Pure P2P architecture r no always-on server r arbitrary end systems directly communicate r I peers are intermittently connected and change IP addresses r example:Gnutella Highly scalable but difficult to manage 2:Application Layer 92: Application Layer 9 Pure P2P architecture r no always-on server r arbitrary end systems directly communicate r peers are intermittently connected and change IP addresses r example: Gnutella Highly scalable but difficult to manage