1. Peer-to-Peer (p2p) Systems
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2. Mainframe
One computer
Many users
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3. Terminals Monitor Keyboard Display information
Allow users to type data
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4. Type of Terminals Dumb Terminals Intelligent Terminals
PC with emulation programs
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5. Intelligent Terminal
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6. bottleneck
Mainframe
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7. Client/Server Server Client Dedicated for one service Validation
Calculation
Format and display information
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8. Client / Server Model
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9. Advantages Reduce workload from central server Easier to upgrade
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10. Peer-to-peer (p2p) A computer can be either client or server.
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11. Napster Model
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12. Anti-cancer Project Oxford University Drug discoveries
Small program in user’s computer
Sub-task send to user’s computer
test molecular structures with proteins
Results send to central computer
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13. Problems of Anti-cancer project
Security
Motivation
Performance
Compatibility
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14. Single client, Multiple server
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15. Wireless system
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16. Wireless system with SMS
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17. Two tiers servers
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18. P2p without central coordinator
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19. Traditional Downloading
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20. BitTorrent (BT) Can handle very big file (such as a movie file)
breaks down a big file into many sub-files
Transmit one sub-file to one peer
A peer is a server and client at the same time
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21. BitTorrent (BT)
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