In this video, Bill Ferguson provides audio queues to use the four-step subnetting method to determine the subnet address, broadcast address, or host range from a host address. Review this video as you practice subnetting in your head.
- [Instructor] Starting with the IP address…and the subnet mask, determine the subnet address,…the broadcast address, and the valid host range…in the subnetwork.…That's the goal.…So to begin, look at the subnet mask…to determine the increment and the octet…in which we are incrementing.…Now, to determine the increment, add the value of those bits…and subtract that from 256.…
Now that I have the increment, I'll apply that info…to the last octet that contains the subnet mask bits.…Using that increment, I can determine the closest subnets…to my host address.…I'll add one to the subnet address…to determine the first valid host in the subnet.…
To determine the broadcast address of the subnet,…I'll increment from the subnet address and subtract one.…Then the host range includes all of the addresses…between the subnet and broadcast addresses.…
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