What is the primary purpose of CAC in limiting calls?

• A. Provide end-to-end encryption for calls.
• B. Limit calls to protect bandwidth.
• C. Prioritize voicemail traffic exclusively.
• D. Remove all QoS markings.

Answer: (B)

Call Admission Control focuses on keeping real-time voice traffic from overloading the network by admitting new calls only when there is enough available bandwidth. This prevents congestion, preserves call quality for ongoing calls, and ensures the link isn’t saturated. It’s not about encrypting calls, prioritizing voicemail specifically, or removing QoS markings—the key purpose is to limit new calls to protect bandwidth.