In this video, Bill Ferguson explores a typical network address translation problem, much like one you may see in the real world. Apply the four-step subnetting process to this problem.
- [Narrator] Imagine yourself trying to configure…network address translation.…That's what your focus is on.…You've been given a pool of addresses,…and the pool goes from…192.168.1.11…through 192.168.1.24,…and you are considering using a subnet mask…of 255.255.255.240.…
Will that subnet mask work for that pool of addresses?…So, what's the first question?…Let's look at the pool.…How many addresses are in the pool?…There are 14 addresses in the pool,…from 11 to 24, although that looks kind of funny.…If you were to actually count those numbers,…that's 14 hosts.…Now then, how many addresses will your subnet mask…that you're proposing…of 255.255.255.240 support?…The first question is, where am I now?…If you think about it,…you are in the fourth octet…and you are four bits over.…
You've split the fourth octet in half.…How many more bits does that leave for hosts?…It leaves four bits.…If I have four bits for hosts,…then the formula is two to the fourth minus two.…Two to the fourth is 16 minus two is 14.…Therefore, you have 14 hosts that you need to support…
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