What is OSI model ? and What is the first step to diagnose the Network Problem when Computer has not connect with the network?

OSI (Open Systems Interconnection) is where you can diagnose the network layer or DATA communication in between your network systems. And its the best practice for trouble shooting and escalate any defects of the DATA link communication and throughput into the DATA Center up to client or customer computer desktop or devices that connected to the network and systems.

OSI Models Stands for Open System Interconnection. It is use to diagnose the network problem step by step when System not connected to network..