AWS Certified Advanced Networking Specialty Practice Exam

What can enhance the quality of international voice calls managed by a Session Border Controller in a VPC?

1. Reducing bandwidth usage

2. Enabling enhanced networking on the device

3. Increasing the instance size

4. Using multiple SBCs

The correct answer is: Enabling enhanced networking on the device

Enabling enhanced networking on the device can significantly improve the performance of international voice calls managed by a Session Border Controller (SBC) in a Virtual Private Cloud (VPC). Enhanced networking leverages specific drivers and virtual devices to provide higher packet per second (PPS) performance, lower latency, and reduced CPU utilization compared to traditional network interfaces. This is particularly important in voice communication where latency and jitter can adversely affect call quality. Voice traffic is sensitive to delays and packet loss, making it essential for the infrastructure to handle the required load efficiently. By enabling enhanced networking, the SBC can manage congestion better, optimize throughput, and ultimately provide a clearer and more reliable voice communication experience. In contrast, while actions like reducing bandwidth usage, increasing instance size, or using multiple SBCs might also be beneficial under certain circumstances, their direct impact on the quality of the calls may not be as pronounced or immediate as that of having enhanced networking configurations in place. Enhanced networking specifically targets the immediate needs of reducing latency and increasing throughput, making it the most effective choice for improving call quality.