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Design , implementation and management of secured lan

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par Eliud Ir. Eliud Aganze
Jomokenyatta university of agriculture and technology - B.sc information technology 2014
  

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2.7. 4.4.3.5 Hierarchical network

In a hierarchical design all connecting devices are still on the same level, but these are interconnected at a level above it

Figure 4.4. Hierarchical design

In the traditional Cisco network design model there are three basic levels

1. Access: Where switching is the primary activity.

2. Distribution: Where routing occurs.

3. Core: Which forms a backbone for connecting the distribution level segments of large networks.

Due to significant benefits of hierarchical design over flat design which including

Ø The network is easy to scale

Ø The problem domain can be more easily isolated

Ø It creates logical interconnection points where protocols changes can occur Failure in

Table comparison between hierarchical and flat network design

 

Flat Network

Hierarchical Network

Advantages

Uses for small network and statics

Large and enterprise network

 

Single collision domain

large

 
 

Scalable, manageable

Limitations

Limited number of stations

unlimited

 

Single point of failure

no

 

Broadcast domain layer 3 switches and router

Have 3 layers;

Access. Distribution and core

Table 4.2. Comparisons between hierarchical and flat network design

Note: We have decided to choose this model which will be adequate for our network to make it efficient compare to the current network which use flat network design

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