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SCS-C03 Practice Test Fee - SCS-C03 Free Study Material
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Amazon AWS Certified Security – Specialty Sample Questions (Q42-Q47):NEW QUESTION # 42
A company has a web application that reads from and writes to an Amazon S3 bucket. The company needs to use AWS credentials to authenticate all S3 API calls to the S3 bucket.
Which solution will provide the application with AWS credentials to make S3 API calls?
- A. Integrate with Cognito identity pools and use GetId to obtain AWS credentials.
- B. Integrate with Cognito user pools and use the access token to obtain AWS credentials.
- C. Integrate with Cognito identity pools and use AssumeRoleWithWebIdentity to obtain AWS credentials.
- D. Integrate with Cognito user pools and use the ID token to obtain AWS credentials.
Answer: C
Explanation:
Amazon Cognito identity pools are designed to provide temporary AWS credentials for applications by exchanging an authenticated identity token for AWS Security Token Service (STS) credentials. AWS Certified Security - Specialty guidance distinguishes between Cognito user pools (authentication) and identity pools (authorization to AWS resources). A user pool can authenticate a user and issue tokens, but an identity pool is required to obtain AWS credentials that can be used to sign AWS API requests, such as S3 API calls.
The correct mechanism is for the application to use AssumeRoleWithWebIdentity through STS (which is the underlying federation method used by identity pools) to receive temporary credentials for an IAM role that grants S3 permissions. GetId alone does not provide credentials; it returns an identity identifier that is used as part of the credential exchange flow. Options C and D are incorrect because user pool tokens are not AWS credentials and cannot directly sign S3 requests. The solution therefore must use identity pools to map users to IAM roles and retrieve temporary credentials, satisfying the requirement for authenticated API calls using short-lived credentials.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
Amazon Cognito Identity Pools and STS Federation
AWS STS AssumeRoleWithWebIdentity
NEW QUESTION # 43
A security team manages a company's AWS Key Management Service (AWS KMS) customer managed keys.
Only members of the security team can administer the KMS keys. The company's application team has a software process that needs temporary access to the keys occasionally. The security team needs to provide the application team's software process with access to the keys.
Which solution will meet these requirements with the LEAST operational overhead?
- A. Create a new KMS key by generating key material on premises. Import the key material to AWS KMS whenever the application team needs access. Grant the application team permissions to use the key.
- B. Export the KMS key material to an on-premises hardware security module (HSM). Give the application team access to the key material.
- C. Edit the key policy that grants the security team access to the KMS keys by adding the application team as principals. Revert this change when the application team no longer needs access.
- D. Create a key grant to allow the application team to use the KMS keys. Revoke the grant when the application team no longer needs access.
Answer: D
Explanation:
AWS KMS key grants are specifically designed to provide temporary, granular permissions to use customer managed keys without modifying key policies. According to the AWS Certified Security - Specialty Study Guide, grants are the preferred mechanism for delegating key usage permissions to AWS principals for short- term or programmatic access scenarios. Grants allow permissions such as Encrypt, Decrypt, or GenerateDataKey and can be created and revoked dynamically.
Using a key grant avoids the operational risk and overhead of editing key policies, which are long-term control mechanisms and should remain stable. AWS documentation emphasizes that frequent key policy changes increase the risk of misconfiguration and accidental privilege escalation. Grants can be revoked immediately when access is no longer required, ensuring strong adherence to the principle of least privilege.
Options A and D violate AWS security best practices because AWS KMS does not allow direct export of key material unless the key was explicitly created as an importable key, and exporting key material increases exposure risk. Option B requires manual policy changes and rollback, which introduces operational overhead and audit complexity.
AWS recommends key grants as the most efficient and secure way to provide temporary access to KMS keys for applications.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
AWS KMS Key Policies and Grants Documentation
AWS KMS Best Practices
NEW QUESTION # 44
A company has a VPC that has no internet access and has the private DNS hostnames option enabled. An Amazon Aurora database is running inside the VPC. A security engineer wants to use AWS Secrets Manager to automatically rotate the credentials for the Aurora database. The security engineer configures the Secrets Manager default AWS Lambda rotation function to run inside the same VPC that the Aurora database uses.
However, the security engineer determines that the password cannot be rotated properly because the Lambda function cannot communicate with the Secrets Manager endpoint.
What is the MOST secure way that the security engineer can give the Lambda function the ability to communicate with the Secrets Manager endpoint?
- A. Add a gateway VPC endpoint to the VPC to allow access to the Secrets Manager endpoint.
- B. Add an internet gateway for the VPC to allow access to the Secrets Manager endpoint.
- C. Add an interface VPC endpoint to the VPC to allow access to the Secrets Manager endpoint.
- D. Add a NAT gateway to the VPC to allow access to the Secrets Manager endpoint.
Answer: C
Explanation:
AWS Secrets Manager is a regional service that is accessed through private AWS endpoints. In a VPC without internet access, AWS recommends using AWS PrivateLink through interface VPC endpoints to enable secure, private connectivity to supported AWS services. According to AWS Certified Security - Specialty documentation, interface VPC endpoints allow resources within a VPC to communicate with AWS services without traversing the public internet, NAT devices, or internet gateways.
An interface VPC endpoint for Secrets Manager creates elastic network interfaces (ENIs) within the VPC subnets and assigns private IP addresses that route traffic directly to the Secrets Manager service. Because the VPC has private DNS enabled, the standard Secrets Manager DNS hostname resolves to the private IP addresses of the interface endpoint, allowing the Lambda rotation function to communicate securely and transparently.
Option A introduces unnecessary complexity and expands the attack surface by allowing outbound internet access. Option B is incorrect because gateway VPC endpoints are supported only for Amazon S3 and Amazon DynamoDB. Option D violates the security requirement by exposing the VPC to the internet.
AWS security best practices explicitly recommend interface VPC endpoints as the most secure connectivity method for private VPC workloads accessing AWS managed services.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
AWS Secrets Manager Security Architecture
AWS PrivateLink and Interface VPC Endpoints Documentation
NEW QUESTION # 45
A company's web application runs on Amazon EC2 instances behind an Application Load Balancer (ALB) in an Auto Scaling group. An AWS WAF web ACL is associated with the ALB. Instance logs are lost after reboots. The operations team suspects malicious activity targeting a specific PHP file.
Which set of actions will identify the suspect attacker's IP address for future occurrences?
- A. Install the CloudWatch agent on the ALB and export application logs.
- B. Export ALB access logs to Amazon OpenSearch Service and search them.
- C. Configure the web ACL to send logs to Amazon Kinesis Data Firehose. Deliver logs to Amazon S3 and query them with Amazon Athena.
- D. Configure VPC Flow Logs and search for PHP file activity.
Answer: C
Explanation:
AWS WAF logs contain detailed request-level information, including source IP addresses, requested URIs, and rule matches. According to AWS Certified Security - Specialty guidance, enabling AWS WAF logging provides the most reliable and tamper-resistant method to investigate web-based attacks, especially when instance-level logs are unavailable.
By streaming WAF logs through Amazon Kinesis Data Firehose to Amazon S3, the company ensures durable, centralized log storage that is independent of EC2 lifecycle events. Amazon Athena can then query the logs efficiently to identify repeated requests to the new-user-creation.php endpoint and extract attacker IP addresses.
VPC Flow Logs do not capture HTTP-level details. ALB access logs alone may not capture blocked requests.
WAF logs provide the best forensic visibility for future detection.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
AWS WAF Logging and Monitoring
Amazon Athena Log Analysis
NEW QUESTION # 46
A security engineer needs to control access to data that is encrypted with an AWS Key Management Service (AWS KMS) customer managed key. The security engineer also needs to use additional authenticated data (AAD) to prevent tampering with ciphertext.
Which solution will meet these requirements?
- A. Use IAM policies to restrict access to the Encrypt and Decrypt API actions.
- B. Use the kms:EncryptionContext condition key when defining IAM policies for the customer managed key.
- C. Use key policies to restrict access to the appropriate IAM groups.
- D. Pass the key alias to AWS KMS when calling the Encrypt and Decrypt API actions.
Answer: B
Explanation:
AWS KMS supports additional authenticated data (AAD) through the use of encryption context. According to the AWS Certified Security - Specialty documentation, encryption context is a set of key-value pairs that is cryptographically bound to the ciphertext. Any attempt to decrypt the data must include the same encryption context, or decryption will fail. This mechanism protects against ciphertext tampering and unauthorized reuse.
The kms:EncryptionContext condition key allows security engineers to enforce the use of specific encryption context values in IAM or key policies. By defining conditions that require particular encryption context attributes, access to encrypted data can be tightly controlled and bound to specific applications, environments, or workflows.
Option A does not provide integrity protection. Option B controls access but does not enforce the use of AAD. Option D restricts administrative access but does not address encryption context enforcement.
AWS documentation explicitly states that encryption context combined with policy conditions is the recommended method to implement authenticated encryption and fine-grained access control with KMS.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
AWS KMS Encryption Context
AWS KMS Policy Condition Keys
NEW QUESTION # 47
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