next generation test questions:
when designing a network, CCNAs should pay particular attention to
a) the 80/20 rule
b) the 70/30 rule
c) the 50/50 rule
d) rule Britannia
at what layer of the OSI model does the 70/30 rule operate?
a) layer 1, because it relates to what bits are where on the wire
b) layer 2, because the bits are organized into frames, which use mac
addresses
c) layer 3, because the 70/30 rule refers to network layer design
d) layer 7, because a CCNA needs to apply his/her/its study to real world
situations
the 70/30 rule is
a) the result of extensive study which revealed that the 80/20 rule was in
error
b) the absolute measure of good design
c) the ratio of tab to tip when dining at a fine restaurant
d) Moises Alou's eyesight metric
hope I get my CCIE before I have to recertify for my CCNA! :->
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Priscilla Oppenheimer
Sent: Tuesday, August 14, 2001 9:54 AM
To: [EMAIL PROTECTED]
Subject: RE: ccna question [7:15958]
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
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