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TCP/IP Guide by Charles M. Kozierok

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Chapter 23. IP ROUTING AND MULTICASTING

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The essential functions of Internet Protocol (IP) datagram encapsulation and addressing are sometimes compared to putting a letter in an envelope and then writing the address of the recipient on it. Once our IP datagram "envelope" is filled and labeled, it is ready to go, but it's still sitting on our desk. The last of the main functions of IP is to get the envelope to our intended recipient. This is the process of datagram delivery. When the recipient is not on our local network, this delivery requires that the datagram be routed from our network to the one where the destination resides.

This chapter concludes ...

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