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NEW QUESTION # 203
A company's security engineer is designing an isolation procedure for Amazon EC2 instances as part of an incident response plan. The security engineer needs to isolate a target instance to block any traffic to and from the target instance, except for traffic from the company's forensics team. Each of the company's EC2 instances has its own dedicated security group. The EC2 instances are deployed in subnets of a VPC. A subnet can contain multiple instances.
The security engineer is testing the procedure for EC2 isolation and opens an SSH session to the target instance. The procedure starts to simulate access to the target instance by an attacker.
The security engineer removes the existing security group rules and adds security group rules to give the forensics team access to the target instance on port 22.
After these changes, the security engineer notices that the SSH connection is still active and usable. When the security engineer runs a ping command to the public IP address of the target instance, the ping command is blocked.
What should the security engineer do to isolate the target instance?
Answer: D
Explanation:
Amazon EC2 security groups are stateful, meaning that once a connection is established, return traffic is automatically allowed, even if the inbound rule that originally permitted the connection is later removed. According to the AWS Certified Security - Specialty Official Study Guide and Amazon EC2 security documentation, existing connections are not terminated when security group rules change. This explains why the SSH session remains active even after the security group rules were modified, while new traffic such as ICMP ping is blocked.
To immediately and fully isolate an EC2 instance during an incident response scenario, AWS recommends using stateless network controls. Amazon VPC network ACLs (NACLs) are stateless, which means that every packet is evaluated against the ACL rules regardless of whether the traffic is part of an existing connection. When a deny rule is added, all traffic is immediately blocked, including active sessions.
By creating a network ACL and associating it with the subnet that contains the target instance, and by adding explicit deny rules with the lowest rule numbers for both inbound and outbound traffic, the security engineer ensures that all network communication to and from the instance is immediately interrupted. This approach satisfies the requirement to isolate the instance while preserving its runtime state and memory for forensic analysis.
Other options fail to meet the requirement because security group modifications do not terminate existing sessions, Systems Manager does not enforce network isolation, and host-level firewall changes require instance-level access and do not provide immediate, network-enforced isolation.
NEW QUESTION # 204
A company is expanding its group of stores. On the day that each new store opens, the company wants to launch a customized web application for that store. Each store's application will have a non-production environment and a production environment. Each environment will be deployed in a separate AWS account. The company uses AWS Organizations and has an OU that is used only for these accounts.
The company distributes most of the development work to third-party development teams. A security engineer needs to ensure that each team follows the company's deployment plan for AWS resources. The security engineer also must limit access to the deployment plan to only the developers who need access. The security engineer already has created an AWS CloudFormation template that implements the deployment plan.
What should the security engineer do next to meet the requirements in the MOST secure way?
Answer: D
Explanation:
AWS Service Catalog is specifically designed to help organizations govern and control how AWS resources are provisioned at scale. According to the AWS Certified Security - Specialty Official Study Guide, Service Catalog enables administrators to define approved CloudFormation templates as products and to control which accounts, users, or organizational units can deploy those products.
By creating a Service Catalog portfolio in the management account and sharing it with a specific OU, the security engineer ensures that only accounts within that OU can deploy the approved infrastructure. Third-party developers can deploy resources only by using the predefined CloudFormation template and cannot alter the deployment plan, which enforces consistency and compliance.
This approach also limits access to the deployment plan itself, because developers interact with the Service Catalog product rather than the raw template. No cross-account IAM roles or excessive permissions are required, which reduces the attack surface.
NEW QUESTION # 205
A company is using Amazon EC2 instances to host an application in a private subnet in a VPC.
The application needs to use AWS KMS.
What is the MOST secure way for a security engineer to meet this requirement?
Answer: C
Explanation:
AWS KMS supports interface VPC endpoints powered by AWS PrivateLink. An interface endpoint gives resources in the VPC private IP connectivity to AWS KMS without requiring public IP addresses, an internet gateway, a NAT gateway, VPN, or Direct Connect. This is the most secure design because the EC2 instances remain in private subnets and KMS API traffic stays on the AWS private network path. A gateway endpoint is not available for AWS KMS; gateway endpoints are used for services such as Amazon S3 and DynamoDB. Moving instances to public subnets or routing through a NAT gateway is less secure because it introduces unnecessary internet egress architecture.
NEW QUESTION # 206
A company has security requirements for Amazon Aurora MySQL databases regarding encryption, deletion protection, public access, and audit logging. The company needs continuous monitoring and real-time visibility into compliance status. Which solution will meet these requirements?
Answer: B
Explanation:
AWS Config is the AWS service designed to continuously evaluate resource configurations against defined rules. According to the AWS Certified Security - Specialty Study Guide, AWS Config managed rules exist specifically to check database encryption, public accessibility, deletion protection, and log exports for Amazon RDS and Aurora.
AWS Config provides a real-time compliance timeline and displays the compliance state of each resource against each rule at any point in time. This granular visibility is required to assess ongoing compliance with security policies.
Audit Manager generates reports but does not provide continuous compliance monitoring.
Security Hub aggregates findings but does not track configuration drift. EventBridge and Lambda introduce unnecessary complexity.
NEW QUESTION # 207
A company is implementing new compliance requirements to meet customer needs. According to the new requirements, the company must not use any Amazon RDS DB instances or DB clusters that lack encryption of the underlying storage. The company needs a solution that will generate an email alert when an unencrypted DB instance or DB cluster is created. The solution also must terminate the unencrypted DB instance or DB cluster.
Which solution will meet these requirements in the MOST operationally efficient manner?
Answer: A
Explanation:
AWS Config provides managed rules that continuously evaluate resource configurations against compliance requirements. The AWS Certified Security - Specialty documentation highlights AWS Config managed rules as the preferred mechanism for enforcing configuration compliance at scale. The managed rule for encrypted RDS storage automatically detects DB instances and clusters that are created without encryption enabled.
By configuring automatic remediation, AWS Config can immediately invoke corrective actions without manual intervention. Integrating remediation with an Amazon SNS topic enables automated email notifications, while an AWS Lambda function can terminate the noncompliant resource. This creates a fully automated detect-alert-remediate workflow.
Option B requires manual remediation, which increases operational effort and delays enforcement. Options C and D rely on Amazon EventBridge, which evaluates events rather than configuration state and does not provide continuous compliance monitoring. AWS Config is explicitly designed for configuration compliance and governance use cases.
This solution aligns with AWS governance best practices by combining continuous monitoring, automated remediation, and centralized alerting with minimal operational overhead.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
AWS Config Managed Rules
AWS Config Automatic Remediation
NEW QUESTION # 208
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