Which layer of the network protocol suite does ICMP belong to?

ICMP, or Internet Control Message Protocol, operates at the Network Layer of the network protocol suite. This layer is primarily responsible for the routing of packets across different networks and for managing the delivery of those packets. ICMP is specifically utilized for error handling and diagnostic functions within an IP network. It allows network devices, like routers, to send error messages indicating issues such as unreachable destinations or time exceeded in transit.

The Network Layer’s role is crucial because it provides the means for addressing and routing packets to ensure they reach their intended destinations, a function that directly correlates with the responsibilities of ICMP. By being part of this layer, ICMP supports essential network management tasks that are fundamental to maintaining a robust and efficient network.