The essential concepts and principles that form the foundation for designing, implementing, and managing computer networks, encompassing hardware, protocols, and communication methods.
The OSI (Open Systems Interconnection) model provides a straightforward and intuitive framework for standardizing the various components necessary for communication across networks.
By dividing the requirements into multiple layers, the model clarifies what is needed for effective network communication. Here’s what the OSI Model looks like:
|
Layer |
What it does |
|
7 – Application |
Where humans analyze and interpret data and information. |
|
6 – Presentation |
Ensures data is formatted for usability. |
|
5 – Session |
Able to sustain connections. |
|
4 – Transport |
Data is directed to a service that can process requests. |
|
3 – Network Layer |
Determines the route that packets should take across a network. |
|
2 – Data Link |
Manages which physical devices packets should be directed to. |
|
1 – Physical |
The physical framework for transmitting data. |