P2P network have dramatically gain popularity for the past few years. However, these networks suffer from problem like free-riding, Tragedy of Common which degrades the performance of the network. Here, the authors present several approaches to overcome the problem of free-riding. They have categorized the approaches and have described each category’s important features ...

An ad-hoc network is a collection of mobile nodes, which communicate over radio. These networks have an important advantage; they do not require any existing infrastructure or central administration. Therefore, mobile ad-hoc networks are suitable for temporary communication links. This flexibility, however, comes at a price: communication is difficult to organize due to frequent topology...