At 11:44 AM +0000 2/25/03, Troy Leliard wrote:
>It depends if you are after theoritical advice, or practical advice. I have
>found it rare to have only L2 in the core (other than when using MPLS). The
>focus of the exam is that the core should add minimum latency to forwarding
>decisions, and thus the empahsis on why ACL's, VLAN aggregation etc, should
>all be done on the distribution / access layers, leaving the core to be very
>efficient.
>
>Not sure if this answers your question, but just my 2cents on what I have
>dealt with in the past!
>
>Cheers
>Troy
>
>Skarphedinsson Arni V. wrote:
>>
>> In a Core-Distribution-Access Layer design, would you keep the
>> Core L2 or with high end L2/L3 switches such as the Cat6500 do
> > you think it would be better to do L3 in the core ?
Again, remember core-distribution-access is only a model. There are
perfectly valid implementations of this model that:
-- have L2 WAN cores and no L3
-- have L3 WAN cores
-- have L2 LAN cores and no L3
-- have L3 WAN cores
As Troy says, it depends on why you are asking the question. Without
further advice, I'd tend to agree with his practical advice.
If it's exam-oriented, it depends on the exam. When I taught the CID
course, it would never have been this restrictive in the actual class
(i.e., the case studies would have more data). Whether some droid
oversimplified the problem to an extreme as a test question, then the
answer really depends on went on in the twisty little passages of
their little minds.
Howard
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=63716&t=63708
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