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Wireless Networking

Wireless Networking

Wireless networks have impacted our existing network environments profoundly over the last few years. Because this is the newest topic on the CCENT and CCNA exams, much of what you need to know is the foundations of wireless:

  • Wireless networks exist by using FCC unmanaged/unregulated radio frequency (RF) signals. This allows corporations to implement wireless technology without FCC approval.

  • The primary technologies that exist today are 802.11b, 802.11g, and 802.11a. 802.11b/g uses the 2.4GHz frequency range. 802.11a uses the 5GHz frequency range. The 2.4GHz band is much more saturated with consumer electronics (such as cordless phones and microwaves) than the 5GHz band. 802.11n is still in draft status at the time of this writing.

  • Higher radio frequencies can handle more bandwidth, but they have less range than the lower radio frequencies.

  • When wireless technology is implemented in a larger building, adjacent wireless access points should use different channels to avoid interfering with each other.

  • The primary channels used in the U.S. for 802.11b/g are channels 1, 6, and 11. These three channels do not have any overlapping frequencies with each other.

  • The Wi-Fi Alliance was an organization whose aim was to create a cross-vendor certification of wireless equipment. Purchasing equipment certified by the Wi-Fi Alliance ensures that all the wireless networking gear you use will be compatible with each other.


  

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