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Fragmentation offset field

Upper layer field

Version field

Datagram length field.

Type$-$ofservice field

Payload$/$data field

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This fi$$d contains the Internet checksum of this datagram's header fields.

The value in this field is decremented at each router; when it reaches zero, the packet must be dropped.

This field is used for datagram fragmentation$/$reassembly$.$

This field contains the "protocol number" for the transport$-$layer protocol to which this datagram's payload will be This field contains ECN and differentiated service bits.

This field indicates the total number of bytes in datagram.

This field a UDP or TCP segment, for example.

This field contains the IP protocol version number.

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