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問題 #94
A company uses Amazon EC2 instances to host frontend services behind an Application Load Balancer.
Amazon Elastic Block Store (Amazon EBS) volumes are attached to the EC2 instances. The company uses Amazon S3 buckets to store large files for images and music. The company has implemented a security architecture on AWS to prevent, identify, and isolate potential ransomware attacks. The company now wants to further reduce risk. A security engineer must develop a disaster recovery solution that can recover to normal operations if an attacker bypasses preventive and detective controls. The solution must meet an RPO of1 hour.
Which solution will meet these requirements?
答案：B
解題說明：
An RPO of1 hourmeans the company must be able to restore data with at most60 minutes of loss. Option A directly meets this by usingAWS Backupto takehourly backupsof both the compute layer (EC2) and the data layer (S3). AWS Backup provides centralized policy-based scheduling, retention, and (when configured) immutable protections such as Backup Vault Lock to help defend backups from tampering-important in ransomware recovery scenarios. Backing up the S3 buckets hourly also addresses recovery of critical objects such as images and music that users rely on.
In addition, recovery to "normal operations" is not only about data restoration; it also requires rapidly re- creating infrastructure reliably. UsingAWS CloudFormation templatesstored in aversion-controlled Git repositorysupports consistent, repeatable rebuilds of the ALB, EC2 fleet configuration, IAM roles, security groups, and related components. This infrastructure-as-code approach reduces human error under incident pressure and accelerates disaster recovery execution.
Option B fails the RPO because daily backups can lose up to 24 hours of data. Option C focuses on logging
/governance rather than backups and does not establish a 1-hour recovery point. Option D also fails the RPO (4-hour snapshots) and is reactive to a specific finding type rather than a comprehensive DR plan for EC2 and S3.
問題 #95
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?
答案：D
解題說明：
AWS WAF logs capturedetailed 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 acritical detection controlwhen 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 toAmazon Data Firehose, the company ensures that all future requests are centrally captured and delivered to a durable storage service such as Amazon S3.
UsingAmazon 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.
Option A is incorrect because VPC Flow Logs operate at the network layer and do not capture HTTP request paths. Option B is invalid because ALBs do not support CloudWatch agents. Option C is viable but introduces additional operational complexity and cost, making it less appropriate than the native WAF logging solution.
AWS documentation highlightsAWS WAF logging combined with Athenaas a best practice for forensic analysis and attacker identification.
* AWS Certified Security - Specialty Official Study Guide
* AWS WAF Logging Documentation
* Amazon Athena User Guide
* AWS Detection and Monitoring Best Practices
問題 #96
A security engineer for a company is investigating suspicious traffic on a web application in the AWS Cloud.
The web application is protected by an Application Load Balancer (ALB) behind an Amazon CloudFront distribution. There is an AWS WAF web ACL associated with the ALB. The company stores AWS WAF logs in an Amazon S3 bucket.
The engineer notices that all incoming requests in the AWS WAF logs originate from a small number of IP addresses that correspond to CloudFront edge locations. The security engineer must identify the source IP addresses of the clients that are initiating the suspicious requests.
Which solution will meet this requirement?
答案：C
解題說明：
When Amazon CloudFront is used in front of an Application Load Balancer, CloudFront becomes the immediate source of incoming requests to the ALB. As a result, AWS WAF logs record theCloudFront edge location IP addressesas the client IPs, not the original viewer IP addresses. This behavior is explicitly documented in the AWS Certified Security - Specialty Study Guide and the AWS WAF and CloudFront integration documentation.
To preserve the original client IP address, CloudFront automatically adds theX-Forwarded-For HTTP header, which contains the IP address of the originating client followed by any proxy addresses involved in forwarding the request. AWS WAF logs include this header, making it the authoritative source for identifying true client IP addresses when CloudFront is used.
Option A is incorrect because VPC Flow Logs capture network-level metadata and will only show CloudFront IP addresses, not the original client IPs. Option C is incorrect because disabling connection reuse does not change how client IPs are logged in AWS WAF. Option D is unnecessary and unsupported as a requirement because CloudFront already provides the required information through standard headers.
AWS documentation consistently states thatX-Forwarded-Foris the correct and supported mechanism for tracing client IPs in CloudFront-protected applications.
* AWS Certified Security - Specialty Official Study Guide
* AWS WAF Developer Guide - Logging
* Amazon CloudFront Developer Guide - Request Headers
問題 #97
A company is using AWS Organizations with the default SCP. The company needs to restrict AWS usage for all AWS accounts that are in a specific OU. Except for some desired global services, the AWS usage must occur only in theeu-west-1Region for all accounts in the OU. A security engineer must create an SCP that applies the restriction to existing accounts and any new accounts in the OU.
Which SCP will meet these requirements?
答案：B
解題說明：
To restrict activity to a single Region in an OU using an SCP, the standard pattern is an explicitDenyfor requests madeoutsidethe allowed Region, while carving out exceptions forglobal servicesthat do not use aws:
RequestedRegion in the same way (or that must remain usable regardless of Region). This is done withEffect:
Deny, aConditionusing StringNotEquals on aws:RequestedRegion for the allowed Region (here, eu-west-1), andNotActionlisting the global services that should remain available.
This works because SCPs act asguardrails: an explicit Deny in an SCP overrides IAM Allow in member accounts, ensuring the restriction applies consistently to all existing and future accounts placed in the OU. The StringNotEquals condition ensures the deny triggers for any Region other than eu-west-1. The NotAction exception list ensures that the specified global services are not blocked by this deny statement.
Option A is wrong because StringEquals would deny actionsineu-west-1 rather than outside it. Options B and D useAllowstatements, which do not enforce "only this Region" safely in SCPs unless combined with a comprehensive deny strategy; they would not reliably restrict all other services/regions. Therefore, option C is the correct SCP structure.
問題 #98
A company's application team wants to replace an internal application with a new AWS architecture that consists of Amazon EC2 instances, an AWS Lambda function, and an Amazon S3 bucket in a single AWS Region. After an architecture review, the security team mandates that no application network traffic can traverse the public internet at any point. The security team already has an SCP in place for the company's organization in AWS Organizations to restrict the creation of internet gateways, NAT gateways, and egress- only gateways.
Which combination of steps should the application team take to meet these requirements? (Select THREE.)
答案：B,D,F
解題說明：
Comprehensive and Detailed 100to 150 words of Explanation From AWS Certified Security - Specialty topics:
To keep application traffic off the public internet, EC2 and Lambda resources must reach S3 through private VPC networking. An S3 gateway endpoint provides private access from the VPC to S3 without using an internet gateway or NAT gateway. An S3 access point can also be restricted to VPC origin so S3 rejects requests that do not originate from the configured VPC path. The Lambda function must run inside the VPC so its S3 traffic can use the private endpoint path. Lambda "block public access" is not the relevant S3 network control. Security groups cannot target S3 gateway endpoints or S3 access points as destination resources in the way the distractors describe.
問題 #99
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