To download mp3 (audio): Click "Download mp3" button
To Cut/Crop mp3: Please use the slider below and click on "Download mp3" button to download the selected part.
Note that video to mp3 conversion output is limited to 10 minutes.
This is the big picture explanation of the TCP/IP protocol and how it maps to the OSI model. The big picture covers the OSI model layers and their functions, TCP/IP layers, functions, PDUs and addressing. Then it shows how the many different network devices are mapped to the TCP/IP protocol.