OSI Summary

Application Layer 7
The Application Layer is where the data is created.

Presentation Layer 6
It takes information from the Application Layer and presents it in its
proper format.

Session Layer 5
The Session Layer’s job is keeping track of conversations.

Transport Layer 4
Makes sure that data gets there reliably

Network Layer 3
The Network Layer’s job is to decide how to get there

Data Link Layer 2
make sure the data gets to the physical devices it needs to

Physical Layer 1
Physical Layer is the layer that does the actual transmitting of data.