Routing Question:
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What is ARP?

Answer:

ARP, the ADDRESS RESOLUTION PROTOCOL. ARP is the protocol which converts the IP address to an address appropriate to the hardware type (ie, Ethernet addresses on an ether network). After normal routing protocols have done their work, ARP springs in to action. It's what actually gets packets from one machine to another. Usually, you should not have to worry about ARP at all. Except in special setups, it should work totally transparently.

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