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最新AWS-Certified-Developer-Associate題庫 - AWS-Certified-Developer-Associate考試資料

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要準備 AWS-Developer 認證考試，候選人必須對 AWS 服務和架構有很強的了解。他們還應該具備使用 AWS 服務開發和部署基於雲的應用程序的經驗。有許多資源可供候選人準備考試，包括 AWS 文檔、白皮書和在線培訓課程。

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最新的 AWS Certified Developer AWS-Certified-Developer-Associate 免費考試真題 (Q245-Q250):

問題 #245
The Developer for a retail company must integrate a fraud detection solution into the order processing solution. The fraud detection solution takes between ten and thirty minutes to verify an order. At peak, the web site can receive one hundred orders per minute.
What is the most scalable method to add the fraud detection solution to the order processing pipeline?

A. Add all new orders to an SQS queue. Configure an Auto Scaling group that uses the queue depth metric as its unit of scale to launch a dynamically-sized fleet of EC2 instances spanning multiple AZs with the fraud detection solution installed on them to pull orders from this queue. Update the order with a pass or fails status.
B. Add all new orders to an Amazon Kinesis Stream. Subscribe a Lambda function to automatically read batches of records from the Kinesis Stream. The Lambda function includes the fraud detection software and will update the order with a pass or fail status.
C. Add all new orders to an Amazon SQS queue. Configure a fleet of 10 EC2 instances spanning multiple AZs with the fraud detection solution installed on them to pull orders from this queue. Update the order with a pass or fails status.
D. Write all new orders to Amazon DynamoDB. Configure DynamoDB Streams to include all new orders.Subscribe a Lambda function to automatically read batches of records from the Kinesis Stream. The Lambda function includes the fraud detection software and will update the order with a pass or fail status.

答案：A

問題 #246
A nightly batch job loads 1 million new records into a DynamoDB table. The records are only needed for one hour, and the table needs to be empty by the next night's batch job.
Which is the MOST efficient and cost-effective method to provide an empty table?

A. Create and then delete the table after the task has completed.
B. Use DeleteItem using a ConditionExpression.
C. With a recursive function that scans and calls out DeleteItem.
D. Use BatchWriteItem to empty all of the rows.

答案：A

問題 #247
A company maintains an application responsible for processing several thousand external callbacks each day.
The company's System administrators want to know how many callbacks are being received on a rolling basis, and they want this data available for 10 days. The company also wants the ability to issue automated alerts if the number of callbacks exceeds the defined thresholds.
What is the MOST cost-effective way to address the need to track and alert on these statistics?

A. Push callback data to an Amazon RDS database that can be queried to show historical data and to alert on exceeded thresholds.
B. Push callback data to Amazon Kinesis Data Streams and invoke an AWS Lambda function that stores data in Amazon DynamoDB and sends the required alerts.
C. Push callback data to Amazon CloudWatch as a custom metric and use the CloudWatch alerting mechanisms to alert System Administrators.
D. Push callback data to AWS X-Ray and use AWS Lambda to query, display, and alert on exceeded thresholds.

答案：B

問題 #248
A Developer has been asked to build a real-time dashboard web application to visualize the key prefixes and storage size of objects in Amazon S3 buckets. Amazon DynamoDB will be used to store the Amazon S3 metadata.
What is the optimal and MOST cost-effective design to ensure that the real-time dashboard is kept up to date with the state of the objects in the Amazon S3 buckets?

A. Run a cron job within an Amazon EC2 instance to list all objects within Amazon S3 and persist the metadata into DynamoDB. Have the web application poll the DynamoDB table to reflect this change.
B. Create a new Amazon EMR cluster to get all the metadata about Amazon S3 objects; persist the metadata into DynamoDB. Have the web application poll the DynamoDB table to reflect this change.
C. Use an Amazon CloudWatch event backed by an AWS Lambda function. Issue an Amazon S3 API call to get a list of all Amazon S3 objects and persist the metadata within DynamoDB. Have the web application poll the DynamoDB table to reflect this change.
D. Use Amazon S3 Event Notification backed by a Lambda function to persist the metadata into DynamoDB. Have the web application poll the DynamoDB table to reflect this change.

答案：D

解題說明：
Cloudwatch notifications are at best every minute at extra cost. Lambda off an S3 notification will provide real-time data and lambda is the most cost effective processing method.

問題 #249
A development team consists of 10 team members. Similar to a home directory for each team member the manager wants to grant access to user-specific folders in an Amazon S3 bucket. For the team member with the username "TeamMemberX", the snippet of the IAM policy looks like this:

Instead of creating distinct policies for each team member, what approach can be used to make this policy snippet generic for all team members?

A. Use IAM policy variables
B. Use IAM policy condition
C. Use IAM policy resource
D. Use IAM policy principal

答案：A

解題說明：
Explanation
> https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_variables.html > Use AWS Identity and Access Management (IAM) policy variables as placeholders when you don't know the exact value of a resource or condition key when you write the policy.

問題 #250
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