300-420 Question 242
Single answerA company is deploying a new enterprise voice and video solution across their WAN. They need to ensure that voice traffic is prioritized to minimize latency and jitter while also allowing critical business applications to function properly. Which QoS strategy is most appropriate to meet the company's requirements?
- A
DiffServ with classification and prioritization of traffic using DSCP markings
- B
IntServ with RSVP for reserving bandwidth for all enterprise traffic
- C
DiffServ with bandwidth reservation for each individual application
- D
IntServ with end-to-end guarantees for voice and video traffic only
Show answer and explanation
Correct answer: A
Explanation
The DiffServ QoS strategy is most appropriate in this scenario because it provides a scalable way to classify and prioritize traffic using DSCP markings. This ensures that latency-sensitive traffic, such as voice, is prioritized while allowing critical business applications to function properly. IntServ, while capable of providing end-to-end guarantees, is not suitable for scalable enterprise deployments due to its complexity and resource requirements.
- A. Correct.
DiffServ is the most scalable strategy for enterprise networks. It uses DSCP markings to classify and prioritize traffic, ensuring low latency and jitter for voice while allowing other traffic to coexist efficiently.
- B. Incorrect.
IntServ with RSVP is not ideal for enterprise WANs due to its lack of scalability. Reserving bandwidth for all enterprise traffic would require significant overhead and is not practical for large-scale deployments.
- C. Incorrect.
DiffServ does not use per-application bandwidth reservation. Instead, it focuses on traffic classification and prioritization using classes of service, making this option incorrect.
- D. Incorrect.
While IntServ can provide end-to-end guarantees, it is not scalable in enterprise WAN environments and would require significant configuration overhead for each flow, making it unsuitable for this scenario.