Answer:
One example of a protocol that works at the Internet layer of TCP/IP other than IP itself is the Internet Control Message Protocol (ICMP).
Step-by-step explanation:
ICMP is used by network devices, such as routers and firewalls, to communicate error messages and status information about network conditions.
ICMP is designed to work alongside IP and is used to provide feedback about network conditions, such as whether a particular host is reachable or if a packet has been dropped due to congestion or other issues. ICMP messages are sent in response to network events and are typically not used for user-initiated communication.
Other protocols that work at the Internet layer of TCP/IP include Internet Group Management Protocol (IGMP) for managing multicast traffic and Internet Protocol Security (IPsec) for providing secure communication over IP networks.