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AWS Certified Developer – Associate Exam Questions & Answers (verified)

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AWS SQS long polling allows the SQS service to wait until a message is available in the queue before sending a response? - ✔✔true A visibility timeout is a period of time during which AWS SQS prevents other consuming components from receiving and processing the message? - ✔✔true What AWS service can you use to "fan out" SQS messages to multiple queues? - ✔✔SNS (SQS) What is the maximum long poll timeout? - ✔✔20 seconds You have a fleet of EC2 instances that are constantly polling empty SQS queues which is burning CPU complete cycles. What should you do? - ✔✔Enable SQS long polling What is the default SQS visibility time out? - ✔✔30 seconds EC2 instances download jobs from SQS queue, but are taking too long to process. What api call can you use to the length of time to process jobs? - ✔✔ChangeMessageVisibility (SQS) You are designing a new app which processes payments and delivers promotional emails to customers. Your need to ensure that the payment process takes priority over the creation of emails. What is the best way to achieve this? - ✔✔Use 2 SQS queues. Poll that payment queue first. An SQS message can NOT be delivered multiple times? - ✔✔False, SQS messages can be delivered multiple times What is the default visibility timeout for SQS? - ✔✔30 secondsHow long can SQS messages be? - ✔✔Messages can contain up to 256 KB of text in any format SQS was the second service on AWS? - ✔✔False, SQS was the first DynomaDB writes are measured in 2 KB per write? - ✔✔False, they are measured in 1 KB per write. What are the two consistency models used when reading data from DynamoDB? - ✔✔Eventually Consistent and Strongly consistent DynamoDB is a NoSQL database by AWS? - ✔✔True You have an app that needs 25 items of 13KB per second. Your app uses STRONGLY consistent reads. What should the throughput be set to? (Math problem) - ✔✔Calculate read capacity units (items up to 4 KB in size) Multiply number of items by read capacity units Do NOT divide by 2 because strongly consistent Answer: 100 One read capacity unit represents one strongly consistent read per second, or two eventually consistent reads per second, for items up to 4 KB in size? - ✔✔True When you create a table, you specify how much provisioned throughput capacity you want to reserve for reads and writes? - ✔✔True In DynamoDB, you specify provisioned throughput requirements in terms of capacity units? - ✔✔True One read capacity unit represents one X type of read per second, or two Y type of read per second? - ✔✔One strongly consistent read per second. Two eventually consistent reads per second. For items up to 4 KB in size.

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