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

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  1. In Aruba AOS-CX, which command verifies the current QoS schedule profile applied to a specific interface?

    Answer: show qos interface

    'show qos interface ' displays the QoS settings, queue statistics, and schedule profile currently active on the specified interface.

  2. What is the default DSCP value assigned to traffic on an Aruba switch port that has no QoS trust or remarking configured?

    Answer: DSCP 0

    Without explicit QoS configuration, traffic is treated as best-effort with DSCP 0 (CS0), placing it in the lowest-priority queue.

  3. Which QoS scheduling combination on Aruba switches provides the highest determinism for real-time traffic while still serving lower-priority queues?

    Answer: One strict-priority queue for real-time traffic with WRR for remaining queues

    Using one strict queue for real-time traffic (voice/video) combined with WRR for other queues ensures low latency for critical traffic while preventing starvation of lower queues.

  4. On an Aruba switch, 'burst size' in a traffic policer configuration refers to what?

    Answer: The maximum number of bytes allowed to exceed the committed rate instantaneously

    Burst size (Bc) defines how many bytes above the committed rate a flow can send instantaneously before packets are dropped or remarked.

  5. Which DSCP per-hop behavior class is designed for network control traffic such as OSPF and BGP on Aruba switches?

    Answer: Class Selector 6 (CS6)

    CS6 (DSCP 48) is conventionally used for network control plane traffic like routing protocols, ensuring it receives high-priority treatment.

  6. An Aruba switch administrator wants to limit a specific application's bandwidth to 10 Mbps and remarked excess traffic rather than drop it. Which policer action should be configured?

    Answer: action exceed remark dscp

    The 'action exceed remark dscp' option allows traffic above the committed rate to be forwarded with a lower DSCP value instead of being dropped.

  7. Which Aruba AOS-CX feature can automatically detect and prioritize Microsoft Teams or Zoom traffic without requiring manual DSCP classification?

    Answer: Application-aware QoS using NBAR

    Application-aware QoS using NBAR (Network Based Application Recognition) can identify application flows by deep packet inspection and apply appropriate QoS policies automatically.