1. Network Configurations 10/9/07

2. How are networks configured? Centralized Centralized Peer-to-peer Peer-to-peer Client/Server Networks Client/Server Networks

3. Centralized

4. Centralized Costly Costly Very Powerful Very Powerful Not easy to change as network needs to change Not easy to change as network needs to change AKA – terminal network system AKA – terminal network system

5. Peer-to-peer

6. Peer-to-peer Function as both client and servers Function as both client and servers No dedicated server No dedicated server All computers are equal – the peer All computers are equal – the peer Most do not require an administrator Most do not require an administrator

7. Client/Server Network

8. Client/Server Built around one or more dedicated servers Built around one or more dedicated servers Administered from central location Administered from central location More powerful than peer-to-peer More powerful than peer-to-peer Support hundreds or thousands of clients Support hundreds or thousands of clients Most common type of network Most common type of network

9. How do we choose the architecture? Type of user Type of user Size of the organization Size of the organization Administration Administration Security Security Network traffic Network traffic Cost Cost Scalability Scalability

10. Comparison of … Peer-to-peerClient/Server Type of user Homes and small businesses Large corporations, schools, and hospitals Size of organization Limited number of workstations Large number of workstations AdministrationUser Central administrator Security Individual users Network administrator Network traffic Limited number of users Large number of users Cost Inexpensive to implement Usually more expensive than peer- to-peer Scalability Limited growth High growth projected

11. Advantage/Disadvantages

12. Peer-to-peer Advantages Advantages Easy to installEasy to install No dedicated serverNo dedicated server Individual control of user resourcesIndividual control of user resources Low costLow cost Disadvantages Disadvantages Limitation of geographic areaLimitation of geographic area ScalabilityScalability Difficulty in ensuring securityDifficulty in ensuring security Useful in offices of 10 or less computersUseful in offices of 10 or less computers

13. Client/Server Advantages Advantages ScalableScalable Cost lessCost less Support many usersSupport many users More powerfulMore powerful Can centralize securityCan centralize security Can use more resourcesCan use more resources Disadvantages Disadvantages More expensiveMore expensive More complicatedMore complicated Server failures can shut everything downServer failures can shut everything down