In this video, Bill Ferguson applies the final step of the four-step process to a Class C subnetting example. Learn how to determine the network, broadcast, and host addresses for each subnet without converting to binary.
- [Instructor] So in our current example,…we've determined that our subnet mask…is going to need to be 255.255.255.224,…which is equivalent to a /27,…and that will get 30 hosts per subnet.…But what will the IP addresses really look like?…Well, the first network will be the same…as the network that we started off with,…only with the new subnet mask.…Well, the first subnet will be the same…as the network that we started off with,…only with a new subnet mask.…
So the first subnet will be 192.168.1.0/27,…and every other subnet will be based on the increment.…Now, the increment is 256 minus the last subnet mask number…that's not a zero.…Now, we don't have any zeros at the end right now…because we're on class C.…But if you'll remember that, it'll make a lot more sense…when we look at class B and class A.…
So in this case, it's just 256 minus the last number…in our subnet mask, which is 224.…That means the increment is 32,…and it's incrementing in the fourth octet.…That means that the next subnet is 192.168.1.32.…Now, I like to bracket it in…
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