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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q268-Q273):
NEW QUESTION # 268
Which Auto Scaling process would be helpful when testing new instances before sending traffic to them, while still keeping them in your Auto Scaling Group?
- A. Suspend the process AZ Rebalance
- B. Suspend the process AddToLoadBalancer
- C. Suspend the process Replace Unhealthy
- D. Suspend the process Health Check
Answer: B
Explanation:
If you suspend Ad dTo Load Balancer, Auto Scaling launches the instances but does not add them to the load balancer or target group. If you resume the AddTo Load Balancer process. Auto Scaling resumes adding instances to the load balancer or target group when they are launched. However, Auto Scaling does not add the instances that were launched while this process was suspended. You must register those instances manually.
Option A is invalid because this just balances the number of CC2 instances in the group across the Availability Zones in the region Option B is invalid because this just checks the health of the instances. Auto Scaling marks an instance as unhealthy if Amazon CC2 or Clastic Load Balancing tells Auto Scaling that the instance is unhealthy.
Option C is invalid because this process just terminates instances that are marked as unhealthy and later creates new instances to replace them.
For more information on process suspension, please refer to the below document link: from AWS
http://docs.aws.amazon.com/autoscaling/latest/userguide/as-suspend-resume-processes.html
NEW QUESTION # 269
A developer has written an application that writes data to Amazon DynamoDB. The DynamoDB table has been configured to use conditional writes. During peak usage times, writes are failing due to a ConditionalCheckFailedException error.
How can the developer increase the application's reliability when multiple clients are attempting to write to the same record?
- A. Implement error retries and exponential backoff with jitter.
- B. Write the data to an Amazon SNS topic.
- C. Increase the amount of write capacity for the table to anticipate short-term spikes or bursts in write operations.
- D. Implement a caching solution, such as DynamoDB Accelerator or Amazon ElastiCache.
Answer: A
Explanation:
https://aws.amazon.com/premiumsupport/knowledge-center/dynamodb-table-throttled/
NEW QUESTION # 270
You have just come from your Chief Information Security Officer's (CISO) office with the instructions to provide an audit report of all AWS network rules used by the organization's Amazon EC2 instances. You have discovered that a single Describe-Security-Groups API call will return all of an account's security groups and rules within a region.
You create the following pseudo-code to create the required report:
- Parse "aws ec2 describe-security-groups" output
- For each security group
- Create report of ingress and egress rules
Which two additional pieces of logic should you include to meet the CISO's requirements?
Choose 2 answers
- A. Parse CloudFront access control lists.
- B. Evaluate AWS CloudTrail logs.
- C. Parse security groups in each region.
- D. Evaluate Elastic Load Balancing access control lists.
- E. Evaluate VPC network access control lists.
- F. Parse security groups in each Availability Zone and region.
Answer: C,E
NEW QUESTION # 271
An education company has a Docker-based application running on multiple Amazon EC2 instances in an Amazon ECS cluster. When deploying a new version of the application, the Developer, pushes a new image to a private Docker container registry, and then stops and starts all tasks to ensure that they all have the latest version of the application. The Developer discovers that the new tasks are, occasionally running with an old image.
How can this issue be prevented?
- A. After pushing the new image, restart ECS Agent, and then start the tasks.
- B. Use Amazon ECR for a Docker container registry.
- C. Use "latest" for the Docker image tag in the task definition.
- D. Update the digest on the task definition when pushing the new image.
Answer: D
Explanation:
https://docs.aws.amazon.com/en_us/AmazonECS/latest/developerguide/task_definition_paramet ers.html When a new task starts, the Amazon ECS container agent pulls the latest version of the specified image and tag for the container to use. However, subsequent updates to a repository image are not propagated to already running tasks.
NEW QUESTION # 272
A company uses AWS Storage Gateway in file gateway mode in front of an Amazon S3 bucket that is used by multiple resources. In the morning when business begins, users do not see the objects processed by a third party the previous evening. When a DevOps engineer looks directly at the S3 bucket, the data is there, but it is missing in Storage Gateway.
Which solution ensures that all the updated third-party files are available in the morning?
- A. Modify Storage Gateway to run in volume gateway mode.
- B. Instruct the third party to put data into the S3 bucket using AWS Transfer for SFTP.
- C. Configure a nightly Amazon EventBridge (Amazon CloudWatch Events) event to trigger an AWS Lambda function to run the RefreshCache command for Storage Gateway.
- D. Use S3 same-Region replication to replicate any changes made directly in the S3 bucket to Storage Gateway.
Answer: C
NEW QUESTION # 273
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