ACSP Quality of Service (QoS) 4

Question 1

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

Accepted Answer

show qos interface <port>

Answer

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

Question 2

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

Accepted Answer

DSCP 0

Answer

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

Question 3

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

Accepted Answer

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

Answer

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.

Question 4

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

Accepted Answer

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

Answer

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

Question 5

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

Accepted Answer

Class Selector 6 (CS6)

Answer

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

(ACSP) Aruba Certified Switching Professional Practice Test

(ACSP) Aruba Certified Switching Professional Practice Test

ACSP Quality of Service (QoS) 4