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NEW QUESTION # 121
A company wants to store all objects that contain sensitive data in an Amazon S3 bucket. The company will use server-side encryption to encrypt the S3 bucket. The company ' s operations team manages access to the company's S3 buckets. The company ' s security team manages access to encryption keys. The company wants to separate the duties of the two teams to ensure that configuration errors by only one of these teams will not compromise the data by granting unauthorized access to plaintext data.
Which solution will meet this requirement?
Answer: B
Explanation:
To achieve true separation of duties, the company needs a design whereS3 access alone is not sufficientto read plaintext data.SSE-KMS with a customer managed KMS keyprovides that separation because successful object reads require both: (1) S3 permissions to read the object and (2) permission to use the KMS key to decrypt it. This enables the operations team to manage bucket and object permissions while the security team independently controls key usage through theKMS key policy(and grants). If either team misconfigures only their part, the data is still protected: an overly permissive bucket policy won't expose plaintext unless KMS decrypt is also allowed; similarly, KMS permissions alone are not sufficient without S3 read access.
Option B also adds a bucket policy requirement enforcingSSE-KMSso objects are consistently protected with the customer managed key. SSE-S3 options (A and C) do not provide the same separation because S3 manages the keys and decryption is not independently controlled by a separate team via KMS policies. Option D is invalid because SSE-C uses customer-provided keys that are supplied with each request and are not stored
/managed in KMS as described. Therefore, SSE-KMS with customer managed keys plus restrictive key policy is the correct solution.
NEW QUESTION # 122
A security engineer receives a notice about suspicious activity from a Linux-based Amazon EC2 instance that uses Amazon Elastic Block Store (Amazon EBS)-based storage. The instance is making connections to known malicious addresses.
The instance is in a development account within a VPC that is in the us-east-1 Region. The VPC contains an internet gateway and has a subnet in us-east-1a and us-east-1b. Each subnet is associated with a route table that uses the internet gateway as a default route. Each subnet also uses the default network ACL. The suspicious EC2 instance runs within the us-east-1b subnet.
During an initial investigation, a security engineer discovers that the suspicious instance is the only instance that runs in the subnet.
Which response will immediately mitigate the attack and help investigate the root cause?
Answer: A
Explanation:
AWS incident response best practices emphasize immediate containment, preservation of evidence, and safe forensic investigation. According to the AWS Certified Security - Specialty Study Guide, when an EC2 instance is suspected of compromise, security teams should avoid logging in to the instance or installing additional tools, as these actions can alter evidence and increase risk.
Terminating the compromised instance after ensuring that its Amazon EBS volumes are preserved prevents further malicious activity immediately. By setting the EBS volumes to not delete on termination, all disk data is retained for forensic analysis. Launching a new, clean EC2 instance in a different subnet or Availability Zone with preinstalled diagnostic tools allows investigators to safely attach and analyze the compromised volumes without executing potentially malicious code.
Option A introduces significant risk by logging in to the compromised instance and modifying security controls during active compromise. Option B delays containment and allows continued outbound traffic during investigation steps. Option D is invalid because AWS WAF cannot be attached directly to Amazon EC2 instances and does not control outbound traffic.
AWS documentation strongly recommends isolating or terminating compromised resources and performing offline analysis using detached storage volumes. This approach ensures immediate mitigation, preserves forensic integrity, and aligns with AWS incident response frameworks.
NEW QUESTION # 123
A company runs a web application on a fleet of Amazon EC2 instances that are in an Auto Scaling group. The EC2 instances are in the same VPC subnet as other workloads.
A security engineer deploys an Amazon GuardDuty detector in the same AWS Region as the EC2 instances and integrates GuardDuty with AWS Security Hub.
The security engineer needs to implement an automated solution to detect and appropriately respond to anomalous traffic patterns for the web application. The solution must comply with AWS best practices for initial response to security incidentsand mustminimize disruptionto the web application.
Which solution will meet these requirements?
Answer: A
Explanation:
AWS incident response best practices emphasizerapid containment with minimal blast radius. According to the AWS Certified Security - Specialty Official Study Guide, isolating a compromised resource while allowing the application to continue running is the preferred initial response.
By using Amazon EventBridge to detect GuardDuty findings related to anomalous traffic and invoking a Lambda function, the security engineer can automatically remove the affected EC2 instance from the Auto Scaling group and attach arestricted security group. This immediately isolates the instance while allowing Auto Scaling to launch a replacement instance, ensuring application availability.
Option A is invalid because EC2 instance profiles do not use long-term access keys. Option C affects the entire subnet and could disrupt unrelated workloads. Option D provides notification only and does not meet the requirement for automated response.
AWS documentation explicitly recommendsinstance-level isolation using security groupsas a best practice for initial incident containment.
* AWS Certified Security - Specialty Official Study Guide
* Amazon GuardDuty User Guide
* AWS Incident Response Best Practices
NEW QUESTION # 124
A company is using AWS Organizations with nested OUs to manage AWS accounts. The company has a custom compliance monitoring service for the accounts. The monitoring service runs as an AWS Lambda function and is invoked by Amazon EventBridge Scheduler.
The company needs to deploy the monitoring service in all existing and future accounts in the organization.
The company must avoid using the organization's management account when the management account is not required.
Which solution will meet these requirements?
Answer: C
Explanation:
AWS Organizations and CloudFormation StackSets provide an organizational deployment mechanism for consistent infrastructure across accounts. AWS Certified Security - Specialty guidance emphasizes minimizing use of the management account and using delegated administrator capabilities where available for centralized governance while reducing blast radius. By configuring a delegated administrator account for AWS CloudFormation, the company can create and manage StackSets without performing day-to-day deployment operations from the management account. Targeting the organization root ensures the StackSet deploys to all existing accounts. Enabling automatic deployment ensures that any future accounts that join the organization (or move into targeted OUs, depending on configuration) automatically receive the monitoring service without manual intervention. This directly meets the requirement to deploy to all existing and future accounts with minimal effort. Option A requires ongoing manual updates when accounts are added, increasing operational overhead. Options C and D rely on Systems Manager Automation, which can work but introduces additional operational complexity and is not the standard AWS mechanism for organization-wide infrastructure rollout compared to StackSets with auto-deployment. StackSets also provide consistent change control, drift detection, and centralized update mechanisms, which align with governance expectations for compliance tooling.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
AWS Organizations Delegated Administration
AWS CloudFormation StackSets for Multi-Account Governance
NEW QUESTION # 125
A company has a single AWS account and uses an Amazon EC2 instance to test application code. The company recently discovered that the instance was compromised and was serving malware. Analysis showed that the instance was compromised 35 days ago. A security engineer must implement a continuous monitoring solution that automatically notifies the security team by email for high severity findings as soon as possible. Which combination of steps should the security engineer take to meet these requirements? (Select THREE.)
Answer: A,D,E
NEW QUESTION # 126
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