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
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相关考题
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多项选择题
Which two options are valid WAN connectivity methods?（）
A.PPP
B.WAP
C.DSL
D.Ethernet
E.L2TPv3 -
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
