AWS Certified Advanced Networking - Specialty
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A company operates an application on Amazon EC2 instances within a VPC. A network engineer replaces self-managed NAT instances with a NAT gateway. After redirecting traffic from the self-managed NAT instances to the NAT gateway, users report connectivity issues. Upon investigation, the network engineer finds that connections to the application are timing out after about 6 minutes of inactivity. What steps should the network engineer take to address this problem?
A
Check for increases in the IdleTimeoutCount Amazon CloudWatch metric for the NAT gateway. Configure TCP keepalive on the application EC2 instances.
B
Check for increases in the ErrorPortAllocation Amazon CloudWatch metric for the NAT gateway. Configure an HTTP timeout value on the application EC2 instances.
C
Check for increases in the PacketsDropCount Amazon CloudWatch metric for the NAT gateway. Configure an HTTPS timeout value on the application EC2 instances.
D
Check for decreases in the ActiveConnectionCount Amazon CloudWatch metric for the NAT gateway. Configure UDP keepalive on the application EC2 instances.