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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q265-Q270):

NEW QUESTION # 265
A consulting company was hired to assess security vulnerabilities within a client company's application and propose a plan to remediate all identified issues. The architecture is identified as follows: Amazon S3 storage for content, an Auto Scaling group of Amazon EC2 instances behind an Elastic Load Balancer with attached Amazon EBS storage, and an Amazon RDS MySQL database. There are also several AWS Lambda functions that communicate directly with the RDS database using connection string statements in the code.
The consultants identified the top security threat as follows: the application is not meeting its requirement to have encryption at rest.
What solution will address this issue with the LEAST operational overhead and will provide monitoring for potential future violations?

• A. Enable SSE encryption on the S3 buckets, EBS volumes, and the RDS database. Store RDS credentials in EC2 Parameter Store. Enable a policy on the S3 bucket to deny unencrypted puts. Set up AWS Config rules to periodically check for non-encrypted S3 objects and EBS volumes, and to ensure that RDS storage is encrypted.
• B. Enable Secure Sockets Layer (SSL) on the load balancer, ensure that AWS Lambda is using SSL to communicate to the RDS database, and enable S3 encryption. Configure the application to force SSL for incoming connections and configure RDS to only grant access if the session is encrypted. Configure Amazon Inspector agents on EC2 instances to report on insecure encryption ciphers.
• C. Enable SSE encryption on the S3 buckets and RDS database. Enable OS-based encryption of data on EBS volumes. Configure Amazon Inspector agents on EC2 instances to report on insecure encryption ciphers. Set up AWS Config rules to periodically check for non-encrypted S3 objects.
• D. Configure the application to encrypt each file prior to storing on Amazon S3. Enable OS-based encryption of data on EBS volumes. Encrypt data on write to RDS. Run cron jobs on each instance to check for encrypted data and notify via Amazon SNS. Use S3 Events to call an AWS Lambda function and verify if the file is encrypted.

Answer: B
NEW QUESTION # 266
A user has attached an EBS volume to a running Linux instance as a "/dev/sdf" device.
The user is unable to see the attached device when he runs the command "df -h".
What is the possible reason for this?

• A. The volume is not in the same AZ of the instance
• B. The volume is not attached as a root device
• C. The volume is not mounted
• D. The volume is not formatted

Answer: C Explanation:
When a user creates an EBS volume and attaches it as a device, it is required to mount the device. If the device/volume is not mounted it will not be available in the listing.
NEW QUESTION # 267
You are building a game high score table in DynamoDB. You will store each user's highest score for each game, with many games, all of which have relatively similar usage levels and numbers of players. You need to be able to look up the highest score for any game. What's the best DynamoDB key structure?

• A. HighestScore as the hash/only key.
• B. GamelD as the hash key, HighestScore as the range key.
  C- GamelD as the hash/only key.
• C. GamelDastherange/onlykey.

Answer: B Explanation:
Explanation
It always best to choose the hash key as the column that will have a wide range of values. This is also given in the AWS documentation Choosing a Partition Key The following table compares some common partition key schemas for provisioned throughput efficiency:

Next since you need to sort by the Highest Score, you need to use that as the sort key For more information on Table Guidelines, please visit the below URL:
* http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GuidelinesForTables.html
NEW QUESTION # 268
A company used AWS CloudFormation to deploy a three-tier web application that stores data in an Amazon RDS MySOL Multi-AZ DB instance. A DevOps Engineer must upgrade the RDS instance to the latest major version of MySQL while incurring minimal downtime. How should the Engineer upgrade the instance while minimizing downtime?

• A. Update the EngineVersion property of the AWS::RDS:: DBInstance resource type in the CloudFormation template to the latest desired version. Launch a second stack and make the new RDS instance a read replica.
• B. Update the EngineVersion property of the AWS :: RDS :: DBInstance resource type in the CloudFormation template to the latest version, and perform an Update Stack operation.
• C. Update the DBEngineVersion property of the AWS: :RDS: :DB:Instance resource type in the CloudFormation template to the latest desired version. Create a new RDS Read Replicas resource with the same properties as the instance to be upgraded. Perform an Update Stack operation.
• D. Update the DBEngineVersion property of the AWS: : RDS : :DBInstance resource type in the CloudFormation template to the latest desired version. Perform an Update Stack operation.
  Create a new RDS Read Replicas resource with the same properties as the instance to be upgraded. Perform a second Update Stack operation.

Answer: A Explanation:
https://aws.amazon.com/pt/blogs/mt/how-to-set-up-aws-opsworks-stacks-auto-healing- notifications-in-amazon-cloudwatch-events/
NEW QUESTION # 269
You have an Auto Scaling group of Instances that processes messages from an Amazon Simple Queue Service
(SQS) queue. The group scales on the size of the queue. Processing Involves calling a third-party web service.
The web service is complaining about the number of failed and repeated calls it is receiving from you. You
have noticed that when the group scales in, instances are being terminated while they are processing. What
cost-effective solution can you use to reduce the number of incomplete process attempts?

• A. Increase the minimum and maximum size for the Auto Scalinggroup, and change the scaling policies so
  they scale less dynamically.
• B. Modify the application running on the instances to enable termination protection while it processes a
  task and disable it when the processing is complete.
• C. Modify the application running on the instances to put itself into an Auto Scaling Standby state while it
  processes a task and return itself to InService when the processing is complete.
• D. Create a new Auto Scaling group with minimum and maximum of 2 and instances running web proxy
  software. Configure the VPC route table to route HTTP traffic to these web proxies.

Answer: C Explanation:
Explanation
The following diagram shows the lifecycle of the instances in Autoscaling

You can put the instances in a standby state, via the application, do the processing and then put the instance
back in a state where it can be governed by the
Autoscaling Group.
For more information on the Autoscaling Group Lifecycle please refer to the below link:
* http://docs.aws.amazon.com/autoscaling/latest/userguide/AutoScaingGrouplifecycle.htm
I
Note: As per AWS documentation.
To control whether an Auto Scaling group can terminate a particular instance when scaling in, use instance
protection.
It is termed as Instance protection rather than termination protection when we refer it with "Scaling in process"
of ASG.
For more information please view the following link:
https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-instance-termination.htmlffinstance-protection-instan
NEW QUESTION # 270
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