You are currently troubleshooting a network issue with your ISP's customer support agent. The agent requests that you open a command prompt and type ping $127\mathrm{.}0\mathrm{.}0\mathrm{.}1.$ What does this accomplish?

$$ tests the default gateway

tests a well$-$known public IP address

tests that the local IP protocol is functioning

$$ tests TCP$/$IP configuration settings