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Intruders can use shareware, such as Net Stumbler, combined with a high-gain antenna to scan for the existence of WLANs.

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Table 1: Recommended EAP Types The acronyms used in Table 1 are defined below: Data confidentiality and integrity Enterprises must strive to prevent intentional, unintentional, unauthorized, or inappropriate disclosure of information.

As mentioned in Lesson 1, intruders can eavesdrop using shareware (e.g., Aircrack), and commercial packet capture tools (e.g., Laptop Analyzer from Air Magnet), along with high-gain antennas to discover a WEP key or Rivest Cipher 4 (RC4) keystream (often referred to as a "shared key" attack).

Neither action actually reduces the likelihood that an intruder will discover the WLAN.

We recommend the following best practices: Some high-risk enterprises may want to use directional antennas in order to have greater control over signal propagation compared with omni-directional antennas.

This type of wireless connection can lead to a man-in-the-middle attack.