Compare The Layers Of The Osi And Tcp/ip Models

Front 1

Used to identify the port number of the intended application service on the remote machine.

Back 1

Destination Port

Front 2

Indicates that all prior bytes sent have been already received and that the next segment is expected.

Back 2

Acknowledgment Number

Front 3

Engages error checking of header and data

Back 3

Checksum

Front 4

If turned on, this bit flags TCP that all data is received and the session should be terminated.

Back 4

Fin Bit

Front 5

Specifies the number of bytes that can be sent or that the receiver is willing to receive at one time.

Back 5

Window Size

Front 6

Used to identify the application that generated the data to be sent to a destination machine.

Back 6

Source Port

Front 7

This field is used by the receiving machine to correctly reorder the segment stream into the same data stream that was sent by the source application.

Back 7

Sequence Number

Front 8

If turned on, this bit flags TCP to rebuild a lost connection to resume data delivery of a existing session.

Back 8

Reset Bit

Front 9

If turned on, this bit flags TCP to initiate the three-way handshake that establishes two-way connection-oriented communication.

Back 9

Syn Bit