AWS-DevOps 問題集 - AWS Certified DevOps Engineer - Professional
NO.1 Which of these techniques enables the fastest possible rollback times in the event of a failed
deployment?
A. Rolling; Immutable
B. Canary or A/B
C. Rolling; Mutable
D. Blue-Green
Answer: D
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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
NO.2 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,
your
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 does not have Lambda Functor Repair Automatons, to perform table scans and chack
for
corrupted partition blocks inside the Table in the recovered Region.
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 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.
Answer: D
Explanation:
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
question
would correctly perform write replays into the other Region. If a whole Region went down, the
system
would be unable to perform these writes for the period of downtime. Without buffering write
requests
somehow, there would be no way for the system to replay dropped cross-region writes, and the
requests
would be serviced differently depending on the Region from which they were served after recovery.
Reference:
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Streams.CrossRegionRepl.ht
ml
NO.3 When thinking of AWS Elastic Beanstalk, which statement is true?
A. Worker tiers pull jobs from HTTP.
B. Worker tiers pull jobs from SQS.
C. Worker tiers pull jobs from SNS.
D. Worker tiers pull jobs from JSON.
Answer: B
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Explanation:
Elastic Beanstalk installs a daemon on each Amazon EC2 instance in the Auto Scaling group to process
Amazon SQS messages in the worker environment. The daemon pulls data off the Amazon SQS
queue,
inserts it into the message body of an HTTP POST request, and sends it to a user-configurable URL
path
on the local host. The content type for the message body within an HTTP POST request is
application/json by default.
Reference:
http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features-managing-env-tiers.html
NO.4 What is web identity federation?
A. Use of an identity provider like Google or Facebook to become an AWS IAM User.
B. Use of an identity provider like Google or Facebook to exchange for temporary AWS security
credentials.
C. Use of AWS IAM User tokens to log in as a Google or Facebook user.
D. Use of AWS STS Tokens to log in as a Google or Facebook user.
Answer: B
Explanation:
... users of your app can sign in using a well-known identity provider (IdP) -such as Login with
Amazon,
Facebook, Google, or any other OpenID Connect (OIDC)-compatible IdP, receive an authentication
token,
and then exchange that token for temporary security credentials in AWS that map to an IAM role
with
permissions to use the resources in your AWS account.
Reference: http://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_providers_oidc.html
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試験番号：AWS-DevOps問題集試験科目：AWS Certified DevOps Engineer - Professional
最近更新時間：2017-06-26
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