300-360 Question #11: Real Exam Question with Answer & Explanation

The correct answer is A: Use the Cisco wireless phone site survey client utility.. Voice over WLAN has strict quality requirements. (A) Using the Cisco wireless phone site survey client utility ensures the survey is performed with the same device profile (transmit power, receive sensitivity) as the actual VoIP handsets, giving the most representative coverage d

Question

Which three recommendations must be taken into consideration when an engineer is installing a new Voice WLAN? (Choose three.)

Options

AUse the Cisco wireless phone site survey client utility.
BUse a separate Cisco Wireless Lan Controller.
CEnable load balance on voice WLANs.
DMaintain -67dBM as a minimal RSSI.
ESet data for 2.4 GHz and voice for 5 GHz using separate SSIDs.
FEnable lower data rates for 2.4-GHz data WLAN.

Explanation

Voice over WLAN has strict quality requirements. (A) Using the Cisco wireless phone site survey client utility ensures the survey is performed with the same device profile (transmit power, receive sensitivity) as the actual VoIP handsets, giving the most representative coverage data. (D) Maintaining -67 dBm as the minimum RSSI is the Cisco-recommended threshold for voice; anything weaker causes packet loss and jitter that degrades call quality. (E) Separating voice onto 5 GHz and data onto 2.4 GHz via separate SSIDs reduces co-channel interference and ensures voice traffic benefits from the less-congested 5 GHz band. Load balancing (C) is explicitly NOT recommended for voice WLANs because it can force roaming decisions that disrupt active calls. A separate WLC (B) is unnecessary, and lowering data rates (F) is a coverage tool, not a voice-specific requirement.

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