In this video, Bill Ferguson explains how subnetting in your head can boost your self-confidence in any networking endeavor. Understand why the ability to look at a network topology and immediately see where there are issues in regard to IP addressing, even when custom subnet masks are being used, will set you apart on your networking team.
- [Instructor] The ability to subnet in your head will boost your confidence when you're talking about networking. You'll know when looking at a network topology what your're really seeing, what's really connecting, and how you would follow those packets, and whether that should work. You'll be able to learn a new networking concept without having to always be remembering how to do the subnetting. You'll be able to understand the packet flow, and what's supposed to happen next.
In regards to troubleshooting, you'll be able to look at a router and the interfaces that are on the router and the IP addresses that are there, and know whether they should work or not for that particular topology. If it's network-addressed translation that you're trying to learn, then you'll know about the IP addressing already, and it will become second nature, so you'll be able to quickly look at the problem and be able to determine the solution, because you won't be caught up in trying to figure out the IP addressing.
It's the same thing with access control lists. Access control lists can be very difficult to learn if you don't understand the subnetting. On the other hand, they're rather simple when you do. Any kind of network topology that you look at is going to have IP addresses on it. You'll be able to know whether those are the proper IP addresses, and whether those topologies should operate with those addresses.
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