Introduction
to
Network Design
Typical Network Design
Business Goals
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Increase revenue and profit
Improve corporate communications
Shorten product-development cycles and increase
employee productivity
Build partnerships with other companies
Expand into worldwide markets
Move to a global network business model
Reduce telecommunications and network costs
Expand the data readily available to all employees
and fields offices
Improve security
Offer better customer support
Offer new customer services
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Top-Down Network
Design Methodology
 Good
network design must recognize a
customer’s requirements.
 Customer’s requirements including :
Availability
 Scalability
 Affordability
 Security
 Manageability
 Service level
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Top-Down Network
Design Methodology
 Top-Down
network design is a methodology
for designing networks that begins at the
upper layers of the OSI reference model
before moving to the lower layers.
 Focuses on applications, sessions and data
transport before the selection of routers,
switches and media.
 Top-Down network design process includes
exploring divisional and group structures.
 Iterative
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Analyzing
Business Goals
 Working
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with a client
Research a client’s business
Learn about client’s market, suppliers, products,
services and competitive advantages
First meeting:
Explain the organizational structure of the company.
 Overall goal of the network design project
 Why is the customer embarking on this new network
design project?
 For what will the new network be used?
 How will the new network help the customer be more
successful in the customer’s business?
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Analyzing
Business Goals
 Changes
in Enterprise Networks
Improve corporate old telecommunications
and data processing
 Improve corporate communications
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Identifying the scope of a
network design project
 Determine
scopes
New network or modification
 Single network segment or remote access
network or whole enterprise network
 Refer to 7-layer of OSI reference model
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Identifying a customer’s
network applications
 Current
& new applications
 Fill in a chart
Name of
application
Type of
application
New
application?
(Yes or No)
Criticality
Comments
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Analyzing business
constraints
 Politics
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and Policies
Escape discussing office politics
technological policies
 Budgetary
and Staffing Constraints
Must fit customer’s budget
 The budget should include allocations for
equipment purchases, software licenses,
maintenance and support agreements,
testing, training, staffing, consulting fees
and outsourcing expenses.
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Analyzing business
constraints
 Scheduling
Timeframe for the network design project
 Tools for developing a schedule includes
milestones, resource assignments, criticalpath analysis, etc.
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Business Goals
Checklist
 Use
a checklist to determine if you have
addressed your client’s business-oriented
objectives and concerns:
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Researched the customer’s industry and
competition
Understand the customer’s corporate structure
Understand the scope of the network design
project
Identified the customer’s network applications
Customer explained policies regarding approved
vendors, protocols or platforms.
The budget for the project
Schedule for the project
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Q&A