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Animation 15_1 |
A host uses ARP to determine the hardware address of the destination
of an IP datagram. The sender broadcasts an ARP request, the
destination responds with an ARP reply and the sender sends the IP
datagram directly to the destination.
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Figure 19.1 |
A simple internet with routers R1 and R2 connecting
three physical networks; each network has two host computers attached.
A computer can only resolve the address of a computer attached to
the same physical network.
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Figure 19.2 |
An example address binding table. Each entry in the table contains a
protocol address and the equivalent hardware address.
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Figure 19.3 |
An example of direct lookup for a class C network. The host
portion of an address is used as an array index.
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Figure 19.4 |
Comparison of address resolution using a table lookup (T),
closed-form computation (C), and dynamic message exchange (D).
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Figure 19.5 |
An ARP message exchange. (a) Computer W begins to broadcast an
ARP request that contains computer Y's IP address. (b) All computers
receive the request, and (c) computer Y sends a response directly to
W.
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