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Beginner

Understanding auto summary

Hi all,

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.

 

Thanks

Nick Screen Shot 2018-02-19 at 2.25.15 PM.png

1 ACCEPTED SOLUTION

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Hall of Fame Master

Re: Understanding auto summary

I agree with you that the last part of the paragraph is poorly written (or that it is just plain WRONG). Logically it should have said to use a third classful network on the left in place of network 10.0.0.0.

 

HTH

 

Rick

HTH

Rick

View solution in original post

3 REPLIES 3
Highlighted
Hall of Fame Master

Re: Understanding auto summary

I agree with you that the last part of the paragraph is poorly written (or that it is just plain WRONG). Logically it should have said to use a third classful network on the left in place of network 10.0.0.0.

 

HTH

 

Rick

HTH

Rick

View solution in original post

Highlighted
Beginner

Re: Understanding auto summary

Thanks Rick,
It was driving me crazy cuz I just thought I was having trouble with the concept of classfull networks! I checked the books errata but nothing was listed.
Thanks again
Highlighted
Hall of Fame Master

Re: Understanding auto summary

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.

 

HTH

 

Rick

HTH

Rick
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