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NEW QUESTION # 168
A company has a web-based application that runs behind an Application Load Balancer (ALB). The application is experiencing a credential stuffing attack that is producing many failed login attempts. The attack is coming from many IP addresses. The login attempts are using a user agent string of a known mobile device emulator. A security engineer needs to implement a solution to mitigate the credential stuffing attack.
The solution must still allow legitimate logins to the application.
Which solution will meet these requirements?
Answer: A
Explanation:
A credential stuffing attack at the ALB is aLayer 7problem and is best mitigated withAWS WAF. The attacker is distributed across many IPs, so blocking by IP in a security group (Option B) is ineffective and operationally heavy. A CloudWatch alarm (Option A) only alerts; it does not block or mitigate requests.
Because the malicious traffic uses a distinctive, knownUser-Agentstring associated with a mobile device emulator, AWS WAF can quickly reduce the attack by inspecting the User-Agent header and blocking matching requests. This approach is targeted: it blocks the identified automated attack pattern while allowing legitimate users who do not present that emulator User-Agent to continue logging in. The WAF rule can be deployed immediately on the existing ALB-associated web ACL and can be further refined (for example, applied only to /login paths, combined with rate-based rules, or integrated with Bot Control) to minimize false positives.
Option D is risky because "allow only legitimate user agents" is brittle: user agents are diverse and change frequently, and a strict allow-list can accidentally block real users. Therefore, a WAF custom block rule for the known malicious User-Agent string is the correct solution.
NEW QUESTION # 169
A security engineer is designing a solution that will provide end-to-end encryption between clients and Docker containers running in Amazon Elastic Container Service (Amazon ECS). This solution must also handle volatile traffic patterns. Which solution would have the MOST scalability and LOWEST latency?
Answer: C
Explanation:
Network Load Balancers operate at Layer 4 and are optimized for extreme performance, ultra-low latency, and handling sudden traffic spikes. According to AWS Certified Security - Specialty documentation, using a TCP listener on an NLB allows TLS traffic to pass through directly to backend containers without termination, preserving true end-to-end encryption.
This approach eliminates the overhead of decrypting and re-encrypting traffic at the load balancer, reducing latency and maximizing throughput. NLBs scale automatically to handle volatile traffic patterns and millions of requests per second.
Application Load Balancers operate at Layer 7 and introduce additional latency due to TLS termination and HTTP processing. Route 53 multivalue routing does not provide load balancing at the transport layer and does not ensure encryption handling.
AWS recommends NLB TCP pass-through for high-performance, end-to-end encrypted container workloads.
NEW QUESTION # 170
A company wants to improve the remediation of specific security incidents. Currently, a security engineer performs network isolation manually if traffic from Amazon EC2 instances to known command and control servers is detected. The manual network isolation process is error prone.
The security engineer must automate the process.
The security engineer enables Amazon GuardDuty. The security engineer configures instances to be managed by AWS Systems Manager. The security engineer prepares a Systems Manager Automation document to change security groups on selected instances.
Which solution will meet these requirements?
Answer: B
Explanation:
GuardDuty publishes findings to EventBridge, which can trigger automated incident workflows.
Systems Manager OpsCenter centralizes operational items and integrates with EventBridge, allowing GuardDuty findings to be transformed into OpsItems and linked with Systems Manager Automation runbooks for remediation. Since the company already has Systems Manager managed instances and an Automation document that changes security groups, routing GuardDuty command-and-control findings through EventBridge to OpsCenter is the cleanest automated remediation path. Amazon Detective supports investigation, not remediation execution. AWS Config evaluates configuration compliance, not live network behavior to known C2 destinations. Security Hub CSPM aggregates and normalizes security findings, but NIST control scans do not directly detect GuardDuty C2 traffic or automatically run the prepared isolation document.
NEW QUESTION # 171
A company's web application is hosted on Amazon EC2 instances running behind an Application Load Balancer (ALB) in an Auto Scaling group. An AWS WAF web ACL is associated with the ALB. AWS CloudTrail is enabled and stores logs in Amazon S3 and Amazon CloudWatch Logs.
The operations team has observed some EC2 instances reboot at random. After rebooting, all access logs on the instances have been deleted. During an investigation, the operations team found that each reboot happened just after a PHP error occurred on the new-user-creation.php file. The operations team needs to view log information to determine if the company is being attacked.
Which set of actions will identify the suspect attacker's IP address for future occurrences?
Answer: D
Explanation:
AWS WAF logs capture detailed request-level information, including source IP address, request URI, headers, and rule evaluation results. According to the AWS Certified Security - Specialty documentation, AWS WAF logging is a critical detection control when application-level attacks are suspected, especially when host-based logs are unreliable or can be erased by attackers.
By configuring the AWS WAF web ACL to send logs to Amazon Data Firehose, the company ensures that all future requests are centrally captured and delivered to a durable storage service such as Amazon S3. Using Amazon Athena, the security team can query these logs to identify requests targeting specific application paths such as new-user-creation.php and extract the originating client IP addresses.
NEW QUESTION # 172
A company runs an application on a fleet of Amazon EC2 instances. The application is accessible to users around the world. The company associates an AWS WAF web ACL with an Application Load Balancer (ALB) that routes traffic to the EC2 instances.
A security engineer is investigating a sudden increase in traffic to the application. The security engineer discovers a significant amount of potentially malicious requests coming from hundreds of IP addresses in two countries. The security engineer wants to quickly limit the potentially malicious requests. The security engineer does not want to prevent legitimate users from accessing the application.
Which solution will meet these requirements?
Answer: C
Explanation:
A rate-based rule in AWS WAF is designed to quickly mitigate spikes and potential layer 7 floods bytracking request rates per originating IPand temporarily blocking (or counting/challenging, depending on configuration) IPs that exceed a defined threshold within a 5-minute rolling window.
In this scenario, the malicious traffic is distributed acrosshundreds of IPsin two countries, and the application still needs to remain available globally for legitimate users. A rate-based rule provides fast, targeted throttling that reduces abusive request patterns without permanently blocking entire geographies. This aligns with "quickly limit" while minimizing collateral impact.
NEW QUESTION # 173
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