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Network Admission Control (NAC) is one part of Selfdefending Network (SDN) Plan. Because NAC only allows secure network equipment access network, it can improve the security of network. In this paper, the authentication process of NAC was analyzed. The client agent which in the most front of NAC should have the function was studied. The design idea was introduced, functions of all the modules of the client agent was described. At last, the experiment circumstance was built, the experiment was carried out, and the results were all satisfying.

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