單項(xiàng)選擇題

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

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多項(xiàng)選擇題

Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN? （）

A.HDLC
B.Ethernet
C.Token Ring
D.PPP
E.FDDI
F.Frame Relay

單項(xiàng)選擇題

Refer to the exhibit.How many broadcast domains exist in the exhibited topology？（）

A.one
B.two
C.three
D.four
E.five
F.six