Data Encapsulation Continued
As the layers pass the data through the stack, the header (and sometimes trailer) of the upper layer is wrapped in the header of the next-lower layer.
This wrapping is called encapsulation.
Once the receiving device gets the data packet, it begins moving the packet up through its layers.
The header information is examined by the layer for which it is intended.
Then the header is stripped off and the data packet is sent up to the next layer where the process continues.