Connected Vs. Communicating - Intro to Data Communication

 

There has been confusion about connected devices and communicating devices. Two connected devices may or may not communicate, but every communicating device is connected that is for sure.

Suppose, there are two PCs, A and B, and a ‘copper cross over’ wire is attached with the respective ports of PCs. It means they are connected, by that wire. The diagram shows two PCs connected. But they are not communicating. Why?

Because they do not have the protocol (agreement). Two devices may be connected but not communicate without the protocol or agreement, just like a person talking in Hindi cannot be understood by a person knowing only Malayalam. They have to speak the same language which is understood by both.

Also, we have to make understand the devices that through a proper route, you can easily talk.

I have provided the IP address on both PCs and made them understand to read the message if the message has the same address as the IP address of that device. They will exchange messages by giving the address of the other PC. So, PC A will send a message in which the IP address of PC B is written, and vice-versa. Now they are called communicating devices.