What's The OSI Model
Dwaine "Rob" Roberts
On A Mission To Help People, Girl Dads, & Businesses Elevate
OSI Model: The 7 Layers Of Networking
What's The OSI Model? Since we can't actually see what happens when we send an email, the Open Systems Interconnect (OSI) model was created to represent data traveling through the network. The OSI model takes a layered approach starting at the physical equipment and goes up to the application layer then back to the physical layer. This model allows users the ability to understand the 1 and 0's (binary) of networking. Let's look at every layer a little more in-depth.
OSI MODEL LAYERS
Layer 7 - Application Layer
The Application Layer is what you're using to read this blog. This layer houses all the applications a user will interact with. Examples are Chrome, Safari, Facetime, Internet Explorer, Etc
Layer 6 - Presentation Layer
The Presentation Layer decides how things are presented to the user. It's responsible for encryption and decryption as well. For example, when you log into your online bank the presentation layer ensures that the information is encrypted via SSL.
Layer 5 - Session Layer
The Session Layer is responsible for initiating and terminating sessions. So whenever you need to communicate with another person or device, the session layer makes it possible.
Layer 4 - Transport Layer
The Transport Layer is responsible for transporting data. It accomplishes this via two methods. UDP and TCP. UDP transmission is very fast but maybe unreliable, while TCP is slower but very reliable.
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