So now we have made the computing ( Networking ), we know the cabling technology we use, we know which jack it goes to, you know what device it is connected to, we know the identity of computer (MAC Address also known as physical address) and now we know how these are connected like LAN,WAN,MAN. Let us see how exactly the two computers will communicate in a Local Area Network, so the LAN is I have two computers which are present in my office connected to each other, let us see how these two computers communicate with each other. So as shown above we have computer A and computer B, so if computer a wants to communicate with computer B inside a small campus, so it should have an addressing style, let us say in my office I have two points each point should have a naming convention, as we have already defined the name of two computers for the whole world. We have to define a nick name to both computers to communicate on LAN, which we can define with a protocol with rule, what is that...
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