ACSP Quality of Service (QoS) 5

Question 1

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

Accepted Answer

Queue depth monitoring with SNMP traps

Answer

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

Question 2

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

Accepted Answer

AF43 (DSCP 38)

Answer

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.

Question 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?

Accepted Answer

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

Answer

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

Question 4

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

Accepted Answer

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

Answer

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

Question 5

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

Accepted Answer

show qos statistics interface <port>

Answer

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

(ACSP) Aruba Certified Switching Professional Practice Test

(ACSP) Aruba Certified Switching Professional Practice Test

ACSP Quality of Service (QoS) 5