You are concerned about rogue wireless access points being connected to your network.

Routinely doing site surveys (or better still, having them automatically conducted frequently) is the only way to know what is connected to your network. And it will reveal any rogue access points. Answer: B is incorrect. While anti virus software is always a good idea, it will do nothing to prevent rogue access points. Answer: A is incorrect. While anti-spyware software is always a good idea, it will do nothing to prevent rogue access points. Answer: C is incorrect. A protocol analyzer will help you analyze the specific traffic on a given node, but won't be much help in directly detecting rogue access points.