Join Bill Ferguson for an in-depth discussion in this video Next steps, part of Subnetting in Your Head.
- [Bill] Throughout this course we've looked at examples of subnetting, examples of how IP addresses can be used that will connect to each other and how IP addresses that are improper won't connect to each other. But those are just examples. There are thousands and thousands of examples. My suggestion to you is practice, practice, practice.
Look at example after example after example. You may be thinking, "But Bill, where am I going to get all these examples?" Well, a fantastic site that was developed by Todd Lammle and others is called subnettingquestions.com. If you go to www.subnettingquestions.com, it just gives you question after question after question, and then the appropriate answer. In my experience it's very accurate.
If you're not getting the answer that they have, you're probably wrong, so keep working on it. You should be able to get to where by the time you finish reading the question, you already have an idea of the answer. That's how fast you can get if you keep practicing so that you can actually subnet in your head. You'll find that you're seeing the answers as you finish the question, instead of having to figure it out after you finish the question.
Now, as tools for additional practice, we've included a couple of course handouts. One is called The DNA of IP Addressing. The other is called The Subnetting Worksheet. These are tools that you can use to keep it straight and to begin to build that mental imprint. But I don't want you to feel like this is something that you have to memorize or have to recreate in order to solve a subnetting problem.
I want you to be able to use these tools to get the method down in your mind, to have the mental imprint so that you can accurately subnet in your head, and so that you can do it very quickly. Then you won't need the tools anymore. That's the goal. Best of luck with the four-step subnetting method. I hope that it enhances your IT career.
Discover how IP addresses are constructed and how to understand them better by relating them to a picture rather than converting binary numbers or memorizing charts. Learn the benefits that subnetting in your head provides in every aspect of IT networking, including routing protocols, access control lists, and network address translation. Then walk through Bill's four-step method, which leverages the rules that were used to create the original classful IP addressing schemes. Using this method, students can learn to "see" the IP addresses for each subnet. Watch the technique in action, and then practice what you've learned using the audio guides in chapter five, which provide auditory cues as you subnet in your head.
- The benefits of subnetting
- Class A, B, and C IP addressing
- The four-step subnetting method
- Troubleshooting IP topologies and IP host address ranges
- Audio cues for the four-step method