EXAMS AWS CERTIFIED DEVELOPER - ASOCIATE 20

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A user is planning to host a web server as well as an app server on a single EC2 instance which is a part of the public subnet of a VPC.

How can the user setup to have two separate public IPs and separate security groups for both the application as well as the web server?

If you need to host multiple websites(with different IPs) on a single EC2 instance, the following is the suggested method from AWS. Launch a VPC instance with two network interfaces Assign elastic IPs from VPC EIP pool to those interfaces (Because, when the user has attached more than one network interface with an instance, AWS cannot assign public IPs to them.) Assign separate Security Groups if separate Security Groups are needed This scenario also helps for operating network appliances, such as firewalls or load balancers that have multiple private IP addresses for each network interface. http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/MultipleIP.html

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A user is setting up an Elastic Load Balancer(ELB).

Which of the below parameters should the user consider so as the instance gets registered with the ELB?

RESPUESTA CORRECTA: D The EC2 instances are registered with the load balancer using the IP addresses associated with the instances. When an instance is stopped and then started, the IP address associated with the instance changes. This prevents the load balancer from routing traffic to the restarted instance. When the user stops and then starts registered EC2 instances, it is recommended that to de- register the stopped instance from load balancer, and then register the restarted instance. Failure to do so may prevent the load balancer from performing health checks and routing the traffic to the restarted instance.

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Your supervisor has asked you to build a simple file synchronization service for your department.

He doesn't want to spend too much money and he wants to be notified of any changes to files by email.

What do you think would be the best Amazon service to use for the email solution?

File change notifications can be sent via email to users following the resource with Amazon Simple Email Service (Amazon SES), an easy-to-use, costeffective email solution. http://media.amazonwebservices.com/architecturecenter/AWS_ac_ra_filesync_08.pdf

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When a user is launching an instance with EC2, which of the below mentioned options is not available during the instance launch console for a key pair?

While launching an EC2 instance, the user can create a new key pair, select an existing key pair or proceed without a key pair. The user cannot upload a new key pair in the EC2 instance launch console. http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/launching-instance.html

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A user has developed an application which is required to send the data to a NoSQL database.

The user wants to decouple the data sending such that the application keeps processing and sending data but does not wait for an acknowledgement of DB.

Which of the below mentioned applications helps in this scenario?

Amazon Simple Queue Service (SQS) is a fast, reliable, scalable, and fully managed message queuing service. SQS provides a simple and cost-effective way to decouple the components of an application. In this case, the user can use AWS SQS to send messages which are received from an application and sent to DB. The application can continue processing data without waiting for any acknowledgement from DB. The user can use SQS to transmit any volume of data without losing messages or requiring other services to always be available. http://aws.amazon.com/sqs/

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In regard to DynamoDB, can I modify the index once it is created?

Currently, in DynamoDB, an index cannot be modified once it is created. http://aws.amazon.com/dynamodb/faqs/#security_anchor

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An EC2 instance has one additional EBS volume attached to it.

How can a user attach the same volume to another running instance in the same AZ?

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In AWS Elastic Beanstalk, if the application returns any response other than 200 ,OK or there is no response within the configured InactivityTimeout period, __________

In AWS Elastic Beanstalk, if the application returns any response other than 200, OK or there is no response within the configured InactivityTimeout period, SQS once again makes the message visible in the queue and available for another attempt at processing.

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