What can be verified by successfully pinging the reserved loopback address on a host?

Connectivity exists between two hosts on the LAN.

The TCP/IP stack of the local host is installed correctly.

A connection exists between a host and the default gateway.

The route a packet takes from the local host to a remote host is valid.

The TCP/IP stack of the local host is installed correctly

Test huh?

Think about what the loopback address is. Theres your answer.

The TCP/IP stack of the local host is installed correctly.