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多項(xiàng)選擇題

Switch ports operating in which two roles will forward traffic according to the IEEE 802.1w standard?（）

A.alternate
B.backup
C.designated
D.disabled
E.root

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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

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

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