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An administrator issues the command ping 127.0.0.1 from the

题目
单选题
An administrator issues the command ping 127.0.0.1 from the command line prompt on a PC. If a reply is received, what does this confirm（）。
A

The PC has connectivity with a local host.

B

The PC has connectivity with a Layer 3 device.

C

The PC has a default gateway correctly configured.

D

The PC has connectivity up to Layer 5 of the OSI model.

E

The PC has the TCP/IP protocol stack correctly installed.

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相似问题和答案

第1题：

The Ezonexam network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test? (Choose two)

A．ARP

B．CDP

C．DHCP

D．DNS

E．ICMP


正确答案：AE
解析：Explanation:ARPfindsthehardwareaddressofahostfromaknownIPaddress.Here'showitworks:whenIPhasadatagramtosend,itmustinform.aNetworkAccessprotocol,suchasEthernetorTokenRing,ofthedestination'shardwareaddressonthelocalnetwork.(Ithasalreadybeeninformedbyupper-layerprotocolsofthedestination'sIPaddress.)IfIPdoesn'tfindthedestinationhost'shardwareaddressintheARPcache,itusesARPtofindthisinformation.ICMPworksattheNetworklayerandisusedbyIPformanydifferentservices.ICMPisamanagementprotocolandmessagingserviceproviderforIP.ItsmessagesarecarriedasIPdatagrams.RFC1256isanannextoICMP,whichaffordshosts'extendedcapabilityindiscoveringroutestogateways.Periodically,routeradvertisementsareannouncedoverthenetwork,reportingIPaddressesfortherouter'snetworkinterfaces.Hostslistenforthesenetworkinfomercialstoacquirerouteinformation.Aroutersolicitationisarequestforimmediateadvertisementsandmaybesentbyahostwhenitstartsup.

第2题：

The network administrator has asked you to check the status of the workstation’s IP stack by pinging the loopback address.Which address would you ping to perform this task?()

A.10.1.1.1

B.127.0.0.1

C.192.168.0.1

D.239.1.1.1


参考答案：B

第3题：

Regarding the extended ping command; which of the statements below are true?

(Select all valid answer choices)

A．The extended ping command is supported from user EXEC mode.

B．The extended ping command is available from privileged EXEC mode.

C．With the extended ping command you can specify the TCP and UDP port to be pinged.

D．With the extended ping command you can specify the timeout value.

E．With the extended ping command you can specify the datagram size.


正确答案：BDE
解析：Explanation:
The extended ping command works only at the privileged EXEC command line.
Some of the extended ping command values include the datagram size and timeout value as shown:

Datagram size [100]: Size of the ping packet (in bytes). Default: 100 bytes.

Timeout in seconds [2]: Timeout interval. Default: 2 (seconds). The ping is declared successful only if the ECHO REPLY packet is received before this time interval.

Incorrect Answers:
A. Regular pings are available in both user and privileged mode, but not extended pings.
C. Ports can not be specified.

第4题：

You are unable to telnet to a router at address 203.125.12.1 from a workstation with the IP address 203.125.12.23. You suspect that there is a problem with your protocol stack. Which of the following actions is most likely to confirm your diagnosis?（）

  • A、ping 127.0.0.0
  • B、ping 203.125.12.1
  • C、telnet 127.0.0.1
  • D、ping 127.0.0.1
  • E、tracert 203.125.12.1

正确答案:D

第5题：

ping是一个非常常用的网络测试程序,下列命令格式错误的是()。

A.ping 127.0.0.1–n

B.ping www.163.com–n17

C.ping 127.0.0.1–t

D.ping www.163.com–l64


参考答案：A

第6题：

我们在排除网络故障时,经常使用“ping 127.0.0.1”、“ping<本机IP地址>”、“ping<默认网关IP地址>”和“

我们在排除网络故障时，经常使用“ping 127.0.0.1”、“ping＜本机IP地址＞”、“ping＜默认网关IP地址＞”和“ping＜远程主机IP地址或域名＞”。这些命令分别有什么样的功能?


正确答案：ping 127.0.0.1”用于验证本地计算机上是否安装TCP/IP协议以及配置是否正确；“ping本机IP地址＞”用于验证本地计算机是否正确地添加到网络；“ping默认网关IP地址designtimesp=9867＞”用于验证默认网关是否运行以及能否与本地主机通信；“ping远程主机IP地址或域名 designtimesp=9868＞”用来验证到远程主机能否正常通信。
ping 127.0.0.1”用于验证本地计算机上是否安装TCP/IP协议以及配置是否正确；“ping本机IP地址＞”用于验证本地计算机是否正确地添加到网络；“ping默认网关IP地址designtimesp=9867＞”用于验证默认网关是否运行以及能否与本地主机通信；“ping远程主机IP地址或域名 designtimesp=9868＞”用来验证到远程主机能否正常通信。 解析：当发现一台主机与另一台主机无法正常通信时，第一步是用ping环回地址(127.X.X.X)来验证在本地计算机上是否安装TCP/IP协议以及配置是否正确，如果能ping通说明TCP/IP协议已经安装；第二步是ping本地计算机的IP地址，用来验证是否正确地添加到网络，如果不能ping通则有可能与其他计算机IP地址冲突或网卡安装不正确；第三步是Ping默认网关的IP地址，用来验证默认网关是否运行以及能否与本地主机通信；最后瑞Ping远程主机的IP地址或域名，用来验证到远程主机能否正常通信，如果能通信，则问题可能出现在网络系统的软件配置方面。
这里需要注意，在A类地址中，127.0.0.0网络中的所有地址(127.0.0.1～127.255.255.254)都是环回地址，用户可通过ping 127.X.X.X测试环回地址的连通性来判断本机是否安装了TCP/IP协议。

第7题：

A network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test?()

A.ARP

B.CDP

C.DHCP

D.DNS

E.ICMP


参考答案：A, E

第8题：

You are unable to telnet to a router at address 203.125.12.1 from a workstation with the IP address 203.125.12.23. You suspect that there is a problem with the IP protocol stack in your PC. Which of the following actions is most likely to confirm your diagnosis?

A. ping 127.0.0.0

B. ping 203.125.12.1

C. telnet 127.0.0.1

D. ping 127.0.0.1

E. tracert 203.125.12.1

F. None of the above


正确答案：D
D 解析：Explanation:
Every Windows based PC uses the 127.0.0.1 as the local loopback IP address. Every PC will respond to this local IP address if the TCP/IP stack is correctly installed and running on the machine. If you cannot ping the loopback address of 127.0.0.1, then something is wrong with the TCP/IP protocol stack

第9题：

A technician is troubleshooting a network connectivity issue on a MFD and would like to eliminate the possibility of another device on the network having the same IP address. The technician should：（）

  • A、disconnect the MFD and ping the IP address.
  • B、disconnect the MFD and ping the subnet mask.
  • C、disconnect the MFD and ping the loopback address.
  • D、run the ipconfig command from the command prompt.

正确答案:A

第10题：

The network administrator has asked you to check the status of the workstation’s IP stack by pinging the loopback address.Which address would you ping to perform this task？（）

  • A、10.1.1.1
  • B、127.0.0.1
  • C、192.168.0.1
  • D、239.1.1.1

正确答案:B

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