300-360 Question #68: Real Exam Question with Answer & Explanation

The correct answer is A: Make sure that the access points have the unused rates disabled.. Legacy 802.11 (1/2 Mbps) and 802.11b (5.5/11 Mbps) data rates use DSSS/CCK modulation with different propagation characteristics than 802.11g/n OFDM rates. If these lower rates remain enabled on the AP during calibration, the AP may beacon or respond at those rates, causing the s

Question

If you are calibrating for 2.4 GHz and the site will not be using 802.11 and 802.11b data rates, what should be done to ensure an accurate calibration?

Options

AMake sure that the access points have the unused rates disabled.
BMake sure that you are using an 802.11b client when calibrating.
CMake certain that there are no legacy clients when performing the calibration because they will
DMake sure to use a client that supports both 802.11b/g and 802.11a.

Explanation

Legacy 802.11 (1/2 Mbps) and 802.11b (5.5/11 Mbps) data rates use DSSS/CCK modulation with different propagation characteristics than 802.11g/n OFDM rates. If these lower rates remain enabled on the AP during calibration, the AP may beacon or respond at those rates, causing the survey tool to record signal levels that reflect DSSS behavior rather than the OFDM behavior the live network will actually use. Disabling unused legacy rates on the APs before calibration ensures that the survey accurately represents the RF environment the deployed network will create, producing a calibration map that matches real-world coverage. This is especially important for location/positioning accuracy in systems like Cisco MSE/CMX.

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