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TCP/IP Guide by Charles M. Kozierok

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Chapter 22. IP DATAGRAM SIZE, FRAGMENTATION, AND REASSEMBLY

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The main responsibility of the Internet Protocol (IP) is to deliver data between internetworked devices. As you saw in the preceding chapter, this requires that data received from higher layers be encapsulated into IP datagrams for transmission. These datagrams are then passed down to the data link layer, where they are sent over physical network links. In order for this to work properly, each datagram must be small enough to fit within the frame format of the underlying technology. If the message is bigger than the maximum frame size of the underlying network, it may be necessary to fragment ...

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