Resource consumption is the biggest issue while working with wireless networks. Especially when the authors are in public networks and need to share their infrastructure with others unauthorized and unidentified network components. The problem occurs from connection establishment to communication with these networks. The rate of resource consumption may degrade the performance of existing infrastructure and aligned infrastructure when vulnerabilities comes into effect. This paper has a brief review and proposed a novel concept of resource consumption Index of DOS attacks, causes, vulnerabilities and their countermeasures in mobile ad-hoc networks.