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Amazon AWS Certified Developer - Associate Sample Questions (Q503-Q508):

NEW QUESTION # 503
A web application that runs on a fleet of Amazon EC2 instances sends logs to a log group in Amazon CloudWatch Logs. The logs are in the following format: [ip, id, user, timestamp, request, status_code, size].
A developer needs to create a metric filter that will identify all log events that have a status_code value that indicates a server-side error.
Which solution will meet this requirement?

Answer: B

Explanation:
Server-side errors correspond to HTTP status codes starting with 5 (e.g., 500, 502). Creating a metric filter on the log group using the pattern [ip, id, user, timestamp, request, status_code=5*, size] will capture all such error events across all log streams.


NEW QUESTION # 504
A company is building a micro services app1 cation that consists of many AWS Lambda functions. The development team wants to use AWS Serverless Application Model (AWS SAM) templates to automatically test the Lambda functions. The development team plans to test a small percentage of traffic that is directed to new updates before the team commits to a full deployment of the application.
Which combination of steps will meet these requirements in the MOST operationally efficient way? (Select TWO.)

Answer: B,E

Explanation:
This solution will meet the requirements by using AWS Serverless Application Model (AWS SAM) templates and gradual deployments to automatically test the Lambda functions. AWS SAM templates are configuration files that define serverless applications and resources such as Lambda functions. Gradual deployments are a feature of AWS SAM that enable deploying new versions of Lambda functions incrementally, shifting traffic gradually, and performing validation tests during deployment. The developer can enable gradual deployments through AWS SAM templates by adding a DeploymentPreference property to each Lambda function resource in the template. The developer can set the deployment preference type to Canary10Percent30Minutes, which means that 10 percent of traffic will be shifted to the new version of the Lambda function for 30 minutes before shifting 100 percent of traffic. The developer can also use hooks to test the deployment, which are custom Lambda functions that run before or after traffic shifting and perform validation tests or rollback actions.


NEW QUESTION # 505
A company is developing an application that will be accessed through the Amazon API Gateway REST API. Registered users should be the only ones who can access certain resources of this API. The token being used should expire automatically and needs to be refreshed periodically.
How can a developer meet these requirements?

Answer: B


NEW QUESTION # 506
A company has an application that runs across multiple AWS Regions. The application is experiencing performance issues at irregular intervals. A developer must use AWS X-Ray to implement distributed tracing for the application to troubleshoot the root cause of the performance issues.
What should the developer do to meet this requirement?

Answer: C

Explanation:
Distributed Tracing with X-Ray: X-Ray helps visualize request paths and identify bottlenecks in applications distributed across Regions.
Region Annotations (Automatic for AWS Services): X-Ray automatically adds a Region annotation to segments representing calls to AWS services. This aids in tracing cross-Region traffic.
Region Annotations (Manual for User-Defined): For segments representing calls to user-defined services in different Regions, the developer needs to add the Region annotation manually to enable comprehensive tracing.
Reference:
AWS X-Ray: https://aws.amazon.com/xray/


NEW QUESTION # 507
A developer created reusable code that several AWS Lambda functions need to use. The developer bundled the code into a .zip archive. The developer needs to deploy the code to AWS and update the Lambda functions to use the code.
Which solution will meet this requirement in the MOST operationally efficient way?

Answer: A

Explanation:
A Lambda layer is the correct operationally efficient solution because layers are specifically designed to package reusable code, libraries, custom runtimes, or configuration files separately from function code. The developer can publish the shared .zip archive as a layer version and attach that layer to multiple Lambda functions. This avoids copying the same dependency into every deployment package and centralizes dependency management. Amazon S3 alone does not create an importable runtime dependency path for Lambda. A separate Lambda function would add synchronous invocation latency and coupling. A container image could work for container-based functions, but it is heavier and unnecessary when the code is already packaged as a .zip dependency. AWS documentation states that layers are used to separate reusable dependencies from function code and add them to functions. ( AWS Documentation )


NEW QUESTION # 508
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