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Q241. A user has created a CIoudFormation stack. The stack creates AWS services, such as EC2 instances, ELB, AutoScaIing, and RDS. While creating the stack it created EC2, ELB and AutoScaIing but failed to create RDS. What will C|oudFormation do in this scenario?
A. Rollback all the changes and terminate all the created services
B. It will wait for the user’s input about the error and correct the mistake after the input
C. CIoudFormation can never throw an error after launching a few services since it verifies all the steps before launching
D. It will warn the user about the error and ask the user to manually create RDS
Answer: A
Explanation:
AWS CIoudFormation is an application management tool which provides application modeling, deployment, configuration, management and related actMties. The AWS CIoudFormation stack is a collection of AWS resources which are created and managed as a single unit when AWS CIoudFormation instantiates a template. If any of the services fails to launch, C|oudFormation will rollback all the changes and terminate or delete all the created services.
Reference: http://aws.amazon.com/c|oudformation/faqs/
Q242. True or False: Manually created DB Snapshots are deleted after the DB Instance is deleted.
A. TRUE
B. FALSE
Answer: A
Q243. A favored client needs you to quickly deploy a database that is a relational database service with minimal administration as he wants to spend the least amount of time administering it. Which database would be the best option?
A. Amazon Simp|eDB
B. Your choice of relational AMs on Amazon EC2 and EBS.
C. Amazon RDS
D. Amazon Redshift
Answer: C
Explanation:
Amazon Relational Database Service (Amazon RDS) is a web service that makes it easy to set up, operate, and scale a relational database in the cloud. It provides cost-efficient and resizable capacity while managing time-consuming database administration tasks, freeing you up to focus on your applications and business.
Amazon RDS gives you access to the capabilities of a familiar MySQL, Oracle, SQL Server, or PostgreSQL database engine. This means that the code, applications, and tools you already use today with your existing databases can be used with Amazon RDS. Amazon RDS automatically patches the database software and backs up your database, storing the backups for a user-defined retention period and enabling point-in-time recovery.
Reference: https://aws.amazon.com/running_databases/#rds_anchor
Q244. A user has defined an AutoScaIing termination policy to first delete the instance with the nearest billing hour. AutoScaIing has launched 3 instances in the US-East-1A region and 2 instances in the US-East-1 B region. One of the instances in the US-East-1B region is running nearest to the billing hour. Which instance will AutoScaIing terminate first while executing the termination action?
A. Random Instance from US-East-1A
B. Instance with the nearest billing hour in US-East-1 B
C. Instance with the nearest billing hour in US-East-1A
D. Random instance from US-East-1B
Answer: C
Explanation:
Even though the user has configured the termination policy, before AutoScaIing selects an instance to terminate, it first identifies the Availability Zone that has more instances than the other Availability Zones used by the group. Within the selected Availability Zone, it identifies the instance that matches the specified termination policy.
Reference: http://docs.aws.amazon.com/AutoScaIing/latest/DeveIoperGuide/us-termination-policy.html
Q245. Which IAM role do you use to grant AWS Lambda permission to access a DynamoDB Stream?
A. Dynamic role
B. Invocation role
C. Execution role
D. Event Source role
Answer: C
Explanation:
You grant AWS Lambda permission to access a DynamoDB Stream using an IAM role known as the "execution ro|e".
Reference: http://docs.aws.amazon.com/|ambda/latest/dg/intro-permission-model.htm|
Q246. If your DB instance runs out of storage space or file system resources, its status will change to _ and your DB Instance will no longer be available.
A. storage-overflow
B. storage-full
C. storage-exceed
D. storage-overage
Answer: B
Q247. Your company hosts a social media site supporting users in multiple countries. You have been asked to provide a highly available design tor the application that leverages multiple regions tor the most recently accessed content and latency sensitive portions of the wet) site The most latency sensitive component of the application involves reading user preferences to support web site personalization and ad selection. In addition to running your application in multiple regions, which option will support this app|ication's requirements?
A. Serve user content from 53. CIoudFront and use Route53 latency-based routing between ELBs in each region Retrieve user preferences from a local DynamoDB table in each region and leverage SQS to capture changes to user preferences with 505 workers for propagating updates to each table.
B. Use the 53 Copy API to copy recently accessed content to multiple regions and serve user content from 53. C|oudFront with dynamic content and an ELB in each region Retrieve user preferences from an EIasticCache cluster in each region and leverage SNS notifications to propagate user preference changes to a worker node in each region.
C. Use the 53 Copy API to copy recently accessed content to multiple regions and serve user content from 53 CIoudFront and Route53 latency-based routing Between ELBs In each region Retrieve user preferences from a DynamoDB table and leverage SQS to capture changes to user preferences with 505 workers for propagating DynamoDB updates.
D. Serve user content from 53. CIoudFront with dynamic content, and an ELB in each region Retrieve user preferences from an EIastiCache cluster in each region and leverage Simple Workflow (SWF) to manage the propagation of user preferences from a centralized OB to each EIastiCache cluster.
Answer: A
Q248. You are architecting an auto-scalable batch processing system using video processing pipelines and Amazon Simple Queue Service (Amazon SQS) for a customer. You are unsure of the limitations of SQS and need to find out. What do you think is a correct statement about the limitations of Amazon SQS?
A. It supports an unlimited number of queues but a limited number of messages per queue for each user but automatically deletes messages that have been in the queue for more than 4 weeks.
B. It supports an unlimited number of queues and unlimited number of messages per queue for each user but automatically deletes messages that have been in the queue for more than 4 days.
C. It supports an unlimited number of queues but a limited number of messages per queue for each user but automatically deletes messages that have been in the queue for more than 4 days.
D. It supports an unlimited number of queues and unlimited number of messages per queue for each user but automatically deletes messages that have been in the queue for more than 4 weeks.
Answer: B
Explanation:
Amazon Simple Queue Service (Amazon SQS) is a messaging queue service that handles message or workflows between other components in a system.
Amazon SQS supports an unlimited number of queues and unlimited number of messages per queue for each user. Please be aware that Amazon SQS automatically deletes messages that have been in the queue for more than 4 days.
Reference: http://aws.amazon.com/documentation/sqs/