Im studying the 100-105 Cisco book to trying and understand how auto summary works. Applying what is said in the last line of the last paragraph has me stumped as I can't see how replacing the 172.16.0.0 network on the left eliminates the discontigious network.
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I am glad that my explanation was helpful. It is unfortunate but things like this do appear from time to time in books despite the efforts of authors and proof readers. I hope they will recognize this and add it to their errata list.