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Correct Answer: A

Explanation:

A user can stop/start or reboot an EC2 instance using the AWS console, the Amazon EC2 CLI or the

Amazon EC2 API. Rebooting an instance is equivalent to rebooting an operating system. When the

instance is rebooted AWS will not charge the user for the extra hours. In case the user stops the instance,

AWS does not charge the running cost but charges only the EBS storage cost. If the user starts and stops

the instance multiple times in a single hour, AWS will charge the user for every start and stop. In this case,

since the instance was rebooted twice, it will cost the user for 3 instance hours.

Correct Answer: C

Explanation: Amazon RDS provides high availability and failover support for DB instances using Multi-AZ deployments. In a Multi-AZ deployment, Amazon RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone. The primary DB instance is synchronously replicated across Availability Zones to a standby replica to provide data redundancy, eliminate I/O freezes, and minimize latency spikes during system backups. Running a DB instance with high availability can enhance availability during planned system maintenance, and help protect your databases against DB instance failure and Availability Zone disruption. Note that the high-availability feature is not a scaling solution for read-only scenarios; you cannot use a standby replica to serve read traffic. To service read-only traffic, you should use a read replica.

Correct Answer: A

Explanation:

In Amazon CloudFront, if you chose On for Logging, the logs store in the Amazon S3 bucket that you want

CloudFront to store access logs in. For example:

myawslogbucket.s3.amazonaws.com

If you enable logging, CloudFront records information about each end-user request for an object and

stores the files in the specified Amazon S3 bucket.

Reference:

http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/distribution-web-valuesspecify.html#DownloadDistValuesLoggingOnOff

Correct Answer: CD

Explanation: The CloudTrail log file integrity validation process also lets you know if a log file has been deleted or changed, or assert positively that no log files were delivered to your account during a given period of time. CloudTrail log file integrity validation uses industry standard algorithms: SHA-256 for hashing and SHA256 with RSA for digital signing. This makes it computationally unfeasible to modify, delete or forge CloudTrail log files without detection. T Configuring multi-factor authentication (MFA) ensures that any attempt to change the versioning state of your bucket or permanently delete an object version requires additional authentication. This helps prevent any operation that could compromise the integrity of your log files, even if a user acquires the password of an IAM user that has permissions to permanently delete Amazon S3 objects. Reference: https://docs.aws.amazon.com/awscloudtrail/latest/userguide/best-practices-security.html

Correct Answer: AB

Reference: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ automating_with_cloudwatch_events.html