Before starting, we fly a little bit under some network basics, starting from the multi-layered model and the encapsulation and de-encapsulation concept, through some other technical information.
Basic overview
OSI model
The OSI model is a conceptual model that is used to describe how data flows in a network from one device to another. We know that there are seven layers, and layer 1 is the lowest. For details, see https://en.wikipedia.org/wiki/OSI_model:
![](https://static.packt-cdn.com/products/9781787286016/graphics/assets/5194f4a2-1905-43a0-b0d4-f8783a51bcf0.png)
The OSI model
Encapsulation and de-encapsulation
Information that is transmitted over the network must undergo a process...