Selected SCS-C02 AWS Certified Specialty Questions Answers

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Question 16

A company uses a third-party application to store encrypted data in Amazon S3. The company uses another third-party application trial decrypts the data from Amazon S3 to ensure separation of duties Between the applications A Security Engineer warns to separate the permissions using IAM roles attached to Amazon EC2 instances. The company prefers to use native IAM services.

Which encryption method will meet these requirements?

Options:

Use encrypted Amazon EBS volumes with Amazon default keys (IAM EBS)

Use server-side encryption with customer-provided keys (SSE-C)

Use server-side encryption with IAM KMS managed keys (SSE-KMS)

Use server-side encryption with Amazon S3 managed keys (SSE-S3)

Question 17

A company's security team is building a solution for logging and visualization. The solution will assist the company with the large variety and velocity of data that it receives from IAM across multiple accounts. The security team has enabled IAM CloudTrail and VPC Flow Logs in all of its accounts. In addition, the company has an organization in IAM Organizations and has an IAM Security Hub master account.

The security team wants to use Amazon Detective However the security team cannot enable Detective and is unsure why

What must the security team do to enable Detective?

Options:

Enable Amazon Macie so that Secunty H jb will allow Detective to process findings from Macie.

Disable IAM Key Management Service (IAM KMS) encryption on CtoudTrail logs in every member account of the organization

Enable Amazon GuardDuty on all member accounts Try to enable Detective in 48 hours

Ensure that the principal that launches Detective has the organizations ListAccounts permission

Question 18

A company has a batch-processing system that uses Amazon S3, Amazon EC2, and AWS Key Management Service (AWS KMS). The system uses two AWS accounts: Account A and Account B.

Account A hosts an S3 bucket that stores the objects that will be processed. The S3 bucket also stores the results of the processing. All the S3 bucket objects are encrypted by a KMS key that is managed in

Account A.

Account B hosts a VPC that has a fleet of EC2 instances that access the S3 buck-et in Account A by using statements in the bucket policy. The VPC was created with DNS hostnames enabled and DNS resolution enabled.

A security engineer needs to update the design of the system without changing any of the system's code. No AWS API calls from the batch-processing EC2 in-stances can travel over the internet.

Which combination of steps will meet these requirements? (Select TWO.)

Options:

In the Account B VPC, create a gateway VPC endpoint for Amazon S3. For the gateway VPC endpoint, create a resource policy that allows the s3:GetObject, s3:ListBucket, s3:PutObject, and s3:PutObjectAcl actions for the S3 bucket.

In the Account B VPC, create an interface VPC endpoint for Amazon S3. For the interface VPC endpoint, create a resource policy that allows the s3:GetObject, s3:ListBucket, s3:PutObject, and s3:PutObjectAcl actions for the S3 bucket.

In the Account B VPC, create an interface VPC endpoint for AWS KMS. For the interface VPC endpoint, create a resource policy that allows the kms:Encrypt, kms:Decrypt, and kms:GenerateDataKey actions for the KMS key. Ensure that private DNS is turned on for the endpoint.

In the Account B VPC, verify that the S3 bucket policy allows the s3:PutObjectAcl action for cross-account use. In the Account B VPC, create a gateway VPC endpoint for Amazon S3. For the gateway VPC endpoint, create a resource policy that allows the s3:GetObject, s3:ListBucket, and s3:PutObject actions for the S3 bucket.

Question 19

A security engineer is configuring account-based access control (ABAC) to allow only specific principals to put objects into an Amazon S3 bucket. The principals already have access to Amazon S3.

The security engineer needs to configure a bucket policy that allows principals to put objects into the S3 bucket only if the value of the Team tag on the object matches the value of the Team tag that is associated with the principal. During testing, the security engineer notices that a principal can still put objects into the S3 bucket when the tag values do not match.

Which combination of factors are causing the PutObject operation to succeed when the tag values are different? (Select TWO.)

Options:

The principal's identity-based policy grants access to put objects into the S3 bucket with no conditions.

The principal's identity-based policy overrides the condition because the identity-based policy contains an explicit allow.

The S3 bucket's resource policy does not deny access to put objects.

The S3 bucket's resource policy cannot allow actions to the principal.

The bucket policy does not apply to principals in the same zone of trust.

Answer:

A, B

Explanation:

The correct answer is A and B. The principal’s identity-based policy grants access to put objects into the S3 bucket with no conditions, and the principal’s identity-based policy overrides the condition because the identity-based policy contains an explicit allow.

The reason is that when evaluating access requests, AWS uses a combination of resource-based policies (such as bucket policies) and identity-based policies (such as IAM user policies) to determine whether to allow or deny the action. According to the AWS documentation1, “If an explicit allow exists in either the resource-based policy or the identity-based policy, then AWS allows access to the resource.” Therefore, even if the bucket policy has a condition that checks the tag values, it will not be effective if the principal’s identity-based policy has an explicit allow for the PutObject action without any conditions. The explicit allow in the identity-based policy will override the condition in the bucket policy and grant access to the principal.

The other options are incorrect because:

C. The S3 bucket’s resource policy does not deny access to put objects. This is not a factor that causes the PutObject operation to succeed when the tag values are different. The bucket policy can either allow or deny access based on conditions, but it cannot prevent an explicit allow in the identity-based policy from taking effect.
D. The S3 bucket’s resource policy cannot allow actions to the principal. This is not true. The bucket policy can allow actions to specific principals by using the Principal element in the policy statement. According to the AWS documentation2, “The Principal element specifies the user (IAM user, federated user, or assumed-role user), AWS account, AWS service, or other principal entity that is allowed or denied access to a resource.”
E. The bucket policy does not apply to principals in the same zone of trust. This is not true. The bucket policy applies to any principal that is specified in the Principal element, regardless of whether they are in the same zone of trust or not. A zone of trust is a logical boundary that defines who can access a resource and under what conditions. According to the AWS documentation3, “A zone of trust can be as small as a single resource (for example, an Amazon S3 object) or as large as an entire AWS account.”

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