350-401 Question #959: Real Exam Question with Answer & Explanation

Question

When voice services are deployed over a wireless environment, which service must be disabled to ensure the quality of calls?

Options

• Apriority queuing
• Bdynamic transmit power control
• Caggressive load balancing
• DFastlane

Explanation

Voice over Wireless – Aggressive Load Balancing

Aggressive Load Balancing (C) must be disabled in wireless voice deployments because it forcibly moves clients to less congested access points mid-session, causing call drops, jitter, and degraded audio quality - a seamless, stable connection is critical for VoIP. Priority Queuing (A) is actually beneficial for voice and should remain enabled, as it ensures voice packets receive preferential treatment over data traffic. Dynamic Transmit Power Control (B) is also generally acceptable in voice environments and helps manage interference, so disabling it is not required for call quality. Fastlane (D) is a Cisco/Apple feature that improves voice and video quality by prioritizing traffic using QoS mechanisms, making it something you want enabled, not disabled.

🧠 Memory Tip: Think of "Aggressive Load Balancing" like a bouncer kicking you out of a club mid-conversation to balance the crowd - great for data, terrible for a phone call. If it's aggressive and moves clients, it breaks voice sessions.

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