AWS-Certified-Developer-Associate Exam
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Q11. A user has enabled the automated backup, but not specified the backup window. What will RDS do in this case?
A. Will throw an error on instance launch
B. RDS will take 3 AM — 3:30 AM as the default window
C. RDS assigns a random time period based on the region
D. Will not allow to launch a DB instance
Answer: C
Explanation:
If the user does not specify a preferred backup window while enabling an automated backup, Amazon RDS assigns a default 30-minute backup window which is selected at random from an 8-hour block of
time per region. Reference:
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Overview.BackingUpAndRestoringAmazonR DSInstances.htmI
Q12. A user has created a new EBS volume from an existing snapshot. The user mounts the volume on the instance to which it is attached. Which of the below mentioned options is a required step before the user can mount the volume?
A. Run a cyclic check on the device for data consistency
B. Create the file system of the volume
C. Resize the volume as per the original snapshot size
D. No step is required. The user can directly mount the device
Answer: D
Explanation:
When a user is trying to mount a blank EBS volume, it is required that the user first creates a file system within the volume. If the volume is created from an existing snapshot then the user needs not to create a file system on the volume as it will wipe out the existing data.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-using-volumes.htmI
Q13. A user has launched an EC2 instance and installed a website with the Apache webserver. The webserver is running but the user is not able to access the website from the internet. What can be the possible reason for this failure?
A. The security group of the instance is not configured properly.
B. The instance is not configured with the proper key-pairs.
C. The Apache website cannot be accessed from the internet.
D. Instance is not configured with an elastic IP.
Answer: A
Explanation:
In Amazon Web Services, when a user has configured an instance with Apache, the user needs to ensure that the ports in the security group are opened as configured in Apache config. E.g. If Apache is running on port 80, the user should open port 80 in the security group.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-network-security.html
Q14. You have a number of image files to encode. In an Amazon SQS worker queue, you create an Amazon SQS message for each file specifying the command (jpeg-encode) and the location of the file in Amazon S3. Which of the following statements best describes the functionality of Amazon SQS?
A. Amazon SQS is for single-threaded sending or receMng speeds.
B. Amazon SQS is a non-distributed queuing system.
C. Amazon SQS is a distributed queuing system that is optimized for horizontal scalability, not for single-threaded sending or receMng speeds.
D. Amazon SQS is a distributed queuing system that is optimized for vertical scalability and for single-threaded sending or receMng speeds.
Answer: C
Explanation:
Amazon SQS is a distributed queuing system that is optimized for horizontal scalability, not for
single-threaded sending or receMng speeds. A single client can send or receive Amazon SQS messages at a rate of about 5 to 50 messages per second. Higher receive performance can be achieved by requesting multiple messages (up to 10) in a single call. It may take several seconds before a message that has been to a queue is available to be received.
Reference: http://media.amazonwebservices.com/AWS_Storage_Options.pdf
Q15. A user is planning to make a mobile game which can be played online or offline and will be hosted on EC2.
The user wants to ensure that if someone breaks the highest score or they achieve some milestone they can inform all their colleagues through email. Which of the below mentioned AWS services helps achieve this goal?
A. AWS Simple Workflow Service.
B. AWS Simple Queue Service.
C. Amazon Cognito
D. AWS Simple Email Service.
Answer: D
Explanation:
Amazon Simple Email Service (Amazon SES) is a highly scalable and cost-effective email-sending service for businesses and developers. It integrates with other AWS services, making it easy to send emails from applications that are hosted on AWS.
Reference: http://aws.amazon.com/ses/faqs/
Q16. 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?
A. It is not possible to access RDS of the US East region from the US West region
B. Open the security group of the US West region in the RDS security group’s ingress rule
C. Configure the IP range of the US West region instance as the ingress security rule of RDS
D. Create an IAM role which has access to RDS and launch an instance in the US West region with it
Answer: C
Explanation:
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.
Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_WorkingWithSecurityGroups.html
Q17. can be used to bootstrap both the Chef Server and Chef Client software on your EC2 instances.
A. AWS CIoudFormation
B. AWS Elastic Beanstalk
C. AWS OpsWorks
D. Amazon Glacier
Answer: A
Explanation:
AWS CIoudFormation can be used to bootstrap both the Chef Server and Chef Client software on your EC2 instances.
Reference: http://aws.amazon.com/c|oudformation/faqs/
Q18. A user has created photo editing software and hosted it on EC2. The software accepts requests from the user about the photo format and resolution and sends a message to S3 to enhance the picture accordingly. Which of the below mentioned AWS services will help make a scalable software with the AWS infrastructure in this scenario?
A. AWS Elastic Transcoder
B. AWS Simple Notification Service
C. AWS Simple Queue Service
D. AWS Glacier
Answer: C
Explanation:
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. The user can configure SQS, which will decouple the call between the EC2 application and S3. Thus, the application does not keep waiting for S3 to provide the data.
Reference: http://aws.amazon.com/sqs/faqs/
Q19. In AWS Elastic Beanstalk, if the application returns any response other than 200 ,OK or there is no response within the configured InactMtyTimeout period, .
A. SQS once again makes the message visible in the queue and available for another attempt at processing
B. SQS waits for another timeout
C. SQS run DeIeteMessagecaII and deletes the message from the queue
D. SQS sends a message to the application with the lVIessageID and pending status
Answer: A
Explanation:
In AWS Elastic Beanstalk, if the application returns any response other than 200, OK or there is no response within the configured InactMtyTimeout period, SQS once again makes the message visible in the queue and available for another attempt at processing.
Reference:
http://docs.aws.amazon.com/elasticbeanstaIk/latest/dg/using-features-managing-env-tiers.htmI#worker-e nviron
Q20. A user plans to use RDS as a managed DB platform. Which of the below mentioned features is not supported by RDS?
A. Automated backup
B. Automated scaling to manage a higher load
C. Automated failure detection and recovery
D. Automated software patching
Answer: B
Explanation:
AWS RDS provides a managed DB platform, which offers features, such as automated backup, patch management, automated failure detection and recovery. The scaling is not automated and the user needs to plan it with a few clicks.
Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Welcome.html