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单项选择题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

  • D

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