EXAMS AWS CERTIFIED DEVELOPER - ASOCIATE 15

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When you use the AWS Elastic Beanstalk console to deploy a new application you'll need to upload a source bundle and it should _____________________

When you use the AWS Elastic Beanstalk console to deploy a new application or an application version, you'll need to upload a source bundle. Your source bundle must meet the following requirements: Consist of a single .zip file or .war file Not exceed 512 MB Not include a parent folder or top-level directory (subdirectories are fine) http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features.deployment.source.html

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A user has enabled serverside encryption with S3.

The user downloads the encrypted object from S3.

How can the user decrypt it?

If the user is using the server-side encryption feature, Amazon S3 encrypts the object data before saving it on disks in its data centres and decrypts it when the user downloads the objects. Thus, the user is free from the tasks of managing encryption, encryption keys, and related tools. http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingEncryption.html

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How does Amazon SQS allow multiple readers to access the same message queue without losing messages or processing them many times?

Every Amazon SQS queue has a configurable visibility timeout. For the designated amount of time after a message is read from a queue, it will not be visible to any other reader. As long as the amount of time that it takes to process the message is less than the visibility timeout, every message will be processed and deleted. In the event that the component processing the message fails or becomes unavailable, the message will again become visible to any component reading the queue once the visibility timeout ends. This allows you to have many components all reading messages from the same queue, with each working to process different messages. https://aws.amazon.com/sqs/faqs/

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A user has not enabled versioning on an S3 bucket.

What will be the version ID of the object inside that bucket?

S3 objects stored in the bucket before the user has set the versioning state have a version ID of null. When the user enables versioning, the objects in the bucket do not change and their ID remains null. http://docs.aws.amazon.com/AmazonS3/latest/dev/AddingObjectstoVersionSuspendedBuckets.ht ml

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A user has hosted a website on AWS and uses ELB to load balance the multiple instances.

The user application does not have any cookie management.

How can the user bind the session of the requestor with a particular instance?

The key to manage the sticky session is determining how long the load balancer should route the user's request to the same application instance. If the application has its own session cookie, then the user can set the Elastic Load Balancing to create the session cookie to follow the duration specified by the application's session cookie. If the user's application does not have its own session cookie, then he can set the Elastic Load Balancing to create a session cookie by specifying his own stickiness duration.

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A user has launched one EC2 instance in the US West region.

The user wants to access the RDS instance launched in the US East region from that EC2 instance.

How can the user configure the access for that EC2 instance?

The user cannot authorize an Amazon EC2 security group if it is in a different AWS Region than the RDS DB instance. The user can authorize an IP range or specify an Amazon EC2 security group in the same region that refers to an IP address in another region.

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In regards to Amazon SQS how many times will you receive each message?

Amazon SQS is engineered to provide "at least once" delivery of all messages in its queues. Although most of the time, each message will be delivered to your application exactly once, you should design your system so that processing a message more than once does not create any errors or inconsistencies. https://aws.amazon.com/sqs/faqs/

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In relation to Amazon SQS, how can you ensure that messages are delivered in order?

Amazon SQS makes a best effort to preserve order in messages, but due to the distributed nature of the queue, AWS cannot guarantee that you will receive messages in the exact order you sent them. You typically place sequencing information or timestamps in your messages so that you can reorder them upon receipt. https://aws.amazon.com/items/1343?externalID=1343

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