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試験科目:AWS Certified DevOps Engineer - Professional
問題と解答:全102問 AWS-DevOps-Engineer-Professional 認定試験トレーリング

>> AWS-DevOps-Engineer-Professional 認定試験トレーリング


NO.1 You run a clustered NoSQL database on AWS EC2 using AWS EBS. You need to reduce latency
database response times. Performance is the most important concern, not availability. You did not
perform the initial setup, someone without much AWS knowledge did, so you are not sure if they
configured everything optimally. Which of the following is NOT likely to be an issue contributing to
increased latency?
A. The EBS Volumes are not using PIOPS.
B. The database is not running in a placement group.
C. The EC2 instances are not EBS Optimized.
D. The database and requesting system are both in the wrong Availability Zone.
Answer: D

AWS-DevOps-Engineer-Professional 対応   AWS-DevOps-Engineer-Professional 割引   
For the highest possible performance, all instances in a clustered database like this one should be in a
single Availability Zone in a placement group, using EBS optimized instances, and using PIOPS SSD
EBS Volumes. The particular Availability Zone the system is running in should not be important, as
as it is the same as the requesting resources.

NO.2 Which of these techniques enables the fastest possible rollback times in the event of a failed
A. Rolling; Mutable
B. Blue-Green
C. Rolling; Immutable
D. Canary or A/B
Answer: B

AWS-DevOps-Engineer-Professional エンジン   
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.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 didn't choose the Development version of the AMI you are using.
B. You hit the soft limit of 2 VPCs per region and requested a 3rd.
C. You didn't set the Development flag to true when deploying EC2 instances.
D. You hit the soft limit of 5 EIPs per region and requested a 6th.
Answer: D

AWS-DevOps-Engineer-Professional 基礎   
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 implement DynamoDB Table Defragmentation for restoring partition
performance in
the Region that experienced an outage, so data is served stale.
B. 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.
C. The system did not use DynamoDB Consistent Read requests, so the requests in different areas are
not utilizing consensus across Regions at runtime.
D. 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.
Answer: B
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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