You need to ensure voice traffic sent through an ArubaOS-CX switch arrives with minimal latency. What is the best scheduling technology to use for this task?

You need to ensure voice traffic sent through an ArubaOS-CX switch arrives with minimal latency. What is the best scheduling technology to use for this task?

• A. Strict queuing
• B. Rate limiting
• C. Qos shaping
• D. DWRR queuing

Answer: (A)

Voice traffic is extremely sensitive to delay, so you want a scheduling method that always serves high-priority traffic first. Strict queuing (strict priority) does exactly that: as long as there is voice packets in the high-priority queue, the switch processes them before any other traffic, minimizing queuing delay and jitter for voice. Other options don’t guarantee the same low latency. Rate limiting slows overall traffic but doesn’t reduce existing queuing delay for voice. QoS shaping smooths bursts and can add buffering delay, which increases latency for real-time streams. DWRR queuing distributes bandwidth fairly among multiple queues, which can lead to increased latency or jitter for voice when other traffic competes. So the best choice to achieve minimal latency for voice is strict queuing.

Voice traffic is extremely sensitive to delay, so you want a scheduling method that always serves high-priority traffic first. Strict queuing (strict priority) does exactly that: as long as there is voice packets in the high-priority queue, the switch processes them before any other traffic, minimizing queuing delay and jitter for voice.

Other options don’t guarantee the same low latency. Rate limiting slows overall traffic but doesn’t reduce existing queuing delay for voice. QoS shaping smooths bursts and can add buffering delay, which increases latency for real-time streams. DWRR queuing distributes bandwidth fairly among multiple queues, which can lead to increased latency or jitter for voice when other traffic competes. So the best choice to achieve minimal latency for voice is strict queuing.