I’ve been doing support for a long time and I’ve configured network settings repeatedly over the course of that career, but if I were to be completely honest I’d have to admit that I haven’t a full understanding of how the TCP/IP protocol works in general or subnets in particular. I just know that some things need to be set up a certain way and everything works. It’s one of those things that I’ve been meaning to get around to teaching myself someday, but never have.
Then I stumbled across IP subnetting made easy by George Ou and I can now die a happy man:
IP subnetting is a fundamental subject that’s critical for any IP network engineer to understand, yet students have traditionally had a difficult time grasping it. Over the years, I’ve watched students needlessly struggle through school and in practice when dealing with subnetting because it was never explained to them in an easy-to-understand way. I’ve helped countless individuals learn what subnetting is all about using my own graphical approach and calculator shortcuts, and I’ve put all that experience into this article.
Granted, this is probably way more technical than a lot of you care to get, but I know I have a few fellow support people who read SEB and they may be in a similar boat of not really ever having bothered to learn subnetting so I thought this might prove useful to them. Plus it acts like a bookmark for my future reference.
Hat tip to SunbeltBLOG.