Designing Cisco Enterprise Networks (ENSLD) — Question 301

A company uses cloud-based applications for voice and video calls, file sharing, content sharing, and messaging. During business hours, these applications randomly become slow and unresponsive. However, other applications work smoothly with the current applied QoS polices. Which solution must the company choose to resolve the issue?

Answer options

• A. Identify the applications with NBAR2 and allocate the required bandwidth accordingly.
• B. Identify the port used by each application and apply a minimum bandwidth guarantee.
• C. Identify the applications and reserve the required bandwidth on the perimeter routers.
• D. Identify the application ports, create groupings, and rate-limit the required bandwidth.

Correct answer: A

Explanation

The correct answer is A because using NBAR2 allows for precise identification of applications and their bandwidth requirements, ensuring that the necessary resources are allocated to improve performance. Options B and D focus on port identification and bandwidth limitations, which may not fully address the root cause of the application's performance issues. Option C, while it involves reserving bandwidth, does not utilize the application's characteristics to optimize bandwidth allocation effectively.