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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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