Development with AWS Services

1. A developer is writing an AWS Lambda function in Node.js and needs to access the name of the Amazon S3 bucket that triggered the invocation. Which argument should the developer inspect to find this information?

• A.The event object, which contains the JSON-formatted payload provided by the invoking service.✓ Correct
• B.The context object, which provides methods and properties with information about the invocation, function, and execution environment.
• C.The environment variables, which inject dynamic configuration values into the function code at runtime.
• D.The process.env global object, which stores all runtime metadata and payload inputs for the function execution.

2. During troubleshooting, a developer needs to log the remaining execution time of a Lambda function before it times out. How can the developer programmatically access this value within the function code?

• A.Invoke the getRemainingTimeInMillis() method provided by the context object passed to the handler.✓ Correct
• B.Inspect the timeoutRemaining property within the event object payload provided by the trigger.
• C.Query the Amazon CloudWatch Logs agent running in the Lambda execution environment for the timeout metric.
• D.Read the AWS_LAMBDA_FUNCTION_TIMEOUT environment variable and subtract the current execution time.

3. A developer notices that a computationally intensive AWS Lambda function is taking too long to process video files. The function does not make any network calls. How can the developer reduce the function's execution time?

• A.Increase the amount of memory allocated to the function, which proportionally increases the available CPU power.✓ Correct
• B.Increase the function's timeout setting so that the underlying infrastructure automatically provisions more CPU.
• C.Configure the function to use a dedicated EC2 instance type with compute-optimized processors (C5).
• D.Enable multithreading in the Lambda runtime settings to distribute the workload across multiple availability zones.

4. An AWS Lambda function is triggered by an Amazon API Gateway request to fetch data from an external API. Intermittently, the function throws an error after exactly 3 seconds, even though the external API takes 5 seconds to respond. What is the most likely cause?

• A.The API Gateway integration timeout is strictly limited to 3 seconds for all synchronous Lambda invocations.
• B.The Lambda function is using the default timeout of 3 seconds and needs to be increased to accommodate the external API.✓ Correct
• C.The external API is rejecting the connection because the Lambda function is exhausting its memory allocation.
• D.The IAM execution role attached to the Lambda function lacks the permissions required to wait for long-running processes.

5. A developer is architecting a system where an Amazon S3 bucket triggers an AWS Lambda function upon object creation. Which invocation model does Amazon S3 use to trigger the Lambda function, and how are retries handled?

• A.It uses the synchronous model, and the developer must implement custom logic to retry failed invocations.
• B.It uses the streaming pull model, and Lambda automatically reads the failed records again until they expire.
• C.It uses the asynchronous push model, and Lambda automatically retries the invocation up to two additional times on failure.✓ Correct
• D.It uses the scheduled model, and Amazon EventBridge retries the function based on the configured exponential backoff.