70/30? Who made that one up!?! ;-)
There's no exact number of course, but folk wisdom was always 80/20. 80% of
traffic stays local and 20% goes to a different part of the network. This
really got blown out of the water in the last 4-5 years because of
Intranets with corporate servers located centrally in server farms, a huge
amount of traffic heading out the door to the Internet, VPN and
remote-access traffic flowing back in the other way, a lot of AppleTalk and
Novell departmental servers being outlawed, etc. Some people have gone so
far as to say the equation has switched. 20% is local now and 80% is
non-local.
You would have to check traffic flows and volume on your own network for a
number you could really use. I have never seen 70/30. Is that really what
Cisco expects you to learn now? And which do they say is local and which is
non-local?
Priscilla
At 12:42 AM 8/14/01, you wrote:
>is that 80 local 20 non-local? with Cisco revising the number to 70 local
>and 30 non-local?
>
>I refer to Priscilla Oppenheimer's Top Down Network Design ( don't argue
>design without it :-> ) pp 20-21, the CID book written by Robert Padjen, pp
>26-27, and Howard Berkowitz's Designing routing and Switching Architecture
> wow! ), pages 35 and 575.
>
>Yes by all means learn the Cisco answer for the tests. Just remember that
>Cisco tests in certain respects are not particularly reflective of the real
>world, as at least three eminent real world experts indicate.
>
>Chuck
>
>
>
>-----Original Message-----
>From: Albert Y. Pak [mailto:[EMAIL PROTECTED]]
>Sent: Monday, August 13, 2001 9:03 PM
>To: Chuck Larrieu; [EMAIL PROTECTED]
>Subject: RE: ccna question [7:15958]
>
>
>The current theory is 80/20. However, to pass CCNA exam, the answer is
>70/30. ;-)
>HTH
>Albert
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
>Chuck Larrieu
>Sent: Monday, August 13, 2001 11:31 PM
>To: [EMAIL PROTECTED]
>Subject: RE: ccna question [7:15958]
>
>
>much as I hate to pass this one, because every response will hit the
>moderator's queue (x is a forbidden word), I thought this an honest
>question and that you were entitled to an answer.
>
>80/20 or 70/30 what?
>
>are you referring to the old "80 percent of your LAN traffic should be
>local, and 20 percent should be non-local" rule of good design?
>
>I haven't seen the recent Cisco study materials, but from other reading, I
>believe that current theory is that you can't go by this rule any longer.
>Internet access, shared services, centralized server farms, intranets, all
>have kinda blown all this local traffic versus non-local traffic percentages
>by the wayside.
>
>to transform a phrase of Brian Eno's - the one Scott McNealy probably stole.
>I know I sure did - the world is now the LAN.
>
>Chuck
>
>Eno: the recording studio is my synthesizer ( circa 1980 )
>McNealy: the network is the computer ( circa 1996 )
>Me: the telco network is the central office ( circa 1990 )
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
>Manjunath Shivaramaiah
>Sent: Monday, August 13, 2001 7:46 PM
>To: [EMAIL PROTECTED]
>Subject: ccna question [7:15958]
>
>
>hi
>i have a doubt regarding lan design in cisco....It is 80/20 or70/30 ......in
>x and 604-407 books it says it is 70/30...pl help me in this
>regard...
>I'm taking ccna exam shortly
>
>thanks
>
>manjunath.s
________________________
Priscilla Oppenheimer
http://www.priscilla.com
Message Posted at:
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