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NEW QUESTION # 124
A company runs a public web application on an Amazon EKS cluster. The company uses an Amazon CloudFront distribution to deploy the application. An Application Load Balancer (ALB) is configured as an origin for the distribution.
A security engineer needs to implement a monitoring solution that sends notifications to an existing Amazon SNS topic. The solution must send a notification to the SNS topic when the application receives 10,000 requests from the same end-user IP address during any 5-minute period.
Which solution will meet these requirements?
Answer: D
Explanation:
Comprehensive and Detailed 100to 150 words of Explanation From AWS Certified Security - Specialty topics:
AWS WAF rate-based rules are specifically designed to count requests by aggregation keys such as source IP address and apply an action when the count exceeds the configured limit during the evaluation window. A 5- minute window is the default and supported evaluation period. Because the application is delivered through CloudFront, the web ACL should be associated with the CloudFront distribution so requests are evaluated at the edge before reaching the ALB and EKS workload. CloudWatch metrics for the WAF rule can drive an alarm that notifies the SNS topic. CloudFront logs or VPC Flow Logs would require delayed log processing and custom counting. ASN matching does not count requests by individual end-user IP address.
NEW QUESTION # 125
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: B
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 # 126
A company runs a global ecommerce website using Amazon CloudFront. The company must block traffic from specific countries to comply with data regulations. Which solution will meet these requirements MOST cost-effectively?
Answer: B
Explanation:
Amazon CloudFront includes a built-in geo restriction feature that allows content to be allowed or denied based on the viewer's country. According to AWS Certified Security - Specialty documentation, CloudFront geo restriction is the most cost-effective method for country-based blocking because it does not require AWS WAF or additional rule processing.
AWS WAF geo match rules incur additional cost and are more appropriate when advanced inspection or layered security controls are required. IP-based blocking is impractical due to frequent IP changes. Geolocation headers do not enforce access control.
CloudFront geo restriction is evaluated at the edge and efficiently blocks disallowed countries with minimal latency and cost.
NEW QUESTION # 127
A company uses Amazon API Gateway to present REST APIs to users. An API developer wants to analyze API access patterns without the need to parse the log files.
Which combination of steps will meet these requirements with the LEAST effort? (Select TWO.)
Answer: A,E
Explanation:
To analyze API access patterns with minimal effort andwithout parsing raw log files, the best approach is to rely onmetricsand built-in query tooling. EnablingDetailed CloudWatch Metricsfor an API Gateway stage (Option E) provides near-real-time, aggregated visibility into usage and performance patterns (such as request counts, latency, error rates like 4XX/5XX) that are ideal for identifying trends and spikes without handling logs.
For deeper pattern exploration when needed,CloudWatch Logs Insights(Option D) provides an interactive query experience over logs that are already in CloudWatch Logs, allowing quick filtering and aggregation. In practice, developers use metrics to understand access patterns at a high level and Logs Insights to slice and dice request data without building a separate parsing pipeline.
Options A and C still rely on enabling access logs and shipping them to S3/Athena, which is more setup and operational overhead (and still involves managing log storage/format). CloudTrail (Option B) records control- plane API calls to AWS services, not end-user access requests to your API methods, so it won't provide the desired access pattern view for API consumers. Therefore, Detailed CloudWatch Metrics plus CloudWatch Logs Insights is the least-effort combination for access pattern analysis.
NEW QUESTION # 128
A company hosts its public website on Amazon EC2 instances behind an Application Load Balancer (ALB). The website is experiencing a global DDoS attack by a specific IoT device brand that has a unique user agent.
A security engineer is creating an AWS WAF web ACL and will associate the web ACL with the ALB. The security engineer must implement a rule statement as part of the web ACL to block the requests. The rule statement must mitigate the current attack and future attacks from these IoT devices without blocking requests from customers.
Which rule statement will meet these requirements?
Answer: A
Explanation:
AWS WAF allows security engineers to create string match rule statements that inspect specific parts of web requests, including HTTP headers such as the User-Agent header. According to the AWS Certified Security - Specialty Study Guide and AWS WAF documentation, string match rules are ideal for blocking requests that contain known malicious identifiers, such as a distinctive user agent associated with a specific bot or IoT device brand.
In this scenario, the attack originates from a specific IoT device brand that uses a unique user agent. A string match rule that inspects the User-Agent header can precisely block malicious requests while allowing legitimate customer traffic to continue uninterrupted. This approach provides targeted mitigation for both current and future attacks originating from the same device signature.
NEW QUESTION # 129
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