EXAMS AWS CERTIFIED DEVELOPER - ASOCIATE 28

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An application takes 40 seconds to process instructions received in an Amazon SQSmessage.

Assuming the SQSqueue is configured with the default VisibilityTimeout value, what is the BESTway, upon receiving a message, to ensure that no other instances can retrieve a message that has already been processed or is currently being processed?

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An application reads data from an Amazon DynamoDBtable.

Several times a day, for a period of 15 seconds, the application receives multiple ProvisionedThroughputExceeded errors.

How should this exception be handled?

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A user has set an IAM policy where it allows all requests if a request from IP 10.10.10.1/32.

Another policy allows all the requests between 5 PM to 7 PM.

What will happen when a user is requesting access from IP 10.10.10.1/32 at 6 PM?

With regard to IAM, when a request is made, the AWS service decides whether a given request should be allowed or denied. The evaluation logic follows these rules: By default, all requests are denied. (In general, requests made using the account credentials for resources in the account are always allowed.) An explicit allow policy overrides this default. An explicit deny policy overrides any allows. http://docs.aws.amazon.com/IAM/latest/UserGuide/AccessPolicyLanguage_EvaluationLogic.html

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You want to have multiple versions of your application running at the same time, with all versions launched via AWS Elastic Beanstalk. Is this possible?

AWS Elastic Beanstalk is designed to support multiple running environments. As an example you could have one for integration testing, one for preproduction, and one for production, with each environment independently configured and running on its own separate AWS resources. https://aws.amazon.com/elasticbeanstalk/faqs/

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In regard to DynamoDB, what is the Global secondary index?

Global secondary index -- an index with a hash and range key that can be different from those on the table. http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DataModel.html

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In regard to AWS CloudFormation, what is a stack?

A stack is the set of AWS resources that are created and managed as a single unit when AWS CloudFormation initiates a template. http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/concept-stack.html

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A user is trying to find the state of an S3 bucket with respect to versioning.

Which of the below mentioned states AWS will not return when queried?

S3 buckets can be in one of the three states: unversioned (the default), versioning-enabled or versioning-suspended. The bucket owner can configure the versioning state of a bucket. The versioning state applies to all (never some) of the objects in that bucket. The first time owner enables a bucket for versioning, objects in it are thereafter always versioned and given a unique version ID. http://docs.aws.amazon.com/AmazonS3/latest/dev/Versioning.html

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Does Amazon DynamoDB support both increment and decrement atomic operations?

Amazon DynamoDB supports increment and decrement atomic operations. http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/APISummary.html

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