This is very simple application, Talking about OSI (Open Systems Interconnection) model, And TCP/IP model.
Internet it's not required to run this application after download it.

Contents:
1- OSI model
- 7 Layers
- OSI figure
- Data transformation

2- TCP/IP model
- TCP/IP model
- TCP/IP layers
- TCP/IP figure

3- Ports
- TCP/UDP
- Commonly used TCP/IP port numbers

4- TCP/IP Classes

5- IEEE