IPv6

We've heard the term IPv6 here and there, but what is it? Every device that connects to the Internet gets it's own IP address, well that happens to be a finite number that we are soon approaching in this digital age. IPv6 was created to allow us to connect more hosts to the Internet, it comes with more IP improvements however, it's adoption is quite slow. It isn't meant to replace IPv4, they are meant to complement each other. The two IP protocols are very similar and if you know IPv4 you'll understand IPv6, the major difference is the way the address is written. Here is what a typical IPv6 address looks like:

2dde:1235:1256:3:200:f8ed:fe23:59cf

Subnet arithmetic is the one part of networking in this course that you can genuinely finish learning, and these seven lessons are most of it. What is left out is everything about running it at scale: address planning across an organisation, why IPv6 adoption has taken thirty years, and how NAT quietly changed the shape of the internet. Computer Networks: A Systems Approach covers the ground properly and is free online.