Page 796 - (ISC)² CISSP Certified Information Systems Security Professional Official Study Guide

Authentication Code Protocol) was created to replace WEP and
TKIP/WPA. CCMP uses AES (Advanced Encryption Standard) with a

128-bit key. CCMP is the preferred standard security protocol of
802.11 wireless networking indicated by 802.11i. To date, no attacks
have yet been successful against the AES/CCMP encryption.

Determining Antenna Placement

Antenna placement should be a concern when deploying a wireless

network. Do not fixate on a specific location before a proper site
survey has been performed. Place the wireless access point and/or its
antenna in a likely position; then test various locations for signal
strength and connection quality. Only after confirming that a potential
antenna placement provides satisfactory connectivity should it be
made permanent.

Consider the following guidelines when seeking optimal antenna

placement:

Use a central location.

Avoid solid physical obstructions.

Avoid reflective or other flat metal surfaces.

Avoid electrical equipment.

If a base station has external omnidirectional antennas, typically they
should be positioned pointing straight up vertically. If a directional
antenna is used, point the focus toward the area of desired use. Keep

in mind that wireless signals are affected by interference, distance, and
obstructions. When designing a secure wireless network engineers
may select directional antennas to avoid broadcasting in areas where
they do not wish to provide signal or to specifically cover an area with
a stronger signal.

Antenna Types

A wide variety of antenna types can be used for wireless clients and
base stations. Many devices can have their standard antennas replaced
with stronger (i.e., signal-boosting) antennas.