In this video, Bill Ferguson applies the final step of the four-step process to a Class A subnetting example. Learn how to determine the network, broadcast, and host addresses for each subnet without converting to binary.
- [Narrator] In our class A example,…the first Subnet will be the same as the network address,…only with the new Subnet Mask.…The first Subnet will be 10 dot zero dot zero dot zero…with the Subnet Mask of 255 dot 255 dot 254 dot 0,…which can also be expressed as a slash 23.…Now, the second Subnet and every Subnet after that…will be determined by the Increment.…The Increment is 256 minus the last number…in the Subnet Mask that's not a zero.…
In this case, the last number in the Subnet Mask…that's not a zero is 254.…256 minus 254 is two.…In the Increment we'll be Incrementing in the third octet.…Therefore, the next Subnet will be…10 dot zero dot two dot zero slash 23.…What will the Broadcast,…the Address right before the second Subnet,…what will the Broadcast be?…It'll be 10 dot zero dot one dot 255.…
Now, what happens is we think about the odometer again,…we're going to spin out the tenths and so we're going to go from…10 dot zero dot zero dot zero to…10 dot zero dot zero dot one, two, three, four, five, six…seven, eight, all the way up to 255.…
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