In this video, Bill Ferguson applies the first three steps of the four-step process to a Class A subnetting example. Learn how to determine the new subnet mask and network size without converting to binary.
- [Instructor] For our class A example…I'm going to use something that some people call 10 netting,…because we're starting off with a network…10.0.0.0.…As you may recognize that's one network that can support…16,777,…214 hosts, but I don't need…16,777,214 hosts.…I need 500 hosts per subnet.…
So what I want to know is…what would my subnet mask need to be?…How many subnets would I create?…And what would the addresses look like?…So to determine what my subnet mask needs to be…first I need to ask the first question…in the four step method, which is where am I now.…Where am I now is answered by…the subnet mask slash eight.…That means that right now I am at the end…of the first octet in a hole between…the last bit of the first octet…and the first bit of the second octet.…
All of those bits to the left are network bits…that won't be changed.…The question is…how many of those 24 bits to the right…are going to need to be host bits…and then how many will be left to be subnet bits?…That will determine my subnet mask.…So the formula…
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