Ok, I'll bite.  My official guess is:

access-list xx permit ip x.x.x.1 0.0.0.24

If I'm correct, I'll post how I did it later...right now I'm still
wondering... :-)  

Chuck, you're mean...just plain mean!

Good luck all!

John Neiberger

>  
>  
>  Come on, everyone. Where are you folks on this one? All you CCNA
candidates.
>  Show us your stuff. All you ACRC students - give it a try. I can't
believe
>  we haven't had a go round about this one.
>  
>  For the record, I have already filed my answer privately. It is a fun
>  puzzle, and one that will demonstrate your thinking skills.
>  
>  Who knows the answer? How do you know you're right????
>  
>  Chuck
>  
>  
>  Puzzle posed by Mike Williams:
>  
>  Make a (single line) access-list that will only allow traffic from
addresses
>  matching the following model:
>  
>  x.x.x.1
>  x.x.x.9
>  x.x.x.17
>  x.x.x.25
>  
>  It's along the same lines as the question you posed, but a little more
>  challenging since you only want those 4 addresses to pass through..... 
=)
>  
>  
>  
>  -----Original Message-----
>  From:        [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
>  Michael L. Williams
>  Sent:        Wednesday, June 28, 2000 7:27 PM
>  To:  [EMAIL PROTECTED]
>  Subject:     Re: ACL Question
>  
>  My newsgroup reader "claims" to have posted my response to this when it
was
>  first asked.  And for the record, I did have the correct answer and
>  explanation too =P.  So instead of posting yet another explanation on how
to
>  filter odd/even IP addresses, I'll post a similar but different question:
>  
>  Make a (single line) access-list that will only allow traffic from
addresses
>  matching the following model:
>  
>  x.x.x.1
>  x.x.x.9
>  x.x.x.17
>  x.x.x.25
>  
>  It's along the same lines as the question you posed, but a little more
>  challenging since you only want those 4 addresses to pass through..... 
=)
>  
>  If you want the answer without me posting it to the whole group (to keep
>  things fun), feel free to e-mail me and I'll reply via e-mail with the
>  answer.
>  
>  Mike W.
>  
>  
>  "Raymond Everson (Rainman)" <[EMAIL PROTECTED]> wrote in message
>  [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
>  > *Still* haven't figured this one out:
>  >
>  > Create an IP ACL, in as few lines as possible of course, which permits
>  > only even-numbered IP addresses.
>  >
>  > Ideas?
>  >
>  > Rainman
>  >
>  > ___________________________________
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