From: Paul Martinez (pmartinez@xxxxxxxxxxx)
Date: Mon Mar 20 2000 - 21:18:46 GMT-3
Under Free stuff - Study Guides you will find a shortcut method.
It's pretty good. Check it out.
Paul M
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Ronald Johnson
> Sent: Monday, March 20, 2000 2:14 PM
> To: ccielab@groupstudy.com
> Subject: Wildcard Masks
>
>
>
> I am having some trouble with access list and distribute-list questions that
> ask you to filter a specific range of network or host addresses. Reading
> through Caslow's book I ran into a section entitled "A Suggested Approach to
> Constructing Access-lists that Manipulate a Range of IP and Decnet
> Addresses" (Page 677). Caslow proceeds to describe what seems like the most
> convoluted and drawn-out process to determine specific masks that allow you
> to filter hosts on a very granular basis. Caslow's method asks you to put
> together a number chart that shows all of the subnet borders in a huge
> chart. e.g.
>
> 128
> 64 192
> 32 96 160 224
> 16... and so on
>
> Trying to write this out during the lab exam would probably kill 15 minutes
> of your time..
> Not only that, the chart is only a beginning. Caslow's method is so
> complicated and time consuming, it leads me to wonder if there is an easier
> and quicker way to create these types of access lists masks..
>
> Caslow Example:
>
> Q: Permit hosts 10.10.10.40 through 49 to be permitted network access while
> blocking all others.
>
> A: access-list 10 permit 10.10.10.40 0.0.0.7
> access-list 10 permit 10.10.10.48 0.0.0.1
>
> Is it just me? Is his formula actually fast and simple and I am simply
> lacking the
> gray cell power? :D
>
> I have had a very hard time finding another tutorial or shortcut for this.
> Anyone
> have a better method out there? I would really appreciate your time in
> responding.
>
> Thanks!
>
> -Ron
>
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