ACSP - Aruba Certified Switching Professional Quality of Service (QoS) Questions and Answers

Question 1

An administrator connects an IP phone with a daisy-chained PC to an ArubaOS-CX switch port.
The phone correctly marks its voice traffic with DSCP EF (46).
The goal is to trust the phone's markings while ensuring any unmarked traffic from the PC is handled by a default policy.
Which command should be configured on the switch interface?

Accepted Answer

qos trust dscp

Answer

qos trust cos

Answer

qos trust device-type phone

Answer

no qos trust

Question 2

A network requires that real-time video surveillance traffic is always serviced before any other traffic during periods of congestion, even if it means other applications experience delays. Which queuing mechanism on an ArubaOS-CX switch should be used to meet this requirement?

Accepted Answer

Strict Priority (SP)

Answer

Deficit Weighted Round Robin (DWRR)

Answer

Weighted Fair Queuing (WFQ)

Answer

Egress Queue Shaping

Question 3

A network engineer has created a QoS policy named `VIDEO-PRIORITY` to classify and mark video traffic. Which of the following commands correctly applies this policy to interface 1/1/5 for inbound traffic on an ArubaOS-CX switch?

Accepted Answer

interface 1/1/5 apply policy VIDEO-PRIORITY in type qos

Answer

interface 1/1/5 qos policy VIDEO-PRIORITY in

Answer

apply policy VIDEO-PRIORITY interface 1/1/5 in type qos

Answer

interface 1/1/5 service-policy input VIDEO-PRIORITY

Question 4

A company wants to ensure that all traffic from a public Wi-Fi VLAN is treated as low-priority, regardless of any markings client devices might send. An administrator creates a class matching this VLAN traffic. Within the QoS policy, which action re-marks all matching traffic with the low-priority DSCP value of CS1?

Accepted Answer

dscp cs1

Answer

local-priority 1

Answer

trust dscp

Answer

police rate 10 mbps

Question 5

Which of the following statements accurately describes a primary difference between Class of Service (CoS) and Differentiated Services Code Point (DSCP) for implementing QoS?

Accepted Answer

CoS is a 3-bit value in the 802.1Q tag, while DSCP is a 6-bit value in the IP header.

Answer

CoS is a Layer 3 marking, while DSCP is a Layer 2 marking.

Answer

CoS provides 64 priority levels, while DSCP provides 8.

Answer

CoS is used for routing decisions, while DSCP is used for switching decisions.

Question 6

An administrator needs to enforce a hard limit on the amount of inbound traffic from a specific server on port 1/1/10 to 20 Mbps. Any traffic exceeding this rate must be dropped immediately. A class has been created to match the server's traffic. Which QoS policy action should be used?

Accepted Answer

police rate 20 mbps

Answer

shape average 20m

Answer

min-bandwidth 20 percent

Answer

rate-limit all 20000 kbps