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TE（echo time）
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When you use the ping command to send ICMP messages across a network, what's the most common request/reply pair you'll see? (Select one answer choice)A．Echo request and Echo replyB．ICMP hold and ICMP sendC．ICMP request and ICMP replyD．Echo off and Echo onE．None of the above
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在UNIX系统中，Shell程序(21)实现显示用户主目录以及当前命令的进程标识符。A．echo UserHome directory:$LOGNAME echo Current shell's PID:$$B．echo UserHome directory:$HOME echo Current shell'PID:$@C．echO UserHOme directOIy:$LOGNAME echo Current shell'sPID:$@D．echo UserHome directory:$HOME echo Current shell'sPID:$$
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在Unix系统中，Shell程序(57)实现显示用户主目录以及当前命令的进程标识符。A．echo UserHome directory:$LOGNAME echo Current shell's PID:$$B．echo UserHome directory:$HOME echo Current shell's PID:$@C．echo UserHome directory:$LOGNAME echo Current shell's PID：$@D．echo UserHome directory:$HOME echo Current shell's PlD:$$
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WhichconfigurationwouldmakeanIPSLAprobeuseaprecedencevalueof3?()
A.ipsla1icmp-echo1.1.1.1 tos12B.ipsla1icmp-echo1.1.1.1 tos96C.ipsla1icmp-echo1.1.1.1 precedence3D.ipsla1icmp-echo1.1.1.1 dscp12
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在UNIX系统中，Shell程序(19)实现显示用户主目录以及当前命令的进程标识符。A．cho UserHome directory：$LOGNAME echo Carrent shell's PID：$$B．echo UserHome directory：$HOME echo Carrent shell's PID：$＠C．echo UserHome directory：$ LOGNAME echo Carrent shell's PID：S＠D．echo UserHome directory：$HOME echo Carrent shell's PID：$$
考题
linux系统中，以下显示结果相同的是（）。A、echo The current working path is $PWD.B、echo "The current working path is $PWD." Echo helloC、echo 'The current working path is $PWD.' Echo helloD、echo "The current working path is `pwd`."E、echo The current working path is $PWD. Echo hello
考题
Which statement best describes echo?（）A、Echo is the discernable leak-through of your own Rx path into your own Tx path. B、Echo is the discernable leak-through of the packets of your Rx path into your own Tx path. C、Echo is the nonaudible leak-through of the packets of your Rx path into your own Tx path. D、Echo is the audible leak-through of the packets from the transmit path into your own receive path. E、Echo is the nonaudible leak-through of the packets of your Tx path into your own Rx path.
考题
Which of the following technologies can improve convergence time following a link failure in a serviceprovider network？（）A、MPLS TE FRB、MPLS VPNC、BFDD、RSVPE、VPLSF、SNMP
考题
linux系统中，以下显示结果不同的是（）。A、echo The current working path is $PWD.B、echo 'The current working path is $PWD.'C、echo "The current working path is $PWD."D、echo "The current working path is `pwd`."
考题
在Premiere Pro中，对片断施加Echo特效，那么：（）A、Echo特效前面所有的特效均做无效处理B、Echo特效后面的特效均做无效处理C、Echo特效不会影响片断上施加的其他特效D、除Echo特效以外的特效都无效
考题
从源设备到目的设备之间有两跳，使用tracert命令检测路径。检测第一跳时，源设备对目的设备的某个较大的端口发送一个TTL为1的UDP报文，当该报文到达中间一跳时，TTL将变为0，于是该设备对源设备回应一个ICMP（）消息。A、Time ExceededB、Echo RequestC、Echo ReplyD、Port Unreachable
考题
PING命令使用了哪种ICMP消息？（）A、RedirectB、Source quenchC、Echo request和Echo replyD、Destination unreachable
考题
常用来进行网络连通性检查的Ping命令工具，它的工作原理为（）。A、向目标主机发送UDP Echo Request数据包，等待对方回应UDP Echo Reply数据包B、向目标主机发送ICMP Echo Request数据包，等待对方回应ICMP Echo Reply数据包C、向目标主机发送UDP Echo Reply数据包，等待对方回应ICMP Echo Request数据包D、向目标主机发送ICMP Echo Reply数据包，等待对方回应ICMP Echo Request数据包
考题
下面对于echo，print的描述正确的是（）。A、echo，print都可以打印多个参数B、print可以打印多个参数，echo不可以C、echo可以打印多个参数，print不可以D、echo，print都不可以打印多个参数
考题
Adobepremiereprocs3中，声音特效主要有（）A、Echo、Delay、MixtureB、Fade、Delay、MixtureC、Echo、Fade、DelayD、Echo、Delay
考题
防止系统对ping请求做出回应，正确的命令是：（）。A、echo0/proc/sys/net/ipv4/icmp_ehco_ignore_allB、echo0/proc/sys/net/ipv4/tcp_syncookiesC、echo1/proc/sys/net/ipv4/icmp_echo_ignore_allD、echo1/proc/sys/net/ipv4/tcp_syncookies
考题
What is the correct command to display the current working directory?（）A、echo $PWDB、echo $pwdC、echo $CWDD、echo $cwd
考题
单选题Which of the following technologies can improve convergence time following a link failure in a serviceprovider network？（）A
MPLS TE FRB
MPLS VPNC
BFDD
RSVPE
VPLSF
SNMP
考题
单选题（）provides a paper trace of course steered by the vessel against time.A
The echo sounderB
The radarC
The course recorderD
The direction finder
考题
单选题Which of the following is the best version of sentence 7 (reproduced below)?The vibrant costumes, including black leather jackets, reflected the 1950% the time period Lurhmann uses.A
The vibrant costumes and black leather jackets, reflected the 1950’s, the time period Lurhmann uses.B
The black leather jackets and other vibrant costumes echo the 1950’s, the time period Lurhmann used in his production.C
Lurhmann uses black leather jackets and other vibrant costumes of the 1950’s in his production to suggest the time period of the production.D
The vibrant costumes, and jackets imitated those of the 1950’s, the time period Lurhmann uses in his production.E
The black leather jackets and other vibrant costumes reproduced the time period of the 1950’s of which Lurhmmnn uses in his production.
考题
单选题What happens when you issue the ping 172.19.102.2 count 5 command?（）A
ICMP echo requests are sent to 172.19.102.2 in five-millisecond intervals.B
ICMP echo requests are sent to 172.19.102.2 until five packets are dropped.C
ICMP echo requests are sent to 172.19.102.2 five times.D
ICMP echo requests are sent continuously to 172.19.102.2 for five seconds.
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