200-301 Question 383
Single answerA network engineer is tasked with configuring Quality of Service (QoS) on a router to ensure that voice traffic receives priority treatment over other types of traffic. The engineer decides to classify and mark packets at the ingress interface. What is the primary purpose of packet marking in this scenario?
- A
To assign packets to a specific forwarding behavior in the network
- B
To guarantee bandwidth for marked packets across the entire network
- C
To drop packets that exceed the allocated bandwidth
- D
To increase the transmission speed of marked packets
Show answer and explanation
Correct answer: A
Explanation
Packet marking is a key component of QoS and is used to classify traffic into different categories. Markings, such as Differentiated Services Code Point (DSCP) values, inform downstream devices about how to handle the packets. This ensures that critical traffic, like voice or video, receives appropriate priority treatment as it traverses the network.
- A. Correct.
Packet marking is used to assign packets to specific forwarding behaviors, such as prioritizing voice traffic in this scenario. This allows downstream devices to handle packets based on their markings.
- B. Incorrect.
Marking does not guarantee bandwidth; it provides a way for devices to identify and prioritize traffic according to the configured QoS policies.
- C. Incorrect.
Marking does not drop packets. Dropping packets is a function of traffic policing or congestion management, not marking.
- D. Incorrect.
Marking does not directly increase transmission speed. It only helps prioritize traffic based on QoS policies.