问题 Which command can verify Application Layer connectivity between 2 hosts? A. arp B. ping C. telnet D traceroute E. 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