Intro To Computer Networks Week 6

     This week we learned about the Network Layer control plane, such as routing protocols, the software defined networking control plane, and the internet control message protocol (ICMP). Throughout the lectures I found ICMP most interesting as I've seen it most often. ICMP is used in the network layer, where communication between different hosts and routers can be tested. ICMP can be used to query a network by issuing a ping command. In the instance where a ping command fails , that information is also valuable as it allows error to be reported due to a host, network, port, or protocol being unreachable. ICMP sends a request to another host or router, and if reachable, the host or router sends back a reply. However, if the host or router is unreachable, the datagram sent by the querying host is thrown out, and an ICMP error message is delivered to the querying host.

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