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TRANSMISSION CONTROL PROTOCOL (TCP)

Introduction:

The Transmission Control Protocol (TCP) is one of the core protocols of the

Internet Protocol Suite. TCP is one of the two original components of the suite,

complementing the Internet Protocol (IP), and therefore the entire suite is

commonly referred to as TCP/IP. TCP provides reliable, ordered delivery of a

stream of bytes from a program on one computer to another program on another

computer. TCP is the protocol that major Internet applications such as the World

Wide Web, email, remote administration and file transfer rely on. Other

applications, which do not require reliable data stream service, may use the User

Datagram Protocol (UDP), which provides a datagram service that emphasizes

reduced latency over reliability.

For TCP communications, the client must connect to the server first before any

data exchange can take place.

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HOW TO CONDUCT THE EXPERIMENT:

SERVER:

Click on Transport Layer on the Main Window and Then Select “TCP” Module

from the Modules displayed in the centre of the window.

TCP Protocol Window will open up as shown in SNAPSHOT-1.

SNAPSHOT-1

1.  Click on “START SERVER” button to start the TCP Server. The Server will

Start and wait for incoming connections from the client.

2.  Once Client Establishes Connection with the Server, “DATA” textbox and

“SEND” button is enabled and “SOURCE IP”, “DESTINATION IP”, “SOURCE

PORT” and “DESTINATION PORT” is populated with the actual values. 

3.  Enter the data in the “DATA” textbox and click on “SEND” button to send

Data to the Client.

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4.  Any Incoming Data is Displayed in the box at the bottom of the Server

Control as shown in SNAPSHOT-2

SNAPSHOT-2

5.  Click on “STOP SERVER” to stop the server. The Server will no longer service

any requests from the client.

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CLIENT:

On the Client Window,

1.  Enter the IP Address of the Server you wish to connect to.

2.  Click on “CONNECT” button to connect to the Server. 

3.  On Successful connect, “DATA” textbox and “SEND” button is enabled and

“SOURCE IP”, “DESTINATION IP”, “SOURCE PORT” and “DESTINATION

PORT” is populated with the actual values. 

4.  Enter Data in the “DATA” textbox and click on “SEND” button to send Data

to the Server.

5.  Any Incoming Data is Displayed in the box at the bottom of the Client

Control as shown in SNAPSHOT-3

SNAPSHOT-3

Use Loop back Address “127.0.0.1” if Server is running on the same

computer.

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Server and Client Messages are Displayed in the “Message Window” on the

extreme right.

Reset Button:

Click On “RESET BUTTON” to reset all the controls to initial values.  

Click on “HELP BUTTON” to Open TCP Manual.

Click on “EXIT BUTTON” To Close TCP Window.

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