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

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5.1.3.2  Location
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5.1.3.4  Fire Suppression
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5.1.3.3  Shielding

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.

Metal Shielding

Paint with metal and Mylar window covering can attenuate the RF signals from wireless and other networks, decreasing the chance someone can get to your network.


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.


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420. http://www.hyperlinktech.com/web/hg2415p.html

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5.1.3.2  Location
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5.1.3.4  Fire Suppression
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