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?（）AThe PC has connectivity with a local host.BThe PC has connectivity with a Layer 3 device.CThe PC has a default gateway correctly configuredDThe PC has connectivity up to Layer 5 of the OSI modelEThe PC has the TCP/IP protocol stack correctly installed.
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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