Maximum Transmission Unit

• Each subnet has a maximum frame sizeEthernet: 1518 bytesFDDI: 4500 bytesToken Ring: 2 to 4 kB

• Transmission Unit = IP datagram (data + header)

• Each subnet has a maximum IP datagram length (header + payload) = MTU

S

R

Net 1MTU=1500

Net 2MTU=1000

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