Summary

By now, you can see the many aspects of ICMP, which is a significant protocol in the TCP/IP suite. We looked at the purpose of ICMP, a method to communicate issues that prevent data delivery. We compared ICMP and ICMPv6, which have similar functions, but we now understand that ICMPv6 has a bigger role. So that you can use this protocol while troubleshooting, we discovered ICMP messages that communicate with hosts to report on transmission errors. In addition, we saw how query messages can be used to attempt to obtain information from a host.

To better understand the ICMP type and code values, we examined how they work when communicating information. In addition, we learned that there are some ICMP types that you will rarely see as they are now deprecated and/or not supported. By now, you should recognize that ICMP is a powerful protocol that helps to move traffic on a network, but can also be used in malicious ways. As a result, you should configure firewall rules that...