Problem 4
Table 21-10 Practice Problem 4: First Two Steps
For Problem 4, at Step 3, the shortest mask is /24, so the initial mask will be 1 smaller, or /23.
Table 21-11 Practice Problem 4: Multiple Passes Through Step 4
Table 21-11 still does not show the correct answer. If you keep going, it will take you all the way to /16 before you find the best summary: 172.16.0.0/16.
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