In this video, Bill Ferguson applies the first three steps of the four-step process to a Class C subnetting example. Learn how to determine the new subnet mask and network size without converting to binary.
- [Instructor] By far the best way to understand…this method is by applying an example.…So let's look at a Class C example.…So what if we had one network 192.168.1.0/24,…but what we wanted were eight subnets.…Then what would our subnet mask need to be,…how many hosts would we end up with per subnet,…and what would be the addresses that would actually…be in the subnet?…Now we're going to use the four step method.…
So the first step is where am I now?…We're going to determine where we are…based on the subnet mask.…Since the subnet mask is a slash 24 which is equivalent…to 255.255.255.0,…we are therefore in a hole between…the end of the third octet and the beginning…of the fourth octet.…That's where we start.…So the next question is how many of these bits moving…from the left toward the right in the fourth octet…are we going to need to use to create eight subnets?…That formula is always the same.…
It's two to the power of S, has to be greater than…or equal to the number of subnets.…In this case the number of subnets is eight,…
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