Preventing 802.11b Data Rates: Configuration Tasks on Cisco WLC
Question
To improve the overall wireless experience of your users, you do not want any clients to use 802.11b data rates to associate to your wireless network.
You do not want 802.11a/g/n data rates to be affected in any way.
Which two configuration tasks on the Cisco WLC will achieve this goal? (Choose two.)
Answers
Explanations
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A. B. C. D. E. F.AC.
To improve the overall wireless experience of your users, you don't want any clients to use 802.11b data rates to associate with your wireless network. However, you don't want 802.11a/g/n data rates to be affected in any way. Two configuration tasks on the Cisco WLC that will achieve this goal are:
A. Disable the 1, 2, 5.5, and 11 Mb/s data rates.
B. Disable all data rates below 12 Mb/s.
Explanation:
A. By disabling the 1, 2, 5.5, and 11 Mb/s data rates, you are effectively disabling the 802.11b data rates. This is because these data rates are only used by 802.11b devices, and disabling them will prevent any 802.11b devices from associating with your wireless network. This configuration will not affect the 802.11a/g/n data rates.
B. Disabling all data rates below 12 Mb/s will also disable the 802.11b data rates, as they all fall below this threshold. This configuration will also affect some of the lower 802.11a/g data rates, such as 6 Mb/s and 9 Mb/s, but it will not affect the higher 802.11a/g/n data rates.
C. Configuring the WLAN radio policies to 802.11a/g only will disable the 802.11b data rates, as well as the 802.11n data rates, which are only available on the 5 GHz band. This configuration will limit the available data rates to only 802.11a and 802.11g, and will not allow any 802.11n devices to associate with the network.
D. Disabling the 802.11b network on the Cisco WLC will prevent any 802.11b devices from associating with the network. However, this configuration will also disable any 802.11b data rates that may be used by 802.11g devices in certain circumstances, such as in areas with poor signal quality.
E. Disabling the 2.4 GHz radio on all APs will prevent any devices from using the 2.4 GHz band, which is where the 802.11b data rates are used. However, this configuration will also prevent any devices from using the 2.4 GHz band for other data rates, such as 802.11g or 802.11n.
F. Disabling the DSSS data rates will disable the 802.11b data rates, as they use DSSS modulation. However, this configuration will also disable some of the lower 802.11g data rates, as they also use DSSS modulation in certain circumstances.
Therefore, options A and B are the correct answers, as they will achieve the goal of disabling the 802.11b data rates while not affecting the 802.11a/g/n data rates.
