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单选题
Which protocol is an open standard protocol frame work that is commonly used in VPNs，to provid secureend-to-end communication？（）
A
L2TP
B
IPsec
C
PPTP
D
RSA
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单选题What does the protocol field inside the PPP frame indicate？（）A
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the protocol used to carry the PPP frameD
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单选题Which Ethernet field is used to differentiate between the FCoE frame and the FIP frame？（）A
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多选题Which three statements are true about TACACS+？（）AIt is a Cisco proprietary protocol.BIt runs on TCP port 59. .CAuthentication and authorization are done at different stages.DTACACS+ encrypts the entire body of the packet， but leaves a standard TACACS+ header.EIt is an industry standard protocol.FTACACS+ encrypts both the entire body of the packet and the TACACS+ header.
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单选题Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch overFastEthernet？（）A
802.3adB
802.1wC
802.1QD
802.1d
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多选题Which two of these are characteristics of the 802.1Q protocol?（）Ait is a layer 2 messaging protocol which maintains vlan configurations across network.Bit includes an 8-bit field which specifies the priority of a frame.Cit is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.Dit modifies the 802.3 frame header,and thus requires that the FCS be recomputed.Eit is a trunking protocol capable of carring untagged frames.
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单选题If you needed to transport traffic coming from multiple VLANs （connected between switches）， and your CTO was insistent on using an open standard，which protocol would you use？（）A
802.11BB
spanning-treeC
802.1QD
ISLE
VTPF
Q.921
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