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NEW QUESTION # 231
A company runs an application on a fleet of Amazon EC2 instances. The company can remove instances from the fleet without risk to the application. All EC2 instances use the same security group named ProdFleet. Amazon GuardDuty and AWS Config are active in the company's AWS account.
A security engineer needs to provide a solution that will prevent an EC2 instance from sending outbound traffic if GuardDuty generates a cryptocurrency finding event. The security engineer creates a new security group named Isolate that contains no outbound rules. The security engineer configures an AWS Lambda function to remove an EC2 instance from the ProdFleet security group and add it to the Isolate security group.
Which additional step will meet this requirement?
Answer: B
Explanation:
Amazon GuardDuty generates security findings when it detects suspicious or malicious activity, including CryptoCurrency:EC2/* findings that indicate an EC2 instance may be involved in unauthorized cryptocurrency mining. According to AWS Certified Security - Specialty documentation, GuardDuty findings are published as events to Amazon EventBridge (formerly Amazon CloudWatch Events).
Amazon EventBridge is the recommended service for building automated incident response workflows. By creating an EventBridge rule that listens for GuardDuty findings of type CryptoCurrency:EC2/*, the security engineer can automatically invoke a Lambda function to isolate the affected EC2 instance by modifying its security group attachments.
NEW QUESTION # 232
A security engineer has designed a VPC to segment private traffic from public traffic. The VPC includes two Availability Zones. The security engineer has provisioned each Availability Zone with one private subnet and one public subnet. The security engineer has created three route tables for use with the environment. One route table is for the public subnets, and two route tables are for the private subnets (one route table for the private subnet in each Availability Zone).
The security engineer discovers that all four subnets are attempting to route traffic out through the internet gateway that is attached to the VPC.
Which combination of steps should the security engineer take to remediate this scenario? (Select TWO.)
Answer: B,D
Explanation:
In a properly segmented VPC architecture,public subnets route internet-bound traffic to an internet gateway, whileprivate subnets route outbound internet traffic through a NAT gatewaythat resides in a public subnet.
According to the AWS Certified Security - Specialty Official Study Guide and Amazon VPC documentation, private subnets must never have a direct route to an internet gateway.
The issue described indicates that private subnets are incorrectly routing traffic directly to the internet gateway. To remediate this, aNAT gateway must be provisioned in each public subnetto ensure high availability across Availability Zones. This satisfies the requirement that private resources can initiate outbound connections without being directly reachable from the internet.
Next, the route tables associated with theprivate subnets must be updatedso that the default route (0.0.0.0/0) points to the NAT gateway in the same Availability Zone. This ensures proper traffic flow and prevents cross- AZ dependencies.
Option B is incorrect because NAT gateways must reside in public subnets. Option C is unnecessary because local routes to the VPC CIDR range are automatically created. Option E is explicitly insecure, as it would reintroduce direct internet gateway access from private subnets.
AWS documentation consistently identifiesNAT gateways plus correct private subnet routingas the standard design for secure VPC segmentation.
* AWS Certified Security - Specialty Official Study Guide
* Amazon VPC Route Table Documentation
* AWS Well-Architected Framework - Security Pillar
NEW QUESTION # 233
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 arestateful, 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 usingstateless network controls. Amazon VPC network ACLs (NACLs) arestateless, 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 thatall 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.
* AWS Certified Security - Specialty Official Study Guide
* Amazon EC2 Security Groups Documentation
* Amazon VPC Network ACL Documentation
* AWS Incident Response Best Practices
NEW QUESTION # 234
A security engineer needs to implement a logging solution that captures detailed information about objects in an Amazon S3 bucket. The solution must include details such as the IAM identity that makes the request and the time the object was accessed. The data must be structured and available in near real time.
Which solution meets these requirements?
Answer: D
Explanation:
AWS CloudTrail data event logging is the correct solution because it is specifically designed to capture detailed, structured, and near-real-time API activity for Amazon S3 object-level operations. When S3 data events are enabled, CloudTrail records actions such as GetObject, PutObject, and DeleteObject, along with critical context including the IAM principal, source IP address, event time, request parameters, and response elements. These logs are delivered in JSON format, making them highly structured and suitable for security analysis, SIEM integration, and automated detection workflows.
NEW QUESTION # 235
A company uses SAML federation to grant users access to AWS accounts. A company workload that is in an isolated AWS account runs on immutable infrastructure with no human access to Amazon EC2. The company requires a specialized user known as a break-glass user to have access to the workload AWS account and instances in the case of SAML errors. A recent audit discovered that the company did not create the break-glass user for the AWS account that contains the workload.
The company must create the break-glass user. The company must log any activities of the break-glass user and send the logs to a security team.
Which combination of solutions will meet these requirements? (Choose Two.)
Answer: A,C
Explanation:
The break-glass account must work when SAML federation fails, so using another SAML- assumed role does not solve the outage scenario. A local, individual IAM user gives emergency access that can be attributed to a specific administrator. AWS Well-Architected guidance recommends establishing emergency access for cases where the centralized identity provider is unavailable. For EC2 instance access, Systems Manager Session Manager is the safer method because it avoids SSH keys and supports controlled, auditable access to managed instances.
CloudTrail, CloudWatch Logs, EventBridge, and SNS provide monitoring and notification of break-glass activity. EC2 key pairs and unrestricted security groups are poor security controls and create unmanaged, hard-to-audit access paths.
NEW QUESTION # 236
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