Peer-peer architecture ■no always-on server mobile network arbitrary end systems directly national or global ISP communicate peers request service from other peers,provide service in return to other peers loca regi self scalability -new peers bring new service capacity,as well as new service home twork content demands provider network datacente peers are intermittently connected network and change IP addresses ·complex management enterprise example:P2P file sharing network Application Layer:2-7 mobile network home network enterprise network national or global ISP local or regional ISP datacenter network content provider network Peer-peer architecture ▪ no always-on server ▪ arbitrary end systems directly communicate ▪ peers request service from other peers, provide service in return to other peers • self scalability – new peers bring new service capacity, as well as new service demands ▪ peers are intermittently connected and change IP addresses • complex management ▪ example: P2P file sharing Application Layer: 2-7