AWS Certified Advanced Networking Specialty Practice Exam

What are important considerations for Amazon EC2 VPN performance?

1. The VPN instance should support enhanced networking

2. Using only encrypted protocols

3. The VPN instance must be in the same subnet as the resources

4. Maintaining low CPU utilization

The correct answer is: The VPN instance should support enhanced networking

When addressing the performance of an Amazon EC2 VPN, supporting enhanced networking is a significant consideration. Enhanced networking utilizes advanced features such as the Elastic Network Adapter (ENA) and Intel 82599 Virtual Function (VF) interface, which allow for higher throughput and lower latency. These enhancements enable EC2 instances to achieve better networking performance, reducing the overhead caused by traditional virtual networking stacks. For VPN instances, improved networking capabilities can lead to more efficient data transfer, ultimately enhancing the overall performance of the VPN connection. Factors such as lower CPU utilization are certainly important for performance, but they specifically relate to resource management and efficiency rather than the inherent networking capabilities provided by enhanced networking. Similarly, the requirement for the VPN instance to be in the same subnet as the resources does not directly impact performance; rather, it primarily concerns network architecture and accessibility. Using only encrypted protocols is crucial for security purposes, but it does not directly enhance the performance of the VPN connection itself. Thus, the ability to support enhanced networking most directly aligns with improving the performance metrics of an EC2 VPN setup.