AWS Certified SysOps Administrator – Associate (legacy) — Question 859

A serverless application running on AWS Lambda is expected to receive a significant increase in traffic. A SysOps Administrator needs to ensure that the Lambda function is configured to scale so the application can process the increased traffic.
What should the Administrator do to accomplish this?

Answer options

• A. Attach additional elastic network interfaces to the Lambda function
• B. Configure AWS Application Auto Scaling based on the Amazon CloudWatch Lambda metric for the number of invocations
• C. Ensure the concurrency limit for the Lambda function is higher than the expected simultaneous function executions
• D. Increase the memory available to the Lambda function

Correct answer: C

Explanation

AWS Lambda scales automatically in response to incoming requests by running concurrent instances. To prevent throttling during traffic spikes, the administrator must ensure that the function's concurrency limit is configured to be higher than the expected number of simultaneous executions. Adjusting memory affects performance but not scaling limits, and Application Auto Scaling is not used to scale Lambda concurrency in this manner.