![]() ICMP Test: ICMP Test is used to test whether the destination is reachable or not. ![]() An ICMP protocol mainly uses two terms:.If a router is unable to route the data because of some unusual conditions such as disabled links, a device is on fire or network congestion, then the ICMP protocol is used to inform the sender that the datagram is undeliverable. A datagram travels from router-to-router until it reaches its destination.It is a mechanism used by the hosts or routers to send notifications regarding datagram problems back to the sender.ICMP stands for Internet Control Message Protocol.The recipient adds the physical address both to its cache memory and to the datagram header ARP reply: Every device attached to the network will accept the ARP request and process the request, but only recipient recognize the IP address and sends back its physical address in the form of ARP reply.ARP request: When a sender wants to know the physical address of the device, it broadcasts the ARP request to the network.The two terms are mainly associated with the ARP Protocol:.ARP is a network layer protocol which is used to find the physical address from the IP address. ![]()
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