Peer-to-peer systems are the networks consisting of a group of nodes possible to be as wide as the Internet. These networks are required of evaluation mechanisms and distributed control and configurations, so each peer (node) will be able to communicate with other peers. P2P networks actually act as the specific transportation systems created to provide some services such as searching, large-scale storage, context sharing, and super visioning. Changes in configuration, possibly the resultant effects of faults and failures or of the natural nodes behavior, are one of the most important features in P2P networks. Resilience to faults and failures, and also an appropriate dealing with threats and attacks, are the main requirements of today's most communication systems and networks.