The OSI model summary

The OSI model consists of seven layers that form a structured system which is responsible for all network communication between computers. Below is a brief summary of all OSI model layers.

1. Application layer - contains all protocols and methods that fall into the realm of process-to-process communications.
2. Presentation layer - is responsible for the delivery and formatting of information for further processing or display.
3. Session layer - provides the mechanism for opening, closing and managing a session between end-user application processes.
4. Transport layer - defines protocols that are responsible for encapsulating application data blocks into data units (segments, datagrams) suitable for transfer to the network infrastructure.
5. Network layer - is responsible for end-to-end packet transmission including routing through intermediate hosts.
6. Data link layer - defines a protocol which is responsible for transferring data between adjacent network nodes.
7. Physical layer - defines all physical aspects of a network connections.