Peer-to-Peer (p2p) Systems

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Presentation transcript:

Peer-to-Peer (p2p) Systems 11/28/2018

Mainframe One computer Many users 11/28/2018

Terminals Monitor Keyboard Display information Allow users to type data 11/28/2018

Type of Terminals Dumb Terminals Intelligent Terminals PC with emulation programs 11/28/2018

Intelligent Terminal 11/28/2018

bottleneck Mainframe 11/28/2018

Client/Server Server Client Dedicated for one service Validation Calculation Format and display information 11/28/2018

Client / Server Model 11/28/2018

Advantages Reduce workload from central server Easier to upgrade 11/28/2018

Peer-to-peer (p2p) A computer can be either client or server. 11/28/2018

Napster Model 11/28/2018

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 11/28/2018

Problems of Anti-cancer project Security Motivation Performance Compatibility 11/28/2018

Single client, Multiple server 11/28/2018

Wireless system 11/28/2018

Wireless system with SMS 11/28/2018

Two tiers servers 11/28/2018

P2p without central coordinator 11/28/2018

Traditional Downloading 11/28/2018

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 11/28/2018

BitTorrent (BT) 11/28/2018