In AWS CloudFormation, what is a circular dependency?
Correct Answer:
B
🗳️
To resolve a dependency error, add a Depends On attribute to resources that depend on other resources in your template. In some cases, you must explicitly declare dependencies so that AWS CloudFormation can create or delete resources in the correct order. For example, if you create an Elastic IP and a VPC with an Internet gateway in the same stack, the Elastic IP must depend on the Internet gateway attachment. For additional information, see Depends On Attribute.
Reference:
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/troubleshooting.html#troubleshooting-errors-dependency-error
Which of the following assertions is accurate in the context of AWS CloudFormation?
Correct Answer:
D
🗳️
In AWS CloudFormation, actual resource names are a combination of the stack and logical resource name. This allows multiple stacks to be created from a template without fear of name collisions between AWS resources.
Reference:
https://aws.amazon.com/cloudformation/faqs/
A projection in DynamoDB is__________.
Correct Answer:
D
🗳️
In DynamoDB, a projection is the set of attributes that is copied from a table into a secondary index.
Reference:
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GSI.html
Amazon ElastiCache supports which of the following cache engines?
Correct Answer:
A
🗳️
The cache engines supported by Amazon ElastiCache are Memcached and Redis.
Reference:
http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/SelectEngine.html
What is a quiet push notification in Amazon Cognito?
Correct Answer:
A
🗳️
Amazon Cognito uses the Amazon Simple Notification Service (SNS) to send silent push notifications to devices. A silent push notification is a push message that is received by your application on a user's device that will not be seen by the user.
Reference:
http://aws.amazon.com/cognito/faqs/
The default cache port in Amazon ElastiCache is:
Correct Answer:
D
🗳️
In Amazon ElastiCache, you can specify a new port number for your cache cluster, which by default is 11211 for Memcached and 6379 for Redis.
Reference:
http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/GettingStarted.AuthorizeAccess.html
Which of the following settings should the user adjust to manually scale out AWS resources using AutoScaling?
Correct Answer:
B
🗳️
The Manual Scaling as part of Auto Scaling allows the user to change the capacity of Auto Scaling group. The user can add / remove EC2 instances on the fly. To execute manual scaling, the user should modify the desired capacity. AutoScaling will adjust instances as per the requirements.
Reference:
http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/as-manual-scaling.html
As one of the AWS resource categories, AWS ________supports__________ environments.
Correct Answer:
B
🗳️
AWS CloudFormation and AWS Elastic Beanstalk services are designed to complement each other. AWS CloudFormation supports Elastic Beanstalk application environments as one of the AWS resource types.
Reference:
http://aws.amazon.com/cloudformation/faqs/
Which of the following statements concerning delegating authorization to perform API calls is NOT accurate in the context of IAM roles for Amazon EC2?
Correct Answer:
A
🗳️
Amazon designed IAM roles so that your applications can securely make API requests from your instances, without requiring you to manage the security credentials that the applications use.
Instead of creating and distributing your AWS credentials, you can delegate permission to make API requests using IAM roles as follows: Create an IAM role.
Define which accounts or AWS services can assume the role. Define which API actions and resources the application can use after assuming the role. Specify the role when you launch your instances. Have the application retrieve a set of temporary credentials and use them.
Reference:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html
Which of the following configurations should be utilized when I/O speed is more essential than fault tolerance?
Correct Answer:
C
🗳️
When I/O performance is more important than fault tolerance, the RAID 0 configuration must be used; for example, as in a heavily used database (where data replication is already set up separately).
Reference:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/raid-config.html