22 February 2014
Ken Long - firstname.lastname@example.org or email@example.com
One of the most important skills one needs to learn to become a Network Administrator is subnetting. These pages show what I've learned at CNM on this subject. In all of my classes so far, I've been taught the bare-bones way to subnet. That means using binary math, bit-wise ANDing, and conversion between binary and decimal. While this may appear extremely complicated to some people, learning to do it this way illustrates the "why" of the process in ways that those shortcuts and tricks can never do. If you learn how it works you'll be way ahead of the game.
The step-by-step procedure I learned.
A practical subnetting problem.
A challenging subnetting problem from the book.
Mistake #1 from David Clauss' IP Subnet Problem Generator
Mistake #2 from David Clauss' IP Subnet Problem Generator
I now find myself in Spring 2014, my last semester, and I need to review some new subnetting subjects I learned last fall and some new subjects.
Route Summarization in Reverse
ACL Wildcard Masking
Lastly, here are links to other subnetting sites:
Generator (David Clauss)
Multi-mask Subnet Problems (David Clauss)
A basic GNU Subnet Calculator (this one does wildcard masks!)
A more full-featured Subnet Calculator
Subnetting Practice and Game
New CNM North (as of April 2014)
Thanks to David Clauss, James Hart, David Beach, Steve Perry, and Bob Hennigan at Central New Mexico Community College for taking me this far. I'm sure I'll refine this as more of the steps become second nature and I more fully understand the underlying mechanics of it all.