However, the most
tangible bene?¬?t of wireless is cost reduction.
?– Both WLANs and LANS use CSMA. However, WLANs use CA, whereas LANs
used CD.
?– Radio frequencies are radiated into the air by antennas where they are affected by:
??” Re?¬‚ection
??” Scattering
??” Absorption
?– The IEEE de?¬?nes the 802.11 standards.
?– The ITU-R local FCC wireless bands are unlicensed.
?– The 802.11 standards are a set of standards that de?¬?ne the frequencies and radio bands
for WLANs.
?– One of the primary bene?¬?ts of the Wi-Fi Alliance is to ensure interoperability among
802.11 products.
Understanding WLAN Security
As discussed previously, the most tangible bene?¬?t of wireless is cost reduction. In addition
to increasing productivity, WLANs increase work quality. However, a security breach
resulting from a single unsecured access point can negate hours spent securing the corporate
network and even ruin an organization. You must understand the security risks of WLANs
and how to reduce those risks.
After completing this section, you will be able to describe WLAN security issues and the
features available to increase WLAN security.
Wireless LAN Security Threats
With the lower costs of IEEE 802.11b/g systems, it is inevitable that hackers have many
more unsecured WLANs from which to choose.
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