  Cooperative networking brings performance improvement to most of the issues
in wireless networks, such as fading or delay due to slow stations. However,
due to cooperation when data is relayed via other nodes, there network is more
prone to attacks. Since, channel access is very important for cooperation, most
of the attacks happens at MAC. One of the most critical attack is denial of
service, which is reason of cooperation failure. Therefore, the cooperative
network as well as simple wireless LAN must be defensive against DOS attacks.
In this article we analyzed all possible of DoS attacks that can happen at MAC
layer of WLAN. The cooperative protocols must consider defense against these
attacks. This article also provided survey of available solutions to these
attacks. At the end it described its damages and cost as well as how to handle
these attacks while devising cooperative MAC.
