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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MSR 路由器上，ping 命令的-t 参数指定ICMP Echo Reply 报文的超时时间，取值范围为1～65535，单位为毫秒，它的默认值为（）毫秒。A、200B、100C、2000D、1000
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PPP Echo-Request、Echo-Reply除了握手之外，还具备检测环路的功能，那么它会携带什么配置参数选项？（）A、Maximum-Receive-UnitB、Magic-NumberC、Authentication-ProtocolD、Reserved
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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
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Which statement is true when ICMP echo and echo-reply are disabled on edge devices？（）A、Pings are allowed only to specific devices.B、CDP information is not exchanged.C、Port scans can no longer be run.D、Some network diagnostic data is lost.E、Wireless devices need to be physically connected to the edge device.F、OSPF routing needs the command ip ospf network non-broadcast enabled.
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单选题____ will be appreciated.A
You reply our letter earlyB
You reply to our letter earlyC
Your early reply our letterD
Your early reply to our letter
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多选题Which two statements regarding traceroute on JUNOS devices are correct?（）ATraceroute transmits ICMP echo-request packets.BTraceroute transmits UDP packets.CTraceroute receives ICMP echo-reply packets.DTraceroute receives ICMP port-unreachable packets.
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