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1. Network Applications

• Read and write data over network
• Dominant model: bidirectional, reliable byte stream connection
  • One side reads what the other writes
  • Operates in both directions
  • Reliable (unless connection breaks)

Blow we will introduce three examples: the world wide web, BitTorrent and Skype

• the world wide web: A client-server model. A client opens a connection to a server and requests documents. The server responds with the documents.
• BitTorrent: A peer-to-peer model. Swarms of clients open connections to each other to exchange pieces of data, creating a dense network of connections.
• Skype: A mix of the two models. When Skype clients can communicate directly, they do so in a peer-to-peer fashion. But sometimes the clients can’t open connections directly, and so instead go through rendezvous or relay servers.