AARP Operat ion
The Ap^eTalk Address Reso'ution P potocol oAARP) maps hardware addresses to netwo hddrossos. W hen an A pploTalk p rotocol has da ta to send, it pasae s the network ad dress of1 the piestination node to AARP . It is the job of AA RP to supp . m the haodw are address associated with dhat netw ook add ress.
AARP checks the AMT to see whether the network address is already mapped to a hardware address. If the addresses are already mapped, the hardware address is passed to the inquiring AppleTalk protocol, which uses it to communicate with the destination. If the addresses are not mapped, AARP transmits a broadcast requesting that the node using the network address in question supply its hardware address.
When the request reaches the node using the network address, that node replies with its hardware address. If no node exists with the specified network address, no response is sent. After a specified number of retries, AARP assumes that the protocol address is not in use and returns an error to the inquiring AppleTalk protocol. If a response is received, the hardware address is associated to the network address in the AMT. The hardware address then is passed to the inquiring AppleTalk protocol, which uses it to communicate with the destination node.
Continue reading here: Datagram Delivery Protocol Overview
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