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The topic on using reputation has received considerable research attention in the field of networking and communications. In this survey paper, we discuss the various ways the systems can benefit from using reputation information. We provide the examples of existing reputation-based systems discussing their functional implementations. Based on our observations, we list minimum requirements for benefiting from reputation-based systems in computer networks. This survey is suited as a tutorial for both researchers and practitioners, willing to build reputation systems, equipped with the knowledge and experience have been made in the field.