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

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  1. On an Aruba AOS-CX switch, which QoS feature can detect when a queue is persistently congested and alert administrators via SNMP?

    Answer: Queue depth monitoring with SNMP traps

    AOS-CX supports queue depth monitoring that can trigger SNMP traps when configured thresholds are exceeded, alerting administrators to persistent congestion.

  2. Which AF (Assured Forwarding) DSCP class provides the highest drop precedence within that class on an Aruba switch?

    Answer: AF43 (DSCP 38)

    Within each AF class, the third drop precedence level (AFx3) has the highest probability of being dropped during congestion; AF43 (DSCP 38) is class 4, drop precedence 3.

  3. An Aruba switch is configured to use 802.1Q trunking to an IP phone. What VLAN configuration ensures the voice traffic gets QoS treatment separate from data traffic?

    Answer: Configure a voice VLAN (auxiliary VLAN) separate from the data VLAN on the port

    A voice VLAN (auxiliary VLAN) separates phone traffic from PC data traffic, allowing independent QoS policies, DSCP marking, and queue assignment for each.

  4. In the context of Aruba QoS, what does 'remarking' accomplish at the trust boundary for traffic from a PC endpoint?

    Answer: It overrides the PC's self-assigned DSCP markings with switch-defined values

    Remarking at the trust boundary replaces potentially arbitrary DSCP values set by endpoints with network-policy-defined values the administrator controls.

  5. Which AOS-CX command displays the number of packets dropped per queue on an Aruba switch interface, useful for diagnosing QoS issues?

    Answer: show qos statistics interface

    'show qos statistics interface ' provides per-queue packet counters including drops, helping identify which queues are congested.

  6. What is the significance of the 'minimum bandwidth' parameter in an Aruba WRR queue profile?

    Answer: It guarantees the queue will receive at least this percentage of link bandwidth when congested

    The minimum bandwidth parameter in WRR ensures that even under congestion, a queue receives at least its configured bandwidth share before unused capacity is redistributed.

  7. Which Aruba QoS mechanism is most appropriate when an ISP requires traffic to be shaped to a specific rate before sending it across a WAN link to avoid ingress policing drops at the ISP edge?

    Answer: Egress traffic shaping

    Egress traffic shaping smooths traffic to match the ISP's contracted rate using token buckets, preventing drops at the ISP's ingress policer.