The best way to understand the 3 layer model is to memorize ( as much as you
can ) what takes place at each layer, especially the important aspects..
such as high speed switching is done at the core layer, access lists and
filtering should be done at the access layer, etc... Cisco Press CCDA
exam guide is good for learning this. Probably also Prescilla's Top Down
Network design would include this.
Cory
-----Original Message-----
From: Ole Drews Jensen [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, May 23, 2000 10:42 AM
To: '[EMAIL PROTECTED]'
Subject: Cisco's Three Layer Model
(this e-mail is best viewed with a fixed font like Courier)
I can't seem to picture the theory behind Cisco's 'Three Layer Model' with
Core, Distribution and Access layers.
Below, I have designed a minor network where the headquarter's LAN is made
up of three switches (1,2 and 3) and they are connecting to four branch
offices via a WAN connection from router 1 and 2. Router 1 connects the
first three branch offices via Frame Relay, and Router 2 connects the last
office via DSL.
Can someone kindly match the right layers (core, dist. or access) with the
right switches and routers?
Also, if someone has a very good way of explaining this, I would appreciate
it.
=======================
R-n = Router Number n
S-n = Switch Number n
-----------------------
PRN = Printer
SVR = Server
W = Workstation
=======================
1GB BACKBONE
---------------------------
| | |
[S-1] [S-2] [S-3]
W-------||||| SVR--||||| SVR-|||||
W--------|||| SVR---|||| SVR--||||
W---------||| W------||| PRN---|||
W----------|| W-------|| PRN----||
W-----------| | |
| |
~~~~~~~~~~~~~~~~~~~~~~~~~~~~[R-1]~~~~~~~~[R-2]~~~~~~~
| |
| |
FRAME RELAY DSL
| | | |
[S-4] | | | | [S-7]
|||||--[R-3]-----------| | | [R-6]------|||||--W
W--|||| | | ||||---W
W---||| | | |||----W
W----|| [R-4] | ||-----W
W-----| |-------| | |------W
[S-5] [R-5]
| |
W |
[S-6]
| |
W W
Thanks in advance,
Ole
~~~~~~~~~~~~~~~~~~~~~~~~~
Ole Drews Jensen
Systems Network Manager
CCNA, MCSE, MCP+I
RWR Enterprises, Inc.
[EMAIL PROTECTED]
~~~~~~~~~~~~~~~~~~~~~~~~~
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