The PING command uses the services of the Internet Control Message Protocol (ICMP), the latter being encapsulated in the IP header. Therefore, the ping utility operates basically on layer 3 (the Network layer) of the OSI model. It does not use the services of the Transport layer, and the reason for that is that traffic reliability issues are not the case here. Ping performs a simple host lookup. TRACEROUTE is another very helpful utility that operates similarly to ping and also uses the services of the ICMP protocol. Traceroute, as the name implies, is used to trace the path between the sender and the destination host. It is a one-way trace, meaning that it traces the route from the source to destination and not the other way around, which by the way, may follow a different path. Traceroute also uses the services of User Datagram Protocol (UDP), in specific implementations, as the transport layer for a specific reason that we'll go into further on. In order to understand...
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