The concept of layers
Texte du Storyboard
- HI, THIS IS THE MESSAGE I WANT TO SEND
- SEND
- DEC 19
- 1. SOURCE COMPUTER - THIS IS THE COMPUTER THAT YOU WANT TO SEND THE MESSAGE FROM.
- 2. APPLICATION LAYER - THIS TELLS US WHERE WE WANT TO SEND THE MESSAGE, AND GIVES IT AN APPROPRIATE SUB HEADING. FOR EXAMPLE IF IT WAS GOING TO A WEB BROWSER YOU WOULD USE HTTP.
- 3. TRANSPORT - THEY ARE RESPONSIBLE FOR BREAKING DOWN THE MESSAGE INTO PACKETS, ORDERING THE PACKETS, NOTING WHAT SOCKET TO USE AND SUPPLYING AN END TO END CONNECTION SO THE PACKETS CAN BE TRANSMITTED.
- NEW MESSAGE
- HI, THIS IS THE MESSAGE I WANT TO SEND
- 19 DEC
- 4. NETWORK - GIVES THE PACKETS A SOURCE IP ADDRESS AND A DESTINATION IP ADDRESS SO THE ROUTER KNOWS WHERE ITS COME FROM AND WHERE ITS GOING TO. NOW WE KNOW THE DESTINATION AN THE SOCKET.
- 5. LINK - THIS IS RESPONSIBLE FOR THE PHYSICAL CONNECTION BETWEEN NODES, IT ADDS A UNIQUE MAC ADDRESS FOR THE SOURCE AND DESTINATION. THE MAC DESTINATION IS CHANGED AT EACH HOP.
- 6. DESTINATION COMPUTER - THE COMPUTER THAT WAS MEANT TO RECEIVE THE MESSAGE.
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