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AWS-DevOps 受験トレーリング、AWS-DevOps-Engineer-Professional テスト問題集

 

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最近更新時間:2017-03-01
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AWS-DevOps-Engineer-Professional試験番号:AWS-DevOps-Engineer-Professional問題集
試験科目:AWS Certified DevOps Engineer - Professional
最近更新時間:2017-03-01
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NO.1 You need to grant a vendor access to your AWS account. They need to be able to read
protected
messages in a private S3 bucket at their leisure. They also use AWS. What is the best way to
accomplish
this?
A. Create a cross-account IAM Role with permission to access the bucket, and grant permission to use
the Role to the vendor AWS account.
B. Create an EC2 Instance Profile on your account. Grant the associated IAM role full access to the
bucket. Start an EC2 instance with this Profile and give SSH access to the instance to the vendor.
C. Create an IAM User with API Access Keys. Grant the User permissions to access the bucket. Give
the
vendor the AWS Access Key ID and AWS Secret Access Key for the User.
D. Generate a signed S3 PUT URL and a signed S3 PUT URL, both with wildcard values and 2 year
durations. Pass the URLs to the vendor.
Answer: A

AWS-DevOps-Engineer-Professional クエリ   
Explanation:
When third parties require access to your organization's AWS resources, you can use roles to
delegate
access to them. For example, a third party might provide a service for managing your AWS resources.
With IAM roles, you can grant these third parties access to your AWS resources without sharing your
AWS security credentials. Instead, the third party can access your AWS resources by assuming a role
that you create in your AWS account.
Reference:
http://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_common-scenarios_third-party.html

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 become an AWS IAM User.
C. Use of AWS STS Tokens to log in as a Google or Facebook user.
D. Use of an identity provider like Google or Facebook to exchange for temporary AWS security
credentials.
Answer: D

AWS-DevOps-Engineer-Professional 日本語   
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

NO.3 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 does not have Lambda Functor Repair Automatons, to perform table scans and chack
for
corrupted partition blocks inside the Table in the recovered Region.
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 did not implement DynamoDB Table Defragmentation for restoring partition
performance in
the Region that experienced an outage, so data is served stale.
Answer: B

AWS-DevOps-Engineer-Professional 再テスト   
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.4 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
attempt
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 5 EIPs per region and requested a 6th.
B. You didn't choose the Development version of the AMI you are using.
C. You hit the soft limit of 2 VPCs per region and requested a 3rd.
D. You didn't set the Development flag to true when deploying EC2 instances.
Answer: A

AWS-DevOps-Engineer-Professional 真実   
Explanation:
There is a soft limit of 5 EIPs per Region for VPC on new accounts. The third environment could not
allocate the 6th EIP.
Reference: http://docs.aws.amazon.com/general/latest/gr/aws_service_limits.html#limits_vpc