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[General] Valid AWS-DevOps-Engineer-Professional Exam Materials & New AWS-DevOps-Engin

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【General】 Valid AWS-DevOps-Engineer-Professional Exam Materials & New AWS-DevOps-Engin

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SDLC Automation (22%)
  • Defining the strategies for source control;
  • Applying the concepts for integrating and automating testing;
  • Applying the concepts required for automating a CD/CI pipeline.
  • Applying the concepts for managing and building artifacts securely;
  • Determining the deployment strategies;
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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q196-Q201):NEW QUESTION # 196
A company wants to use Amazon DynamoDB for maintaining metadata on its forums. See the sample data set in the image below.

A DevOps Engineer is required to define the table schema with the partition key, the sort key, the local secondary index, projected attributes, and fetch operations. The schema should support the following example searches using the least provisioned read capacity units to minimize cost.
- Search within ForumName for items where the subject starts with `a'.
- Search forums within the given LastPostDateTime time frame.
- Return the thread value where LastPostDateTime is within the last
three months.
Which schema meets the requirements?
  • A. Use ForumName as the primary key and Subject as the sort key. Have LSI with LastPostDateTime as the sort key and the projected attribute thread.
  • B. Use ForumName as the primary key and Subject as the sort key. Have LSI with Thread as the sort key and the projected attribute LastPostDateTime.
  • C. Use Subject as the primary key and ForumName as the sort key. Have LSI with LastPostDateTime as the sort key and fetch operations for thread.
  • D. Use Subject as the primary key and ForumName as the sort key. Have LSI with Thread as the sort key and fetch operations for LastPostDateTime.
Answer: A
Explanation:
https://docs.aws.amazon.com/amaz ... loperguide/LSI.html project the Replies attribute, sort key (Subject), local secondary indexes on non-key attributes LastPostDateTime.

NEW QUESTION # 197
You have been asked to de-risk deployments at your company. Specifically, the CEO is concerned about outages that occur because of accidental inconsistencies between Staging and Production, which sometimes cause unexpected behaviors in Production even when Staging tests pass. You already use Docker to get high consistency between Staging and Production for the application environment on your EC2 instances. How do you further de-risk the rest of the execution environment, since in AWS, there are many service components you may use beyond EC2 virtual machines?
  • A. Develop models of your entire cloud system in CloudFormation. Use this model in Staging and Production to achieve greater parity.
  • B. Use AMIs to ensure the whole machine, including the kernel of the virual machines, is consistent, since Docker uses Linux Container (LXC) technology, and we need to make sure the container environment is consistent.
  • C. Use AWS Config to force the Staging and Production stacks to have configuration parity. Any differences will be detected for you so you are aware of risks.
  • D. Use AWS ECS and Docker clustering. This will make sure that the AMIs and machine sizes are the same across both environments.
Answer: A
Explanation:
Only CloudFormation's JSON Templates allow declarative version control of repeatably deployable models of entire AWS clouds.
https://blogs.aws.amazon.com/app ... gory/Best+practices

NEW QUESTION # 198
Your serverless architecture using AWS API Gateway, AWS Lambda, and AWS DynamoDB experienced
a large increase in traffic to a sustained 400 requests per second, and dramatically increased in failure
rates. Your requests, during normal operation, last 500 milliseconds on average. Your DynamoDB table
did not exceed 50% of provisioned throughput, and Table primary keys are designed correctly. What is
the most likely issue?
  • A. Your API Gateway deployment is throttling your requests.
  • B. Your AWS API Gateway Deployment is bottlenecking on request (de)serialization.
  • C. You did not request a limit increase on concurrent Lambda function executions.
  • D. You used Consistent Read requests on DynamoDB and are experiencing semaphore lock.
Answer: C
Explanation:
AWS API Gateway by default throttles at 500 requests per second steady-state, and 1000 requests per
second at spike. Lambda, by default, throttles at 100 concurrent requests for safety. At 500 milliseconds
(half of a second) per request, you can expect to support 200 requests per second at 100 concurrency.
This is less than the 400 requests per second your system now requires. Make a limit increase request via
the AWS Support Console.
AWS Lambda: Concurrent requests safety throttle per account -> 100
Reference: http://docs.aws.amazon.com/gener ... .html#limits_lambda

NEW QUESTION # 199
A Development team is building more than 40 applications. Each app is a three-tiered web application based on an ELB Application Load Balancer, Amazon EC2, and Amazon RDS. Because the applications will be used internally, the Security team wants to allow access to the 40 applications only from the corporate network and block access from external IP addresses. The corporate network reaches the internet through proxy servers. The proxy servers have 12 proxy IP addresses that are being changed one or two times per month. The Network Infrastructure team manages the proxy servers; they upload the file that contains the latest proxy IP addresses into an Amazon S3 bucket. The DevOps Engineer must build a solution to ensure that the applications are accessible from the corporate network.
Which solution achieves these requirements with MINIMAL impact to application development, MINIMAL operational effort, and the LOWEST infrastructure cost?
  • A. Implement an AWS Lambda function to read the list of proxy IP addresses from the S3 object and to update the ELB security groups to allow HTTPS only from the given IP addresses. Configure the S3 bucket to invoke the Lambda function when the object is updated. Save the IP address list to the S3 bucket when they are changed.
  • B. Ensure that all the applications are hosted in the same Virtual Private Cloud (VPC). Otherwise, consolidate the applications into a single VPC. Establish an AWS Direct Connect connection with an active/standby configuration. Change the ELB security groups to allow only inbound HTTPS connections from the corporate network IP addresses.
  • C. Implement a Python script with the AWS SDK for Python (Boto), which downloads the S3 object that contains the proxy IP addresses, scans the ELB security groups, and updates them to allow only HTTPS inbound from the given IP addresses. Launch an EC2 instance and store the script in the instance. Use a cron job to execute the script daily.
  • D. Enable ELB security groups to allow HTTPS inbound access from the Internet. Use Amazon Cognito to integrate the company's Active Directory as the identity provider. Change the 40 applications to integrate with Amazon Cognito so that only company employees can log into the application. Save the user access logs to Amazon CloudWatch Logs to record user access activities
Answer: A

NEW QUESTION # 200
Which of the following services can be used to implement DevOps in your company.
  • A. All of the above
  • B. AWSOpswork
  • C. AWS Elastic Beanstalk
  • D. AWS Cloudformation
Answer: A
Explanation:
Explanation
All of the services can be used to implement Devops in your company
1) AWS Elastic Beanstalk, an easy-to-use service for deploying and scaling web applications and services
developed with Java, .NET, PHP, Node.js, Python, Ruby, Go, and Docker on servers such as Apache, Nginx,
Passenger, and I IS.
2) AWS Ops Works, a configuration management service that helps you configure and operate applications of
all shapes and sizes using Chef
3) AWS Cloud Formation, which is an easy way to create and manage a collection of related AWS resources,
provisioning and updating them in an orderly and predictable fashion.
For more information on AWS Devops please refer to the below link:
* http://docs.aws.amazon.com/devops/latest/gsg/welcome.html

NEW QUESTION # 201
......
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