300-420 Question 240
Single answerA financial institution is deploying a new application that requires guaranteed bandwidth and low latency for transaction processing between its data center and branch offices. The IT team wants to ensure that network resources are strictly reserved for this application while allowing other traffic to use any remaining bandwidth dynamically. Which QoS strategy should be implemented to meet these requirements?
- A
Differentiated Services (DiffServ) with Class-Based Weighted Fair Queuing (CBWFQ)
- B
Integrated Services (IntServ) with RSVP
- C
Priority Queuing (PQ) with DSCP markings
- D
Best-Effort service model
Show answer and explanation
Correct answer: B
Explanation
The correct answer is Integrated Services (IntServ) with RSVP because it allows for end-to-end resource reservation and guarantees bandwidth and low latency for specific applications. This is critical for the financial institution's transaction processing needs. Other options either lack strict resource reservation or are not designed to meet such stringent QoS requirements.
- A. Incorrect.
DiffServ with CBWFQ provides prioritization and bandwidth guarantees for traffic classes, but it does not strictly reserve bandwidth for specific flows, which is required in this scenario.
- B. Correct.
IntServ with RSVP is designed to provide end-to-end resource reservation, guaranteeing bandwidth and low latency for specific applications, making it suitable for the financial institution's requirements.
- C. Incorrect.
Priority Queuing (PQ) with DSCP markings can prioritize specific traffic, but it does not guarantee resource reservation or dynamic bandwidth allocation for other flows.
- D. Incorrect.
The Best-Effort service model does not provide any guarantees for bandwidth or latency, making it unsuitable for applications requiring strict QoS.