Which three statements&#81...

多项选择题Which three statements about RSTP are true？（）

A.RSTP significantly reduces topology reconverging time after a link failure.
B.RSTP expends the STP port roles by adding the alternate and backup roles.
C.RSTP port states are blocking，discarding，learing，or forwarding.
D.RSTP also uses the STP proprsal-agreement sequence.
E.RSTP use the same timer-baseed process as STP on point-to-point links.
F.RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

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1.单项选择题哪个交换机会在STP选择中成为根桥？（）

A. 32768： 11-22-33-44-55-66
B. 32768： 22-33-44-55-66-77
C. 32769： 11-22-33-44-55-65
D. 32769： 22-33-44-55-66-78

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2.单项选择题Which IPsec security protocol should be used when confidentiality is required?（）

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

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3.多项选择题哪两个协议所使用的网桥和/或交换机，以防止在第2层网络环路？（）

A. 802.1d
B. VTP
C. 802.1q
D. STP
E. SAP

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4.多项选择题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

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5.单项选择题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

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6.单项选择题switchport trunk native vlan 999 这个命令起什么作用？（）

A.它指定VLAN999转发未做标记的流量。
B.它阻止VLAN999转发主干的流量。
C.它创建了一个VLAN999接口。
D.它指定VLAN999作为默认为所有未知标记的流量。

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7.单项选择题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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8.单项选择题 根据下图，Switch-1需要往一台MAC地址为00b0.d056.efa4的主机发数据，Switch-1会如何处理这些数据？（）

A.（Switch-1会丢弃该数据，因为它没有该MAC地址条目）
B.（Switch-1会泛洪该数据到所有的接口，除了该数据的源接口）
C.（Switch-1会发送ARP请求到所有的接口，除了该数据的源接口）
D.（Switch-1会往默认网关发送该数据）

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9.单项选择题What is the alternative notation for the IPV6 address B514:82C3:0000:0000:0029:EC7A:0000:EC72?（）

A.B514：82C3：0029：：EC7A：0000：EC72
B.B514：82C3：0029：EC7A：EC72
C.B514：82C3：：0029：EC7A：0：EC72
D.B514：82C3：：0029：EC7A：EC72

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10.单项选择题DNS servers provide what service?（）

A.They run a spell check on host names to ensure accurate routing
B.They convert domain names into IP address
C.Given an IP address,they determine the name of the host that is sought
D.They map individual hosts to their specific IP addresses

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