OSI
Open Systems Interconnection model
What is OSI?
OSI model is a suite of protocols, or rules, to govern how computers communicate with one another.
Layers
Physical layer: standards for transimitting raw data (bits)
Data link layer: standards for transferring data between network nodes in WAN or LAN segment
Network layer (L3): communication across different networks.
Transport layer: transfer of data between users. This layer provides the ack of the successful data transmission and sends the next data if no errors occurred.
Session layer: mechanism for opening, closing, and managing a session between application processes.
Presentation layer: is responsible for formatting and delivering information to the application layer. It translates data based on syntax.
Application layer (L7): user interacts directly with this layer.
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