Please enable JavaScript.
Coggle requires JavaScript to display documents.
Chapter 1 DFN50133 - Coggle Diagram
Chapter 1 DFN50133
Architecture Of Flat Network Design
A flat network topology, is adequate for small networks and is implemented using Layer 2 switching.
This is no hierarchy with a flat network design, and because each network device within the topology
is performing the same job, a flat network design can be easy to implement and manage.
The flat network topology is not divided into layers or modules and can make troubleshooting and
isolating of network faults a bit more challenging than in a hierarchical network.
In a small network, this might not necessarily be an issue, as long as the network stays small and
manageable.
Advantages of hierarchical network design
vs. flat network design
Hierarchical networks have advantages over flat network designs.
The benefit of dividing a flat network into smaller, more manageable hierarchical blocks is that local
traffic remains local.
Only traffic destined for other networks is moved to a higher layer
Layer 2 devices in a flat network provide little opportunity to control broadcasts or to filter
undesirable traffic. As more devices and applications are added to a flat network, response times degrade until the network becomes unusable.
Cisco Lifecycle Services
Designed to support evolving networks
A six-phase approach (PPDIOO)
Each phase includes the activities required to successfully deploy and operate Cisco technologies.
It specifies how to maximise performance throughout the lifecycle of a network
SIX phases – Prepare, Plan, Design, Implement, Operate & Optimise
Network Design Goal
Scalability
Availability
Security
Manageability
Three areas of focus in modular network design
Enterprise campus
Server farm
Enterprise edge
Three-layer hierarchical network design
Core layer
Distribution layer
Access layer
Methodology
Step 1 : Identify the network requirements
Step 2 : Characterize the existing network
Step 3 : Design the network topology and solutions
Network Requirements
Most businesses have a few requirements for their network
Should be easy to modify to adapt to network growth and general business changes
Troubleshooting should be easy. Finding and fixing a problem should not be too time-consuming
Stay up all the time
Should reliably deliver applications and provide reasonable response times
Should be secure
Simply said
Ease of management
Fast Recovery
Application Response Time
Fast troubleshooting
There are two common approaches for network design
Top-down
Bottom-up
