
B. interface atm 5/1.1 atm pvc 1 0 101 aal5snap encapsulation pppoe interface pppoe 5/1.1 encapsulation ppp ppp authentication chap ip unnumbered loopback 1
C. interface atm 5/1.1 atm pvc 1 0 101 aal5snap encapsulation pppoe interface atm 5/1.1.1 encap ppp ppp authentication chap ip unnumbered loopback 1
D. interface atm 5/1.1 atm pvc 1 0 101 aal5snap encapsulation pppoe ppp authentication chap ip unnumbered loopback 1