Daisy Chain Versus Collapsed Backbone Architecture
Objective
This lab compares the application performance of two different network
architectures; Daisy Chain and Collapsed Backbone Network. In the case
of collapsed backbone data network, there is a core switch in the basement
equipment room. The core switch is linked directly to a workgroup switch on
each floor. Another option is to link the switches in a daisy chain. In this case
the basement core switch is linked directly to the first floor switch, the first
floor switch is linked directly to the second floor switch, and so forth.
This lab shows the application latency introduced by connecting building
switches in different ways.
Overview
An office building has 10 floors, each having many users connected to a 10Base-T
workgroup switch. The users share an Oracle server and seven file and print
servers in the basement.
In Scenario 1, the switches on each floor are daisy chained to the core switch
in the basement. We will see that this daisy chain approach introduces high
application latency to users on the highest floor.
In Scenario 2, the daisy chain topology is retained, but the core switch is
moved to the fifth floor. We will see that this reduces latency on the highest
floor but increases it on the bottom floor.
In Scenario 3, the core switch is kept in the basement, but a collapsed-
backbone topology is used, in which the core switch in the basement is linked
directly to the workgroup switch on each floor.
Lab Instructions
Step 1:
1. Start IT Guru.
2. Select File Open…
3. Scroll down to the project named MultiStory_Building_LAN, select it and
click OK.
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