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試験科目:AWS Certified DevOps Engineer - Professional
問題と解答:全102問 AWS-DevOps 過去問

>> AWS-DevOps 過去問


NO.1 Which of these techniques enables the fastest possible rollback times in the event of a failed
A. Blue-Green
B. Canary or A/B
C. Rolling; Mutable
D. Rolling; Immutable
Answer: A

AWS-DevOps ソフト   
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
of the application (green). This is a popular technique for deploying applications with zero downtime.

NO.2 What is web identity federation?
A. Use of AWS IAM User tokens to log in as a Google or Facebook user.
B. Use of an identity provider like Google or Facebook to exchange for temporary AWS security
C. Use of an identity provider like Google or Facebook to become an AWS IAM User.
D. Use of AWS STS Tokens to log in as a Google or Facebook user.
Answer: B

AWS-DevOps 練習   
... users of your app can sign in using a well-known identity provider (IdP) -such as Login with
Facebook, Google, or any other OpenID Connect (OIDC)-compatible IdP, receive an authentication
and then exchange that token for temporary security credentials in AWS that map to an IAM role
permissions to use the resources in your AWS account.

NO.3 Your system automatically provisions EIPs to EC2 instances in a VPC on boot. The system
provisions the
whole VPC and stack at once. You have two of them per VPC. On your new AWS account, your
to create a Development environment failed, after successfully creating Staging and Production
environments in the same region. What happened?
A. You hit the soft limit of 2 VPCs per region and requested a 3rd.
B. You didn't set the Development flag to true when deploying EC2 instances.
C. You didn't choose the Development version of the AMI you are using.
D. You hit the soft limit of 5 EIPs per region and requested a 6th.
Answer: D
There is a soft limit of 5 EIPs per Region for VPC on new accounts. The third environment could not
allocate the 6th EIP.

NO.4 Your system uses a multi-master, multi-region DynamoDB configuration spanning two regions
to achieve
high availablity. For the first time since launching your system, one of the AWS Regions in which you
operate over went down for 3 hours, and the failover worked correctly. However, after recovery,
users are experiencing strange bugs, in which users on different sides of the globe see different data.
What is a likely design issue that was not accounted for when launching?
A. The system did not include repair logic and request replay buffering logic for post-failure, to
re-synchronize data to the Region that was unavailable for a number of hours.
B. The system did not implement DynamoDB Table Defragmentation for restoring partition
performance in
the Region that experienced an outage, so data is served stale.
C. The system does not have Lambda Functor Repair Automatons, to perform table scans and chack
corrupted partition blocks inside the Table in the recovered Region.
D. The system did not use DynamoDB Consistent Read requests, so the requests in different areas are
not utilizing consensus across Regions at runtime.
Answer: A
When using multi-region DynamoDB systems, it is of paramount importance to make sure that all
requests made to one Region are replicated to the other. Under normal operation, the system in
would correctly perform write replays into the other Region. If a whole Region went down, the
would be unable to perform these writes for the period of downtime. Without buffering write
somehow, there would be no way for the system to replay dropped cross-region writes, and the
would be serviced differently depending on the Region from which they were served after recovery.

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