Chapter 15. Analyzing Existing Subnet Masks

When you examine an existing subnet design, you can learn a lot about the subnetting design by analyzing the subnet mask. First, the mask divides addresses into two parts: prefix and host. Then, the network class further subdivides the addresses, breaking the prefix part into the network and subnet parts.

Once you know the size of the three parts of an IP address, you can make ...

Get CCENT/CCNA ICND1 640-822 Official Cert Guide now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.