Why is it recommended for a wireless network administrator to disable 1 Mbps and 2 Mbps data rates on the WLAN infrastructure? (Choose 2)
A. To improve capacity in the BSS
B. To reduce the size of the AP’s effective service area
C. To prevent 802.11b devices from associating
D. To maximize the range of the highest data rates
E. To prevent VoWiFi multicast frames
F. To enable support for long preambles
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B —>> wrong,
C —>> correct
In 2.4GHz, your first goal is to get rid of non-WiFi interference sources. Your second goal is to get rid of 11b client devices. Use of 11b clients necessitates use of low (non-OFDM) data rates, which forces the use and ripple of protection mechanisms (e.g. RTS/CTS and CTS-to-Self). See this white paper.
Using 12M as your minimum basic rate (MBR) will disconnect all 11b devices and will prevent protection ripple, both of which will add capacity to your network through increased airtime capacity.