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Understanding TCP/IP by Libor Dostálek, Alena Kabelová

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5.5 ARP and RARP Protocols

If I am a station on a local network and want to communicate with another station on the same network through an IP datagram, I address a 4-byte IP address to the station in the IP datagram. In performing the transmission, I know the source IP address (my address) and the destination IP address. I can therefore complete an IP datagram. But the problem is that this IP datagram must be wrapped in a link frame, for example, in an Ethernet frame. In order to create an Ethernet frame, I need the link (6 B) addresses of both the source and the destination. I am the source and I know my link address, but I do not know the destination link address. How do I find out what this address is? The answer is by using the Address Resolution ...

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