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Lesson 14 – DESIGNING A NETWORK
Assessing Network needs
Meeting Network needs
OVERVIEW
Considerations
Applications
User requirements
Network services
Security and safety
Growth and capacity planning
ASSESSING NETWORK NEEDS
Storage space
Bandwidth
Network services
Budget
Considerations
Word processor
Spreadsheet
End-user database
Presentation graphics
Personal information manager
Virus-scanning software
Office suites
Applications
Which applications do employees require?
Do they need the entire suite?
What about file creation/sharing?
Applications
Department-specific applications:
Accounting
Distribution and inventory control
Manufacturing/MRP
Information Technology
Electronic commerce
Human Resources
Applications
Department-specific applications:
Payroll and Stock Administration
Publishing
Marketing support
Legal
Line-of-business applications
Applications
User requirements
File and print
Backup and restore
Web browsing
FTP and Telnet
Internet/external e-mail
Internet security
Dial-out to/from LAN via modem pool
Network services
Fax into LAN
Dynamic Host Configuration Protocol (DHCP)
Centralized virus protection
WAN services
Streaming Internet radio/other media
Voice over IP (VoIP)
Network services
Storage and bandwidth requirements for each service.
Other impacts the services will make.
Network services
The company’s need to keep information secure.
The importance of safety/security issues to the company.
Security and safety
Impact of growth on parts of the Network.
Application behavior.
Network operating systems, Network topologies, and
client/server computers.
Growth and capacity planning
Choosing Network type
Choosing Network structure
Choosing servers
MEETING NETWORK NEEDS
Ethernet:
10Base-T
100Base-T
Choosing Network type
Tips:
Consider Ethernet’s CSMA/CD collision handling.
Use “home run” wiring.
Have a Network backbone.
Choosing Network structure
Tips:
Use inexpensive Ethernet switches as hubs
Consider the building.
Run the backbone vertically from floor-to-floor for multi-
floor buildings.
Choosing Network structure
Tips:
Run backbone speed at 10 times the hub/desktop Network
speed.
Keep server and node on the same segment
Connect servers directly to the backbone’s Ethernet
switch.
Choosing Network structure
Tips:
Separate high-bandwidth users.
Monitor the ratio of collision packets to data packets.
Use subnets.
Keep resources close to users.
Choosing Network structure
Choosing servers
More small servers :
Host fewer services more reliably than fewer large servers
hosting many services.
Increase chances of server failure.
Are expensive.
Require more maintenance.
Choosing servers
While using more than one server, consider:
Which services should be redundant on another server.
How you will deal with server failure.
Small number of large servers or large number of small
servers.
Choosing servers
Assessing Network needs:
Applications
User requirements
Network services
Security and safety
SUMMARY
Meeting Network needs:
Choosing Network type
Choosing Network structure
Choosing servers
Summary
