What is OSI Model?
In the simple words OSI model in CCNA helps in framework for implementation and creating networking device and describe how the network applications on different systems can communicate with the network media. Below are the step-by-step instructions with examples:
Segments – Port number – http 80, https 443
Packet – Source Ip address | Destination Ip address
Frame – Source mac address | Destination Mac address
The applications which help humans to interact with each other.
Presentation Layer.
This layer is responsible for the representation of data.
Image : Jpeg, png, img
audio : mp3, wav
video : mp4, avi
It is used to present data to the application layer (layer 7) in an accurate, well-defined and standardised format.
Encoding means converting data into 0 & 1.
Encrypt – Atul – slakfhjalskfjhsal;fj123
Compression – Reduce the size