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CHAPTER 1: NETWORK DESIGN CONCEPT - Coggle Diagram
CHAPTER 1: NETWORK DESIGN CONCEPT
NETWORK REQUIREMENT
stay up all the time
Should reliably deliver applications and provide reasonable response times
be secure
easy to modify to adapt to network growth and general business changes
troubleshooting should be easy. Finding and fixing a problem should be not too time-consuming
SIMPLY SAID
Ease of management
Fast Recovery
Application Response Time
Fast troubleshooting
GOAL
Scalability
Ensures that network can grow to include new user groups and remote sites and can
support new applications without impacting the level of service delivered to existing users.
Availability
Ensures that the network can delivers consistent, reliable performance, 24 hours a day, 7 days a week
the failure of a single link or piece of equipment should not significantly
impact network performance
Security
Security is a feature that must be designed into the network, not added on after the
network is complete.
Planning the location of security devices, filters, and firewall features is critical
to safeguarding network resources.
Manageability
The available network staff must be able to manage and support the network. A
network that is too complex or difficult to maintain cannot function effectively and efficiently
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
THREE-LAYER HIERARCHICAL NETWORK DESIGN
used to group devices into multiple networks. The networks are organized in a layers
three basic layer which is:
core layer (connects distribution layer devices)
distribution layer (interconnects the smaller local networks (LANs)
access layer (provides connectivity for network hosts and end devices)
ADVANTAGES OF HIERACHICAL 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
THE CISCO ENTERPRISE ARCHITECTURE
Used to further divide the three-layer hierarchical design into modular areas.
Modules represent areas that have different physical or logical connectivity.
3 areas of focus in modular network design:
ENTERPRISE CAMPUS
Contains the network elements required for independent operation within a single campus
or branch location. This is where the building access, building distribution and campus core are located.
SERVER FARM
A component of the enterprise campus, the data centre server farm protects the server resources
and provides redundant, reliable high-speed connectivity.
ENTERPRISE EDGE
This area filters traffic from the external resources and routes it into the enterprise network.
It contains all the elements required for efficient and secure communication between the enterprise campus and
remote locations, remote users and the Internet
METHODOLOGY
1, Identify network requirement
Characterize existing network
Design the network topology and solution
CISCO LIFECYCLE SERVICES
Designed to support evolving networks
A six-phase approach (PPDIOO).
Prepare, Plan, Design, Implement, Operate & Optimise - 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.
APPROACHES FOR NETWORK DESIGN
Top- Down
Bottom-Up
