From: John Ciccone (ccie.ciccone@gmail.com)
Date: Tue Feb 17 2009 - 11:19:33 ARST
On Tue, Feb 17, 2009 at 7:31 AM, Cisco certification <ccielab@groupstudy.com
> wrote:
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> --- Original Message Follows ---
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> Date: Tue, 17 Feb 2009 07:31:19 -0500
> Subject: Block RFC 1918 addresses
> From: John Ciccone <ccie.ciccone@gmail.com>
> To: ccielab@groupstudy.com
>
> I recently took a vendors mock lab where the task asked block all RFC1918
> adddress. So, I created an access-list and applied it to deny the
> following:
>
> 10.0.0.0/8
> 172.16.0.0/12
> 192.168.0.0/16
>
> I've read RFC1918 from top to bottom, and the above addresses are the only
> ones mentioned. However, upon checking my answers with the solutions, they
> also included the following:
>
> 127.0.0.0/8
> 169.254.0.0/16
>
> Now, while the above addresses are not valid internet addresses, they are
> NOT RFC1918 addresses. If the question stated that I should block non
> valid
> internet addresses, then I could see denying the two ip blocks above as
> well. But even in that case, there are at least a half dozen more ipv4
> blocks that are either not valid or not yet allocated for the internet.
>
> My main question is this: If I get the same type of task on the actual lab,
> what do I do? Will the questions be specific enough to leave no doubt
> as to what they are looking for (not only for this type of questions, but
> any others as well)? If there are any doubt's about what they are looking
> for, how helpful will the proctor be in clarifying?
>
> I am scheduled to take the lab in 3 weeks, so any help would be greatly
> appreciated.
>
> John
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