In a network-troubleshooting scenario, a network administrator needs to verify that the server's TCP/IP stack is operational without sending any traffic onto the physical network or involving the NIC hardware. Which IP address should the administrator use to perform this test?
10.0.0.1
169.254.0.1
192.168.1.1
127.0.0.1
The IPv4 loopback address, 127.0.0.1, routes packets back to the host itself. Pinging this address confirms that the local TCP/IP stack is installed and functioning, but it does not traverse the physical network interface card. Using other private, APIPA, or gateway-style addresses (192.168.1.1, 10.0.0.1, 169.254.0.1) would place traffic on the actual network segment, defeating the purpose of an internal stack test.
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