單項選擇題Which IPsec security protocol should be used when confidentiality is required?（）

A.PSK
B.AH
C.MD5
D.ESP


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2.多項選擇題the network administrator has been asked to give reasons for moving from ipv4 to ipv6. what are two valid reasons for adopting ipv6 over ipv4?（）

A.telnet access does not require a password
B.nat
C.no broadcast
D.chanage of destination address in the ipv6 header
E.chanage of source address in the ipv6 header
F.autoconfiguration

3.單項選擇題What is the purpose of the inverse ARP？（）

A.to map a known DLCI to an IP address
B.to map a known IP address to a MAC address
C.to map known SPID to a MAC address
D.to map a known DLCI to a MAC address
E.to map a known IP address to a SPID
F.to map a known MAC address to an IP address

4.單項選擇題switchport trunk native vlan 999 這個命令起什么作用？（）

A.它指定VLAN999轉發(fā)未做標記的流量。
B.它阻止VLAN999轉發(fā)主干的流量。
C.它創(chuàng)建了一個VLAN999接口。
D.它指定VLAN999作為默認為所有未知標記的流量。

5.單項選擇題which command allows you to verify the encapsulation type (CISCO OR IETF) for a frame relay link?（）

A.show frame-relay map
B.show frame-relay lmi
C.show inter serial
D.show frame-relay pvc

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