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NEW QUESTION # 417
A developer is working on an application that processes operating data from IoT devices. Each IoT device uploads a data file once every hour to an Amazon S3 bucket. The developer wants to immediately process each data file when the data file is uploaded to Amazon S3.
The developer will use an AWS Lambda function to process the data files from Amazon S3. The Lambda function is configured with the S3 bucket information where the files are uploaded. The developer wants to configure the Lambda function to immediately invoke after each data file is uploaded.
Which solution will meet these requirements?
Answer: B
Explanation:
Adding a trigger to your Lambda function is the solution that will meet these requirements. A trigger is an event that can invoke a Lambda function. In the case of this issue, the trigger must be an Amazon S3 event that fires when a new file is uploaded to the bucket.
NEW QUESTION # 418
A company has an online order website that uses Amazon DynamoDB to store item inventory. A sample of the inventory object is as follows:
A developer needs to reduce all inventory prices by 100 as long as the resulting price would not be less than 500.
What should the developer do to make this change with the LEAST number of calls to DynamoDB?
Answer: A
Explanation:
To update the Price while ensuring it does not go below 500, the developer should perform a single UpdateItem operation with a ConditionExpression like Price >= 600. This ensures the update is performed only if the price remains ≥ 500 after subtracting 100, minimizing the number of calls by avoiding a prior read.
NEW QUESTION # 419
A company uses AWS Secrets Manager to store API keys for external REST services. The company uses an AWS Lambda function to rotate the API keys on a regular schedule.
Because of an error in the Lambda function, the API keys are updated in Secrets Manager but not in the external REST services. Before investigating the root cause, the company wants to resume requests bound for the external REST services.
Which solution will meet this requirement with the LEAST operational overhead?
Answer: C
Explanation:
Rolling back the secret's staging labels so that the last known-good version is labeled AWSCURRENT immediately restores the previously working API key for your clients. This requires no changes to external systems or additional key-generation logic, minimizing operational overhead.
NEW QUESTION # 420
A developer is working on a Python application that runs on Amazon EC2 instances. The developer wants to enable tracing of application requests to debug performance issues in the code.
Which combination of actions should the developer take to achieve this goal? (Select TWO)
Answer: D,E
Explanation:
Explanation
This solution will meet the requirements by using AWS X-Ray to enable tracing of application requests to debug performance issues in the code. AWS X-Ray is a service that collects data about requests that the applications serve, and provides tools to view, filter, and gain insights into that data. The developer can install the AWS X-Ray daemon on the EC2 instances, which is a software that listens for traffic on UDP port
2000, gathers raw segment data, and relays it to the X-Ray API. The developer can also install and configure the AWS X-Ray SDK for Python in the application, which is a library that enables instrumenting Python code to generate and send trace data to the X-Ray daemon. Option A is not optimal because it will install the Amazon CloudWatch agent on the EC2 instances, which is a software that collects metrics and logs from EC2 instances and on-premises servers, not application performance data. Option C is not optimal because it will configure the application to write JSON-formatted logs to /var/log/cloudwatch, which is not a valid path or destination for CloudWatch logs. Option D is not optimal because it will configure the application to write trace data to /var/log/xray, which is also not a valid path or destination for X-Ray trace data.
References: [AWS X-Ray], [Running the X-Ray Daemon on Amazon EC2]
NEW QUESTION # 421
A developer is troubleshooting an application mat uses Amazon DynamoDB in the uswest-2 Region. The application is deployed to an Amazon EC2 instance. The application requires read-only permissions to a table that is named Cars The EC2 instance has an attached IAM role that contains the following IAM policy.
When the application tries to read from the Cars table, an Access Denied error occurs.
How can the developer resolve this error?
Answer: B
Explanation:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/access-control-overview.html#access- control-resource-ownership
NEW QUESTION # 422
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