CCENT/CCNA ICND1 100-101 Official Cert Guide

Practice Problem 3

Table I-6 Practice Problem 3: First Two Steps

For Problem 3, at Step 3, all the original masks are /25, so the initial mask will be one smaller, or /24. Finding the correct answer requires four passes through calculating a new subnet ID and mask, with the final answer shown in Table I-7.

Table I-7 Practice Problem 3: Multiple Passes Through Step 4 (Correct Answer Highlighted)

The best summary route will use subnet ID 172.22.96.0, mask /21.