In this video, Bill Ferguson shares the addresses set aside for use in a private network. Learn why these addresses are always filtered on the backbone routers that give access to the internet.
- [Instructor] There are specific ranges of addresses…that are said to be "nonroutable".…Now, I'm using the term in quotes here because,…in my opinion, that's not the right term to use.…There's nothing wrong with the addresses.…There's nothing wrong with their ones and zeros,…that causes them to not be routable.…The designers that put the internet together…also made it a standard…that these addresses would be filtered…so that I can use them and you can use them,…and even if the firewalls…that separate us were to come down,…there are other firewalls and filters that would keep us…from seeing each other and having conflicting addresses.…
The addresses that are nonroutable…include anything that starts with a 10,…anything that starts in the range of 172.16…through 172.31…inclusive,…in other words, 172.16.0.0…through 172.31.255.255,…and 192.168,…anything that starts with 192.168.…
These are the nonroutable addresses for…Class A,…Class B,…and Class C.…In addition, the designers held back…everything that starts with 127,…the entire 127 network inclusive,…
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