Which IPsec security protocol should b...

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

A.AH
B.MB5
C.PSK
D.ESP

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1.单项选择题Wich command can you use to manually assign a static IPV6 address to a router interface?（）

A.ipv6 address PREFIX_1::1/64
B.ipv6 autoconfig 2001:db8:2222:7272::72/64
C.ipv6 autoconfig
D.ipv6 address 2001:db8:2222:7272::72/64

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2.单项选择题 In order to allow the establishment of a Telnet session with a router, which set of commands must be configured（）。

A.A
B.B
C.C
D.D
E.E
F.F

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3.单项选择题If an Ethernet port on a router was assigned an IP address of 172.1.1.1/20，what is the maximum number of host sallowed on this subnet？（）

A.4094
B.1024
C.8190
D.2046
E.4096

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4.单项选择题Why will a switch never learn a broadcast address？（）

A.Broadcast frames are never sent to swiches.
B.Broadcast addresses use an incorrect format for the switching table.
C.A broadcast address will never be the source address of a frame.
D.Broadcasts only use network layer addressing.
E.A broadcast frame is never forwarded by aswitch.

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5.单项选择题As witch is configured as a vtp sever with a domain name of CCNA.Which cisco ios privileged mode command，followed by a reload of the swith，will reset the VTP management domain name of the switch to a NULL value？（）

A.#vtp domain unset
B.#delete vlan.dat
C.#no vtp domain
D.#vtp domain null

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6.单项选择题根据以下的配置，请判断当主接口serial0出故障后，哪一个备份接口最先被启用？（）[Quidway-Serial0]standby interface serial 1 30[Quidway-Serial0]standby interface serial 2 40[Quidway-Serial0]standby logic-channel 3 50[Quidway-Serial0]standby logic-channel 2 35

A.serial 1
B.serial 2
C.logic-channel 2
D.logic-channel 3

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7.单项选择题访问控制列表配置中，操作符“greater-than portnumber”表示控制的是（）。

A.端口号小于此数字的服务
B.端口号大于此数字的服务
C.端口号等于此数字的服务
D.端口号不等于此数字的服务

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8.单项选择题dialertimeridle这条命令的意思是设置（）。

A.链路空闲时间
B.忙端口的空闲时间
C.链路断开时间
D.端口数据可以发送等待时间

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9.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 atates are blocking，discarding，learing，orforwarding.
D.RSTP also uses the STP proprsal-agreement sequence.
E.RSTP use the same timer-baseed processas STP on point-to-pointlinks.
F.RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

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10.多项选择题配置DCC的目的是为了实现按需拨号，即只在有数据要发送的时候才开始拨号建立连接，所以要配置一个开始拨号的触发条件的命令是（）。

A.acl
B.dialer enable-circular
C.dialer-group
D.dialer-rule

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