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Wireless Sensor Networks (WSN) are very popular area of interest both in academic studies and industrial applications since they can work individually without additional maintenance and can be deployed in diverse applications. However, the limited source of the nodes cannot guarantee a sufficient level of security and also complicates the design and the implementation of the algorithms/protocols. DoS (Denial of Service) attacks that manipulate vulnerabilities of access protocol by disrupting network communication or arising exceptional cases and cutting network's lifetime are primary threats for wireless sensor networks. S-MAC (Sensor Medium Access Control) and its derivatives (T-MAC [1], D-MAC [2] etc.) which, are the most common medium access protocols designed for WSNs, are vulnerable against such attacks. In this paper, we have implemented the design of the AR-MAC (Attack Resistant MAC) protocol that detects the types of jammers and maintains the appropriate solution for each jammer type. By means of the new MAC protocol designed, the WSNs have been more robust to DoS attacks in MAC layer and the lifetime of the nodes have been extended under such attacks without additional hardware. [ABSTRACT FROM AUTHOR]