The Internet Protocol: IPV4 Packet Fragmentation & Reassembly

In this lesson, we'll study IP version 4 fragmentation and reassembly.

Why Fragmentation?

Although IPv4 packets can be as big as 64kB, few data link layer technologies can send a 64 KB IPv4 packet inside a frame.

Furthermore, as in the figure below, if the host on the FDDI network abides by its own data link layer’s maximum packet size of 44784478 bytes, the resulting data link layer frame would violate the maximum frame size of the Ethernet between routers R1 and R2. Hence, a host may end up sending a packet that is too large for a data link layer technology used by (an) intermediate router(s).

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