多项选择题
Which two options are valid WAN connectivity methods?（）
A.PPP
B.WAP
C.DSL
D.Ethernet
E.L2TPv3
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相关考题
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单项选择题
At which layer of the OSI model dose PPP perform?（）
A.Layer 3
B.Layer 4
C.Layer 2
D.Layer 5 -
单项选择题
Which protocol is an open standard protocol framework that is commonly used in VPNs,to provid secure end-to-end communication?（）
A. L2TP
B. IPsec
C. PPTP
D.RSA -
单项选择题
which command is used to enable CHAP authentication whit PAP as the fallback method on a serial interface?（）
A.(config-if)#authentication ppp chap fallback ppp
B.(config-if)#authentication ppp chap pap
C.(config-if)#ppp authentication chap pap
D.(config-if)#ppp authentication chap fallback ppp
