Peer-to-Peer (P2P) networking is fast emerging as a disruptive business model displacing the server based networks. P2P technologies are poised to become general-purpose vehicles for building a range of applications for social networking, information delivery and personal communications in addition to the basic file-sharing services. At this evolutionary stage many important questions and problems crop up clamoring for answers and solutions with regard to techniques, scaling, compatibility and application trends. This paper intends to trace the answers to such questions in addition to providing a brief survey of the P2P practices and research directions.

1. Eng Keong Lua, Jon Crowcroft, And Marcelo Pias, Ravi Sharma, Nanyang, Steven Lim, A Survey and Comparison of Peer-To-Peer Overlay Network Schemes, IEEE Communications Surveys & Tutorials • Second Quarter 2005
2. Timo Tanner "Distributed Hash Tables in P2P System – A literature survey", 2005, HUT T-1 10. 551.
3. Bui Minh Nhat, "Searching in P2P Networks: A survey", TKK T-110. 5190 Seminar on Networking, 2009.
4. John F. Buford, Heather Yu, Eng Keong Lua "P2P Networking and Applications", 2009, Morgan Kaufmann Publishers.
5. Karl Aberer, Manfred Hauswirth, "Peer-to-peer information systems: concepts and models, state-of-the-art, and future systems", ICDE 2002.
6. Rudiger Schollmeier, "A Definition of Peer-to-Peer Networking for the Classification of Peer-to-Peer Architectures and Applications", Proceedings of the First International Conference on Peer-to-Peer Computing (P2P. 01), 2002 IEEE
7. Freenet. http://freenetproject. org.
8. Kostas Stefanidis, A survey of peer-to-peer system, [Internet] http://courses. cs. vt. edu/cs5204/fall09-kafura/Papers/FileSystems/P2P-Survey-Kostas. pdf
9. Ion Stoica, Robert Morris, David Karger, M. Frans Kaashoek, Hari Balakrishnan, "Chord: A Scalable Peertopeer Lookup Service for Internet Applications", In Proceedings of SIGCOMM'2001, Aug. 2001.
10. Li, Stribling, Gil, Morris, Kaashoek. "Comparing the performance of distributed hash tables under churn", February 2004
11. K. Gummadi, R. Gummadi, Gribble, Ratnasamy,Shenker, Stoica. The Impact of DHT Routing Geometryon Resilience and Proximity. In Proceedings of ACM SIGCOMM, Aug. 2003.
12. T. Klingberg, R. Manfredi. Gnutella 0. 6. Technical report, June 2002. [nternet] http://rfc-gnutella. sourceforge. net/src/rfc-0_6-draft. html.
13. Jessie Hui Wang. Chungang Wang. Jiahai Yang . Changqing An "A study on key strategies in P2P file sharing systems and ISPs' P2P traffic management", 2011, Springer.
14. Hiroshi Nishida, Thinh Nguyen, "A Global Contribution Approach to Maintain Fairness in P2P Networks", IEEE Transactions on Parallel and Distributed Systems, Vol. 21, No. 6, JUNE 2010.
15. Murat Karakaya, Ibrahim Korpeoglu, and Ozgur Ulusoy "Free Riding in Peer-to-Peer Networks" 2009, IEEE Computer Society.
16. Ma. Y, Richards M, Ghanem M,Guo Y, Hassard J, "Air Pollution Monitoring and Mining Based on Sensor Grid in London", sensors(6):3601,(2008), ISSN 1424-8220; http://www. mdpi. com/1424-8220/8/6/3601

P2p File Sharing Scaling Free Riding Overlays