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AWS-DevOps-Engineer-Professional 試験

最新更新時間: 2019/05/15,合計40問。

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Question No : 1
Which major database needs a BYO license?

正解:
Explanation:
Oracle is not open source, and requires a bring your own license model.
Reference: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Oracle.html

Question No : 2
You are building a deployment system on AWS. You will deploy new code by bootstrapping instances in a private subnet in a VPC at runtime using UserData scripts pointing to an S3 zip file object, where your code is stored. An ELB in a public subnet has network interfaces and connectivity to the instances. Requests from users of the system are routed to the ELB via a Route53 A Record Alias. You do not use any VPC endpoints.
Which is a risk of using this approach?

正解:
Explanation:
Since you are not using VPC endpoints, outbound requests for the code sitting in S3 are routed though the NAT for the VPC's private subnets. If this networking fails, runtime bootstrapping through code download will fail due to network unavailability and lack of access to the Internet, and thus Amazon S3.
Reference: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_NAT_Instance.html

Question No : 3
Which of the following are not valid sources for OpsWorks custom cookbook repositories?

正解:
Explanation:
Linux stacks can install custom cookbooks from any of the following repository types: HTTP or Amazon S3 archives. They can be either public or private, but Amazon S3 is typically the preferred option for a private archive. Git and Subversion repositories provide source control and the ability to have multiple versions.
Reference:
http://docs.aws.amazon.com/opsworks/latest/userguide/workingcookbook-installingcustom-enable.html

Question No : 4
Which of these techniques enables the fastest possible rollback times in the event of a failed deployment?

正解:
Explanation:
AWS specifically recommends Blue-Green for super-fast, zero-downtime deploys - and thus rollbacks, which are redeploying old code.
You use various strategies to migrate the traffic from your current application stack (blue) to a new version of the application (green). This is a popular technique for deploying applications with zero downtime.
Reference: https://d0.awsstatic.com/whitepapers/overview-of-deployment-options-on-aws.pdf

Question No : 5
Which deployment method, when using AWS Auto Scaling Groups and Auto Scaling Launch Configurations, enables the shortest time to live for individual servers?

正解:
Explanation:
Note that the bootstrapping process can be slower if you have a complex application or multiple applications to install. Managing a fleet of applications with several build tools and dependencies can be a challenging task during rollouts. Furthermore, your deployment service should be designed to do faster rollouts to take advantage of Auto Scaling. Prebaking is a process of embedding a significant portion of your application artifacts within your base AMI. During the deployment process you can customize application installations by using EC2 instance artifacts such as instance tags, instance metadata, and Auto Scaling groups.
Reference: https://d0.awsstatic.com/whitepapers/overview-of-deployment-options-on-aws.pdf

Question No : 6
When thinking of DynamoDB, what are true of Local Secondary Key properties?

正解:
Explanation:
Global secondary index ― an index with a partition key and a sort key that can be different from those on the table. A global secondary index is considered "global" because queries on the index can span all of the data in a table, across all partitions.
Reference:
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/SecondaryIndexes.html

Question No : 7
You run operations for a company that processes digital wallet payments at a very high volume. One second of downtime, during which you drop payments or are otherwise unavailable, loses you on average USD 100. You balance the financials of the transaction system once per day.
Which database setup is best suited to address this business risk?

正解:
Explanation:
Only the multi-master, multi-region DynamoDB answer makes sense. Multi-AZ deployments do not provide sufficient availability when a business loses USD 360,000 per hour of unavailability. As RDS does not natively support multi-region, and ACID does not perform well/at all over large distances between regions, only the DynamoDB answer works.
Reference:
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Streams.CrossRegionRepl.html

Question No : 8
There are a number of ways to purchase compute capacity on AWS.
Which orders the price per compute or memory unit from LOW to HIGH (cheapest to most expensive), on average?
A. On-Demand B. Spot C. Reserved
A. A, B, C
B. C, B, A
C. B, C, A
D. A, C, B

正解: C
Explanation:
Spot instances are usually many, many times cheaper than on-demand prices. Reserved instances, depending on their term and utilization, can yield approximately 33% to 66% cost savings. On-Demand prices are the baseline price and are the most expensive way to purchase EC2 compute time.
Reference: https://d0.awsstatic.com/whitepapers/Cost_Optimization_with_AWS.pdf

Question No : 9
You are getting a lot of empty receive requests when using Amazon SQS. This is making a lot of unnecessary network load on your instances.
What can you do to reduce this load?

正解:
Explanation:
One benefit of long polling with Amazon SQS is the reduction of the number of empty responses, when there are no messages available to return, in reply to a ReceiveMessage request sent to an Amazon SQS queue. Long polling allows the Amazon SQS service to wait until a message is available in the queue before sending a response.
Reference:
http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-long-polling.html

Question No : 10
When thinking of AWS Elastic Beanstalk's model, which is true?

正解:
Explanation:
Applications group logical services. Environments belong to Applications, and typically represent different deployment levels (dev, stage, prod, fo forth). Deployments belong to environments, and are pushes of bundles of code for the environments to run.
Reference: http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/Welcome.html

Question No : 11
You want to pass queue messages that are 1GB each.
How should you achieve this?

正解:
Explanation:
You can manage Amazon SQS messages with Amazon S3. This is especially useful for storing and retrieving messages with a message size of up to 2 GB. To manage Amazon SQS messages with Amazon S3, use the Amazon SQS Extended Client Library for Java.
Reference:
http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/s3-messages.html

Question No : 12
For AWS Auto Scaling, what is the first transition state an existing instance enters after leaving steady state in Standby mode?

正解:
Explanation:
You can put any instance that is in an InService state into a Standby state. This enables you to remove the instance from service, troubleshoot or make changes to it, and then put it back into service. Instances in a Standby state continue to be managed by the Auto Scaling group. However, they are not an active part of your application until you put them back into service.
Reference:
http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/AutoScalingGroupLifecycle.html

Question No : 13
What is the scope of an EC2 EIP?

正解:
Explanation:
An Elastic IP address is tied to a region and can be associated only with an instance in the same region.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/resources.html

Question No : 14
Which status represents a failure state in AWS CloudFormation?

正解:
Explanation:
ROLLBACK_IN_PROGRESS means an UpdateStack operation failed and the stack is in the process of trying to return to the valid, pre-update state. UPDATE_COMPLETE_CLEANUP_IN_PROGRESS means an update was successful, and CloudFormation is deleting any replaced, no longer used resources. ROLLBACK_FAILED is not a CloudFormation state (but UPDATE_ROLLBACK_FAILED is). DELETE_COMPLETE_WITH_ARTIFACTS does not exist at all.
Reference:
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks.html

Question No : 15
You need to perform ad-hoc analysis on log data, including searching quickly for specific error codes and reference numbers.
Which should you evaluate first?

正解:
Explanation:
Amazon Elasticsearch Service (Amazon ES) is a managed service that makes it easy to deploy, operate, and scale Elasticsearch clusters in the AWS cloud. Elasticsearch is a popular open-source search and analytics engine for use cases such as log analytics, real-time application monitoring, and click stream analytics.
Reference:
http://docs.aws.amazon.com/elasticsearch-service/latest/developerguide/what-is-amazon-elasticsearch-service.html

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