Practice Test Geeks(ACSP) Aruba Certified Switching Professional Practice Test
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Quality of Service (QoS) Flashcards

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  1. Which QoS mechanism on Aruba switches uses token bucket algorithms to control the rate of traffic egressing a port?

    Answer: Traffic shaping

    Traffic shaping uses token bucket algorithms to buffer and pace traffic, smoothing bursts to conform to a configured rate.

  2. On an Aruba switch, which DSCP value is associated with the Expedited Forwarding (EF) per-hop behavior used for voice traffic?

    Answer: DSCP 46

    DSCP 46 (101110 binary) is defined as Expedited Forwarding (EF) and is the standard marking for voice traffic requiring low latency.

  3. Which Aruba AOS-CX command applies a QoS schedule profile to an interface?

    Answer: apply qos schedule-profile

    The command 'apply qos schedule-profile ' under an interface context attaches a schedule profile to control queue servicing on that port.

  4. What is the primary purpose of the 'qos trust' command on an Aruba access port?

    Answer: Instructs the switch to honor incoming DSCP or CoS markings

    'qos trust dscp' or 'qos trust cos' tells the switch to use the packet's existing markings rather than overriding them with a default value.

  5. In Aruba's QoS queuing model, which scheduling algorithm gives each queue a guaranteed minimum bandwidth while allowing unused bandwidth to be shared?

    Answer: Weighted Round Robin (WRR)

    WRR assigns weights to queues, guaranteeing minimum bandwidth proportional to each weight while redistributing unused capacity to other queues.

  6. Which CoS value is typically recommended by Aruba for marking IP telephony voice bearer traffic on a trunk port?

    Answer: CoS 5

    CoS 5 is the IEEE 802.1p standard recommendation for voice bearer (RTP) traffic, mapping to the highest-priority queues.

  7. An Aruba switch is dropping voice packets during congestion. Which congestion avoidance mechanism would help by proactively dropping lower-priority TCP traffic before queues fill?

    Answer: Weighted Random Early Detection (WRED)

    WRED selectively drops lower-priority packets earlier in the congestion cycle, allowing TCP flows to back off before queues reach full capacity.