If you use the ping command to send an echo request from one host to the other, then which of the following protocols have you used?

If you use the ping command to send an echo request from one host to the other, the protocol that is used is ICM protocol.

Explanation:

When the router encounters a hindrance in the delivery of an internet packet, it registers an error. This error message is sent using the internet control message protocol commonly known as ICMP. Other than error messages, this protocol is also used in automated exchange of operational information.