CCENT/CCNA ICND1 100-101 Official Cert Guide

The Process to Find the Best Summary Route

To find the best summary route, you can use trial and error, use educated guesses, use a subnet calculator, or use any other method you like. For the purposes of CCENT and CCNA, using a simpler decimal-based process to find the best summary route probably makes the most sense. The process uses familiar skills: taking a subnet ID/mask and finding the subnet broadcast address, as discussed back in Chapter 14, “Analyzing Existing Subnets.” If you can do that math with confidence, this process should be no problem. (If not, consider going back to review subnetting math from Chapter 14 before finishing this chapter.)

Here are the steps for finding the best summary route, using decimal math, with some examples ...