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NEW QUESTION: 1
In the Solaris 10 operating system, when only ordinary users can ftp to the network management server, which file should be modified so that the root user can also remote ftp to the server?
A. /etc/ftpusers
B. /etc/defaultrouter
C. /etc/services
D. /etc/system
Answer: A
NEW QUESTION: 2
マーケティング会社が統計分析のためにCSVファイルをAmazon S3バケットに保存しています。AmazonEC2インスタンスのアプリケーションには、S3バケットに保存されたCSVデータを効率的に処理するための権限が必要です。
EC2インスタンスにS3バケットへのアクセスを最も安全に許可するアクションはどれですか？
A. API呼び出しに使用するインスタンス上のアプリケーションのEC2インスタンスにAWS認証情報を直接保存します
B. IAMロールをEC2インスタンスプロファイルへの最小権限権限に関連付けます
C. S3バケットへの特定の権限を持つアプリケーションのIAMユーザーを作成します
D. リソースベースのポリシーをS3バケットにアタッチします
Answer: B
Explanation:
Keyword: Privilege Permission + IAM Role
AWS Identity and Access Management (IAM) enables you to manage access to AWS services and resources securely. Using IAM, you can create and manage AWS users and groups, and use permissions to allow and deny their access to AWS resources.
IAM is a feature of your AWS account offered at no additional charge. You will be charged only for use of other AWS services by your users.
IAM roles for Amazon EC2
Applications must sign their API requests with AWS credentials. Therefore, if you are an application developer, you need a strategy for managing credentials for your applications that run on EC2 instances. For example, you can securely distribute your AWS credentials to the instances, enabling the applications on those instances to use your credentials to sign requests, while protecting your credentials from other users. However, it's challenging to securely distribute credentials to each instance, especially those that AWS creates on your behalf, such as Spot Instances or instances in Auto Scaling groups. You must also be able to update the credentials on each instance when you rotate your AWS credentials.
We designed IAM roles so that your applications can securely make API requests from your instances, without requiring you to manage the security credentials that the applications use.
Instead of creating and distributing your AWS credentials, you can delegate permission to make API requests using IAM roles as follows:
* Create an IAM role.
* Define which accounts or AWS services can assume the role.
* Define which API actions and resources the application can use after assuming the role.
* Specify the role when you launch your instance, or attach the role to an existing instance.
* Have the application retrieve a set of temporary credentials and use them.
For example, you can use IAM roles to grant permissions to applications running on your instances that need to use a bucket in Amazon S3. You can specify permissions for IAM roles by creating a policy in JSON format. These are similar to the policies that you create for IAM users. If you change a role, the change is propagated to all instances.
When creating IAM roles, associate least privilege IAM policies that restrict access to the specific API calls the application requires.
IAM Roles
References:
https://aws.amazon.com/iam/faqs/
https://youtu.be/YQsK4MtsELU
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html
NEW QUESTION: 3
ある会社は、疎結合になるように強結合アプリケーションを設計しています。以前は、アプリケーションは要求/応答パターンを使用して層間で通信していました。同社は、Amazon Simple Queue Service（Amazon SQS）を使用してデカップリング要件を達成することを計画しています。初期設計には、要求用に1つ、応答用に1つのキューが含まれています。ただし、このアプローチでは、アプリケーションの拡張時にすべてのメッセージを処理するわけではありません。
この問題を解決するには、ソリューションアーキテクトは何をすべきですか？
A. FIFOキューを設定し、メッセージ重複排除IDとメッセージグループIDを使用します。
B. SQSキューのReceiveMessageAPIアクションでデッドレターキューを設定します。
C. 各応答メッセージを受信するための一時キュークライアントを使用して、一時キューを作成します。
D. 各プロデューサーの起動時に要求と応答ごとにキューを作成し、相関IDメッセージ属性を使用します。
Answer: B