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…

Question

Options

• AIdentify the applications with NBAR2 and allocate the required bandwidth accordingly.
• BIdentify the port used by each application and apply a minimum bandwidth guarantee.
• CIdentify the applications and reserve the required bandwidth on the perimeter routers.
• DIdentify the application ports, create groupings, and rate-limit the required bandwidth.

• A
  78% (31)
• B
  3% (1)
• C
  8% (3)
• D
  13% (5)

Explanation

Modern cloud-based collaboration applications (such as Webex, Microsoft Teams, or Zoom) use dynamic, non-standard, or encrypted ports that cannot be reliably identified using simple port matching. NBAR2 (Network-Based Application Recognition 2) uses deep packet inspection (DPI) and a regularly updated protocol pack to accurately identify these applications by their traffic signatures - even when ports are ephemeral or TLS-encrypted. Once identified, QoS policies can allocate proper bandwidth (e.g., DSCP marking, priority queuing) for voice, video, and signaling traffic classes. Port-based identification (B) fails for cloud apps using dynamic ports. Reserving bandwidth only on perimeter routers (C) does not address congestion on internal or WAN segments. Rate-limiting (D) would throttle the already-struggling applications, worsening the problem.

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