200-301 Question 382
Single answerA network administrator is configuring Quality of Service (QoS) on a network. They want to ensure that voice traffic is prioritized over other types of traffic and is assigned to a specific queue. Which action should the administrator take to achieve this?
- A
Classify the traffic and mark voice packets with a Differentiated Services Code Point (DSCP) value.
- B
Set up a firewall rule to block all non-voice traffic during peak hours.
- C
Enable Network Address Translation (NAT) for voice traffic.
- D
Configure load balancing for voice traffic across multiple paths.
Show answer and explanation
Correct answer: A
Explanation
To implement QoS, traffic must first be classified and marked. In this scenario, marking voice packets with a DSCP value allows network devices to recognize and prioritize the traffic as it passes through each hop. This aligns with the concept of forwarding per-hop behavior (PHB) for QoS.
- A. Correct.
Classifying and marking traffic with a DSCP value ensures that the relevant traffic is identified and prioritized according to QoS policies. This is a key step in implementing forwarding per-hop behavior (PHB) for QoS.
- B. Incorrect.
Blocking non-voice traffic does not achieve QoS prioritization and is impractical for most network environments, as it disrupts other services.
- C. Incorrect.
NAT is unrelated to QoS and does not provide traffic prioritization or classification.
- D. Incorrect.
Load balancing involves distributing traffic across multiple paths but does not inherently prioritize traffic types like voice.