300-420 Question 241
Single answerA global enterprise requires a Quality of Service (QoS) strategy for their network to support video conferencing, voice traffic, and bulk data transfers across multiple branch offices. They want to ensure guaranteed bandwidth for voice and video while allowing best-effort delivery for bulk data transfers. Which QoS strategy should they implement to meet these requirements?
- A
DiffServ with traffic classification and prioritization
- B
IntServ with RSVP (Resource Reservation Protocol)
- C
Best-Effort without any QoS policies
- D
Bandwidth reservation using MPLS TE (Traffic Engineering)
Show answer and explanation
Correct answer: A
Explanation
DiffServ is the appropriate QoS strategy for this scenario as it allows traffic to be classified into different service levels (e.g., Expedited Forwarding for voice and video, and Best-Effort for bulk data). It is scalable and efficient for large enterprises with diverse traffic needs. IntServ, while capable of reserving bandwidth, is better suited for smaller networks due to its scalability limitations. Best-Effort and MPLS TE do not meet the specific QoS requirements in this case.
- A. Correct.
DiffServ is designed to classify and prioritize traffic based on predefined policies, making it suitable for ensuring guaranteed bandwidth for voice and video while allowing best-effort delivery for bulk data transfers.
- B. Incorrect.
IntServ with RSVP provides per-flow resource reservation, which can be effective for guaranteeing bandwidth but is not scalable for large global enterprises due to its overhead and complexity.
- C. Incorrect.
Best-Effort does not offer any QoS guarantees, making it unsuitable for ensuring prioritized delivery of voice and video traffic.
- D. Incorrect.
MPLS TE is a transport technology used for optimizing bandwidth utilization and routing but does not inherently provide the traffic classification and prioritization needed for this scenario.