Designing Cisco Enterprise Wireless Networks (ENWLSD) — Question 168

A hospital wireless environment was designed with these characteristics:
• RF coverage
• better than -67 dBm in the 5 GHz spectrum
• RRM be used for DCA and TPC in the 2.4 GHz band
• RRM be used for DCA and TPC in the 5 GHz band

After deployment, why do many of the legacy 802.11b/g devices have difficulty maintaining connectivity?

Answer options

• A. Excessive co-channel interference in the 2.4 GHz band exists.
• B. Excessive overlapping channels in the 2.4 GHz band exists.
• C. TPC drastically increases Tx power in the 2.4 GHz band.
• D. TPC drastically reduces Tx power in the 2.4 GHz band.

Correct answer: D

Explanation

The correct answer is D because Transmit Power Control (TPC) is designed to lower the transmission power to reduce interference, which can lead to connectivity issues for legacy devices that expect higher power levels. The other options either misrepresent the effect of TPC or incorrectly describe the interference conditions that do not align with the given characteristics of the wireless environment.