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WAN( Wide Area Network)

Design a CSR network for a telecom service provides having aDC at Hyderabad and covering MP. The network should reach

to important cities and up to all district places in the state.

Design a detailed network for Bhopal considering 10 customer

services centres in the city.

DESIGN OBJECTIVE

Is a computer network that covers geographically disperseareas i.e. a WAN network can be setup between-Two citiesBetween countries

Across continents

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TYPES OF WAN SERVICES

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Technology Typical Uses

Leased Line PPP networks, hub and spoke, back-ups

ISDN Remote-access to corporate networks,voice, video, back-ups

Frame Relay Fast, efficient mesh between remote sites

WAN TECHNOLOGIES

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WAN DESIGN REQUIREMENT

WAN communication is often called a service because thenetwork provider often charges users for the WAN servicesit provides.

All technologies and features used in WANs are developed

to meet the following design requirements:Optimize WAN bandwidth.Minimize cost.Maximize the effective service to the end users.

New WAN infrastructures must be:more complex.based on new technologies.able to handle an ever-increasing (and rapidly changing)application mix with required and guaranteed service levels.

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LAN/WAN, previously logically separated, must now be fullyintegrated for seamless performanceBoth now must be able to handle...

Voice traffic (VoIP)

Bandwidth intensive multimedia applications

Video conferencing

On-line training

Increased business critical data access

LAN/WAN INTEGRATION

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WAN DESIGN STRATEGIES

Mesh Network is flat

All routers perform same function

Expansion proceeds haphazardly

Hierarchical

Organized in layers

Easier to implement/Troubleshooting Scalability Predictability

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BENEFIT OF HIERARCHICAL DESIGN

Scalability allows for future growth without sacrificing control or

functionality

Ease of Implementation

logically constructed layers specify the functions of each layer Ease of troubleshooting

well-defined functions at each layer aid in the isolation ofproblems

Predictability behavior of functional layers can be estimated and planned for

Protocol support allows easier implementation of future technologies because

the network has been logically constructed

Manageability All the above aids in overall management of the network