CertiGuide to Security+  9  Chapter 5:  Operational/Organizational Security (Domain 5.0; 15%)       9  5.1  Physical Security            9  5.1.3  Environment

5.1.3.2  Location 1 5.1.3.4  Fire Suppression

Shielding reduces the distance that radio and other electronic waves can travel. For example, the building in which the network is operating can be used as a shield for itself.

The downside could be a negative impact on pagers and cellular phones. An additional plus is this reduces your risk of a wireless denial of service attack. Keep in mind that 802.11b operates at the same frequency of a microwave oven. Something as simple as disabling the safety interlock of a consumer microwave oven creates a DoS weapon with up to 1000 watts of 802.11b interference. A more determined black hat may invest in a ‘heavy duty’ antenna, capable of handling up to a 300W⁴²⁰ input from the inner workings of a microwave antenna.

5.1.3.2  Location 1 5.1.3.4  Fire Suppression