问题

Which command can verify Application Layer connectivity between 2 hosts?A. arpB. pingC. telnetD tracerouteE. plp

题目意思:以下命令当中那个是在应用层验证两个主机的联通性的命令?

Telnet tests the Application layer, ping test the Network layer.Telnet is an application used to remotely configure a device. If telnet is succesfful you know that full 7 layer stack on the sending and receiving host are configured correctly and are in working order

  因为telnet命令是工作在应用层,ping命令是工作在网络层的,telnet是应用于远程控制设备的,所以如果能telnet成功的话,这就证明了两台主机或设备已经联通了,在联通性上面已经没有问题了。

  该题目主要考学员命令工作的层面,和OSI七层的关系。

正确答案:C