RF Spectrum Analysis

We discussed the importance of and rationale for RF spectrum analysis earlier in this chapter. From an auditor's/hacker's point of view, understanding the RF pattern and plot will help you identify if any devices are operating surreptitiously outside normal ranges. For example, a U.S.-based organization operates three APs across Channels 1, 6, and 11, and then all of a sudden, you see a slew of RF energy on Channel 13 or 14. Apart from the fact that this activity is in violation of FCC rules if it is coming from the organization's AP, it could also represent a knowledgeable person operating a rogue AP on a channel that would not be accessible or identifiable by someone operating a WNIC that only has a Channel 1-11-capable radio.

If activity on a particular RF frequency is detected, the auditor needs to ensure that the wireless networking equipment used for auditing purposes is capable of receiving and transmitting at that frequency before heading to the next phase.

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