Which IPv4 address can a host use to ping the loopback interface?
127.0.0.1
A host can use the IPv4 address 127.0.0.1 to ping the loopback interface.
This address is reserved for the loopback interface and is commonly referred to as the loopback address.
When a host sends packets to this address, they are routed back to the same host without being sent over the network.
Pinging the loopback address allows a host to test if the network stack on the local machine is functioning correctly.
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