ACA Quality of Service & Traffic Management

Question 1

What is the primary purpose of Quality of Service (QoS) in a network?

Accepted Answer

To prioritize certain types of traffic to ensure performance

Answer

QoS prioritizes certain traffic types (such as voice and video) to guarantee the performance levels they require, rather than increasing raw bandwidth.

Question 2

Which QoS marking method operates at Layer 2 of the OSI model?

Accepted Answer

802.1p CoS

Answer

802.1p CoS (Class of Service) uses a 3-bit field in the 802.1Q VLAN tag to mark traffic at Layer 2.

Question 3

What does DSCP stand for in the context of QoS?

Accepted Answer

Differentiated Services Code Point

Answer

DSCP stands for Differentiated Services Code Point, a 6-bit field in the IP header used to classify and prioritize network traffic.

Question 4

Which queuing mechanism gives absolute priority to delay-sensitive traffic, ensuring it is always dequeued first?

Accepted Answer

Strict Priority Queuing (PQ)

Answer

Strict Priority Queuing always services the highest-priority queue first before any other queue, guaranteeing minimal delay for sensitive traffic like VoIP.

Question 5

What is the valid range of DSCP values that can be assigned to IP packets?

Accepted Answer

0–63

Answer

DSCP uses a 6-bit field in the IP header's ToS byte, giving a range of 0 to 63.

(ACA) Aruba Certified Associate Certification Practice Test

(ACA) Aruba Certified Associate Certification Practice Test

ACA Quality of Service & Traffic Management