300-420 Question 243
Single answerA large financial organization is deploying a new video conferencing system across its global offices. The IT team is tasked with ensuring a high-quality video experience without negatively impacting critical financial transaction traffic. Which QoS strategy should be selected to meet these requirements?
- A
DiffServ, with video traffic marked as EF (Expedited Forwarding) and financial transactions as AF (Assured Forwarding)
- B
IntServ, reserving bandwidth dynamically for video and financial transaction traffic using RSVP
- C
DiffServ, with all traffic treated equally to ensure fairness across applications
- D
IntServ, using a static configuration to prioritize video traffic over financial transactions
Show answer and explanation
Correct answer: A
Explanation
DiffServ is the most appropriate strategy for this scenario as it provides a scalable and efficient way to prioritize traffic based on the organization's requirements. Marking video traffic as EF ensures low latency and jitter, while marking financial transactions as AF ensures reliable delivery without compromising network scalability. IntServ, while offering strict QoS guarantees, is less suitable for global, large-scale deployments due to its complexity and overhead.
- A. Correct.
DiffServ, with marking video traffic as EF and financial transactions as AF, allows prioritization of video while ensuring financial transactions maintain their reliability. This approach scales well for global deployments.
- B. Incorrect.
IntServ with RSVP can provide strict QoS guarantees but is not scalable for a global deployment due to its per-flow reservation overhead.
- C. Incorrect.
Treating all traffic equally does not prioritize critical applications like video conferencing and financial transactions, leading to potential quality degradation.
- D. Incorrect.
Using IntServ with a static configuration does not offer the flexibility required to handle dynamic traffic patterns in a large-scale environment.