Computer/OSI model

OSI model

This is an imaginary layered communication of computer connection. Here we have seven layers. Computers are connected and communicate each other as we experienced in our life. When computer communicate they use protocols. They use different protocols depending on the occasions. All the protocols are allocated in one of the seven layers.

1. Physical layers: Drivers
2. Data link layers: Ethernet (very popular network system)
3. Network layers: IP
4. Transport layers: TCP, UDP
5. Session layers: POP, log in
6. Presentation layers: Encryption
7. Application layers: DNS, e-mail

(Layer name: protocol examples)

We can use these sentences to memorize all the layers: “Please Do Not Throw Sausages Pizza Away”, “All People Seems To Need Data Processing”.

http://en.wikipedia.org/wiki/OSI_model