1. Lesson 14 – DESIGNING A NETWORK

2. Assessing Network needs Meeting Network needs OVERVIEW

3. Considerations Applications User requirements Network services Security and safety Growth and capacity planning ASSESSING NETWORK NEEDS

4. Storage space Bandwidth Network services Budget Considerations

5. Word processor Spreadsheet End-user database Presentation graphics E-mail Personal information manager Virus-scanning software Office suites Applications

6. Which applications do employees require? Do they need the entire suite? What about file creation/sharing? Applications

7. Department-specific applications: Accounting Distribution and inventory control Manufacturing/MRP Information Technology Electronic commerce Human Resources Applications

8. Department-specific applications: Payroll and Stock Administration Publishing Marketing support Legal Line-of-business applications Applications

9. User requirements

10. 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

11. Fax into LAN Dynamic Host Configuration Protocol (DHCP) Centralized virus protection WAN services Streaming Internet radio/other media Voice over IP (VoIP) Network services

12. Storage and bandwidth requirements for each service. Other impacts the services will make. Network services

13. The company’s need to keep information secure. The importance of safety/security issues to the company. Security and safety

14. Impact of growth on parts of the Network. Application behavior. Network operating systems, Network topologies, and client/server computers. Growth and capacity planning

15. Choosing Network type Choosing Network structure Choosing servers MEETING NETWORK NEEDS

16. Ethernet: 10Base-T 100Base-T Choosing Network type

17. Tips: Consider Ethernet’s CSMA/CD collision handling. Use “home run” wiring. Have a Network backbone. Choosing Network structure

18. 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

19. 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

20. Tips: Separate high-bandwidth users. Monitor the ratio of collision packets to data packets. Use subnets. Keep resources close to users. Choosing Network structure

21. Choosing servers

22. 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

23. 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

24. Assessing Network needs: Applications User requirements Network services Security and safety SUMMARY

25. Meeting Network needs: Choosing Network type Choosing Network structure Choosing servers Summary