TCP / IP is the most important model in the system structure. If you want to know more about howthe computer deal with the order which you input.You must study TCP / IP well.For example, now we want to surf online. Input the website "www.cisco.com" .then the computer will change thewords to ASCII (just a example ..) and send it to Application layer. Application layer receive the data, will add message to show where and how the data will send. now the data have arrivedat transport layer, here the data will be made into segment and sent. When the segment reach Network layer, it will be made into packet and then sent to Data link layer. In the Data link layer, the packet become framing NOW The Framing Arrive Physical Layer. "Hi, Welcome. But I will send you to the host which named 'www.cisco.com'" The Physical Layer SAID. IT IS RIGHT? IN FACT, The Physical Layer Don '
