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TCP/IP Guide by Charles M. Kozierok

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Chapter 13. ADDRESS RESOLUTION AND THE TCP/IP ADDRESS RESOLUTION PROTOCOL (ARP)

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Communication on an internetwork is accomplished by sending data at layer 3 using a network layer address, but the actual transmission of that data occurs at layer 2 using a data link layer address. This means that every device with a fully specified networking protocol stack will have both a layer 2 and a layer 3 address. It is necessary to define some way of being able to link these addresses together. Usually, this is done by taking a network layer address and determining what data link layer address goes with it. This process is called address resolution.

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