threat defense

Give me a leadership task, that is to let me do a threat defense, when I heard these words, I really do not know how to say, because I’ve never done a thing, and the most important is I never contacted threat defense, how can I what do the threat defense assessment, I is really very difficult, but I have to pay the task of leadership is not what to do, then I think, since I do not understand the threat defense knowledge that I should learn ah, but in this case, threat defense evaluation it can also be better, so I intend to learn some knowledge of threat defense, threat defense to do the evaluation, I think this is good for some.