Sending a Message Accross the Internet

This web page is associated with a book called called The Animated Computer

The book can be bought at: https://play.google.com/store/books/details/Dr_Jerome_Heath_THE_EBOOK_ON_COMPUTER_DESIGN?id=WxOTBQAAQBAJ

The book gives excellent explanations for the animated images on this web site. This web page shows the animation of the computer designs in action. The book gives explanations of what the animations are about. Combining the books explanations with the animation provides a well rounded understanding of the animated computer.

A message is broken done into segments that, each, can be sent in one TCP Packet. The first packet starts at the very beginning of the message (here lorem ipsum) and can end at any character (byte) defined by the size of the packet payload.

First TCP Packet

Then that packet is sent to the IP level and it is encapsulated into the first IP packet as the message. The TCP packet is the data or message of the IP packet.

First IP Packet

Passing Messages by Packet

The message is given to the TCP layer. The TCP layer then breaks the message down into send-able units based on packet size. Each part of the message is wrapped in the TCP packet and sent down to the IP layer. The headers of the TPC packet keep track of the information necessary to keep this message together and in the right order at the other end. The IP layer wraps the TCP packet in an IP packet. The headers of the IP packet provides the ability of the packet to be sent to the the proper end point on the Internet (or in the local network). Each packet is sent along to the other end of the message process and particularly to the IP layer to start the interpretion and use on the other end.

To send this message it must be sent over the network. This is done through Ethernet in most organizations. Most commonly the Ethernet protocol is the same as the Internet (TCP/IP).

At the other end IP allows us to target the correct address for the message. Then TCP puts the pieces of the message back together in the right order and gives the result to the application (often the browser) at that end.

Ethernet takes care of the processes referred to as the Data Link Layer. The are circumstances when you actually need that layer to communicate with another entity. Them you need to connect. This is the original way of connecting: Data Link Layer. This demonstrates the connection and handshake in sounds.

The Animated Computer

Dr. Jerome Heath