AWS Certified Advanced Networking - Specialty
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A company faced an IP address exhaustion issue in its VPCs, impacting service capacity. The VPCs contain multiple subnets spread across different Availability Zones. A network engineer must implement a solution to monitor IP address usage across VPC resources and provide notifications for potential issues, enabling proactive action before incidents occur. Which solution meets these requirements with minimal operational overhead?
A company faced an IP address exhaustion issue in its VPCs, impacting service capacity. The VPCs contain multiple subnets spread across different Availability Zones. A network engineer must implement a solution to monitor IP address usage across VPC resources and provide notifications for potential issues, enabling proactive action before incidents occur. Which solution meets these requirements with minimal operational overhead?
Explanation:
The question revolves around monitoring IP address usage across resources in VPCs to prevent IP address exhaustion events. The solution must provide notifications before an incident occurs, with the least operational overhead. Option A suggests using Amazon VPC IP Address Manager (IPAM) with auto-import for VPC and subnet pools, combined with a CloudWatch alarm for notifications. This solution leverages AWS managed services to automate the monitoring and notification process, reducing operational overhead. Option B involves setting up a log group for each subnet and using a Lambda function to publish metrics, which introduces more complexity and operational overhead. Option C also involves a custom solution with a Lambda function and CloudWatch metrics, which, while effective, requires more setup and maintenance than a managed service. Option D is similar to A but uses Amazon EventBridge for monitoring, which is also a managed service but might introduce unnecessary complexity for this specific requirement. Therefore, Option A is the most straightforward and least operationally intensive solution.