单项选择题

Which encapsulation type is a Frame Relay encapsulation type that is supported by Cisco routers?（）

A.IETF
B.HDLC
C.Q9333-A Annex A
D.ANSI Annex D

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单项选择题
Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?（）

A.Frame Relay
B.HDLC
C.x.25
D.PPP
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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