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Welcome to Jeremys IT Lab. This is a free, complete course for the CCNA. If you like these videos, please subscribe to follow along with the series. Also, please like and leave a comment, and share the video to help spread this free series of videos. Thanks for your help. Also, remember to download and use the Anki flashcards with the link in the description, which will help you very much in remembering what you have learned. Lets get started. In this video, were going to take a look at the Internet Protocol version 4, known as IPv4 header. This is used at Layer 3, to help send data between devices on separate networks, even on other sides of the world over the Internet. This is known as routing. Originally, I planned this video to be a general introduction to routing, but in the end I decided to split it up into separate parts. Lets take a look at what well cover in this video. Well cover the IPv4 packet structure, or more accurately, the IPv4 header which is used to encapsulat