Pass the Amazon Web Services AWS Certified Specialty SCS-C03 Questions and answers with CertsForce

AWS WAF provides managed and custom rules that can immediately mitigate common web exploits such as SQL injection without modifying application code. According to AWS Certified Security – Specialty documentation, placing AWS WAF in front of an Application Load Balancer is a recommended rapid-response control for legacy applications with known vulnerabilities.

Creating an ALB in front of the existing EC2 instances allows seamless traffic migration. AWS WAF SQL injection rules can be deployed and tested without downtime. Updating Route 53 to point to the ALB preserves normal operations. Restricting EC2 security groups afterward prevents bypassing the WAF.

Option B introduces CloudFront changes and single-origin testing, increasing complexity. Option C cannot be completed within 24 hours and risks downtime. Option D is invalid because AWS WAF cannot be attached directly to EC2 instances.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

AWS WAF Web ACL Architecture

AWS Application Load Balancer Security

In IAM Identity Center, a permission set that includes acustomer managed policydoes not “carry” that policy into each target account automatically unless the policy exists there. When you attach a customer managed policy by name to a permission set, IAM Identity Center expects that policy to be present in each account where the permission set is provisioned. If the policy is missing in any account (common when assigning across multiple accounts), provisioning/assignment can fail because Identity Center cannot attach a non-existent policy to the role it creates in that account.

The correct fix is tocreate the customer managed policy in every target account, ensuring it has thesame nameand the intended permissions in each account. Once the policy exists consistently across accounts, IAM Identity Center can successfully provision the permission set in each account and complete the user assignment.

Options B and D are workarounds that increase complexity and do not address the underlying requirement to use the customer managed policy across accounts. Option C is not the issue here; policy “conflicts” typically do not prevent provisioning—missing referenced customer managed policies do. Therefore, ensuring the customer managed policy exists in each assigned account resolves the failure with the intended multi-account design.

AWS incident response best practices emphasize rapid containment to prevent further data exposure. According to the AWS Certified Security – Specialty Study Guide, the fastest and least disruptive containment method for compromised compute resources is to immediately revoke credentials and permissions rather than modifying data or infrastructure.

Revoking the IAM role’s active sessions prevents the EC2 instance from continuing to access AWS services. Updating the S3 bucket policy to explicitly deny access to the IAM role ensures immediate enforcement, even if temporary credentials remain cached. Removing the IAM role from the instance profile further prevents new credentials from being issued.

Option A and D involve large-scale data movement or re-encryption, which is time-consuming and operationally expensive. Option B relies on network-level controls that do not prevent access through private AWS endpoints.

AWS guidance explicitly recommends credential revocation and policy-based denial as the fastest containment step during active incidents.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

AWS Incident Response Best Practices

AWS IAM Role Session Management

Amazon S3 gateway endpoints supportendpoint policiesthat can restrict which S3 resources are accessible through the endpoint. According to AWS Certified Security – Specialty documentation, endpoint policies are evaluatedin addition to IAM policiesand are ideal for enforcingdata exfiltration controlswithout breaking legitimate workloads.

By updating the S3 gateway endpoint policy to require both aws:ResourceOrgId and aws:PrincipalOrgId to match the company’s AWS Organization, the security engineer ensures that EC2 instances can accessonly S3 buckets that belong to the organization. This immediately blocks exfiltration to external S3 buckets while allowing legitimate internal data access to continue uninterrupted.

Option B is insufficient because IAM policies alone cannot prevent access when the endpoint allows it. Option C would break all S3 access and stop the processing job. Option D applies too broadly and can impact unrelated services across the account.

AWS documentation highlightsS3 VPC endpoint policies with organization condition keysas a best practice for preventing S3 data exfiltration in private VPC environments.

AWS Certified Security – Specialty Official Study Guide

Amazon S3 VPC Endpoint Policy Documentation

AWS Organizations Condition Keys Documentation

CloudWatch Logs Insights is a managed, on-demand query capability designed to search and analyze log data stored in CloudWatch Logs without moving the data elsewhere. AWS Certified Security – Specialty documentation highlights Logs Insights as the lowest-effort method for rapid investigations, because it supports filtering, parsing, aggregation, and time-range queries directly over existing log groups. In this scenario, the logs already exist in CloudWatch Logs with sufficient retention. The engineer can write a query that filters for the suspicious IP address, counts occurrences over the last 7 days, and extracts requested URLs using parsing functions. This satisfies both requirements (count and URLs) immediately, without building pipelines or exporting data. Option B adds operational overhead by provisioning and maintaining OpenSearch ingestion and indexing. Options A and D require exporting data and additional services that are not necessary for a one-week forensic query. Therefore, Logs Insights is the most efficient and cost-effective approach.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

Amazon CloudWatch Logs Insights Querying and Investigation Workflows

The database islatency-sensitive, so the connectivity option should minimize jitter and provide more consistent performance than traversing the public internet.AWS Direct Connectprovides a dedicated network connection from the on-premises environment into AWS, typically delivering more stable throughput and lower/consistent latency characteristics compared with internet-based paths. However, Direct Connect by itself does not automatically provideIPsec encryption.

To satisfy the explicit requirement that traffic must haveIPsec encryption, the common AWS pattern is to run anAWS Site-to-Site VPN(IPsec tunnels) in conjunction with Direct Connect. This can be done as “VPN over Direct Connect” to encrypt the traffic while still taking advantage of Direct Connect’s private, predictable connectivity. This combination meets both requirements: improved latency characteristics (Direct Connect) and IPsec encryption (Site-to-Site VPN).

The other options do not fit. VPN CloudHub (Option C) is for connecting multiple remote sites together via AWS as a hub-and-spoke, not a primary low-latency private link. VPC peering (Option D) is only for VPC-to-VPC connectivity and does not connect to on-premises. NAT gateway (Option E) is for outbound internet/NAT translation and does not provide private encrypted connectivity to on-premises.

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

AWS Organizations and CloudFormation StackSets provide an organizational deployment mechanism for consistent infrastructure across accounts. AWS Certified Security – Specialty guidance emphasizes minimizing use of the management account and using delegated administrator capabilities where available for centralized governance while reducing blast radius. By configuring a delegated administrator account for AWS CloudFormation, the company can create and manage StackSets without performing day-to-day deployment operations from the management account. Targeting the organization root ensures the StackSet deploys to all existing accounts. Enabling automatic deployment ensures that any future accounts that join the organization (or move into targeted OUs, depending on configuration) automatically receive the monitoring service without manual intervention. This directly meets the requirement to deploy to all existing and future accounts with minimal effort. Option A requires ongoing manual updates when accounts are added, increasing operational overhead. Options C and D rely on Systems Manager Automation, which can work but introduces additional operational complexity and is not the standard AWS mechanism for organization-wide infrastructure rollout compared to StackSets with auto-deployment. StackSets also provide consistent change control, drift detection, and centralized update mechanisms, which align with governance expectations for compliance tooling.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

AWS Organizations Delegated Administration

AWS CloudFormation StackSets for Multi-Account Governance

Amazon GuardDuty Exfiltration:S3/AnomalousBehavior findings indicate that S3 data access patterns are consistent with data exfiltration. In this scenario, the attacker is usingtemporary credentials obtained from an EC2 instance profile, which are issued by AWS Security Token Service (STS).

According to AWS Certified Security – Specialty documentation, thefastest and most targeted remediationis to revoke the temporary session credentials associated with the compromised instance profile. This can be accomplished by removing or modifying the IAM role permissions, detaching the instance profile, or stopping the instance, which immediately invalidates the temporary credentials and prevents further S3 access.

Option B may limit outbound traffic but does not invalidate already issued credentials. Option C is a detection and classification service and does not prevent active exfiltration. Option D would block all access to the bucket, including legitimate access, and is considered overly disruptive for incident containment.

AWS incident response best practices emphasizecredential revocation as the first containment stepwhen compromise of temporary credentials is confirmed.

AWS Certified Security – Specialty Official Study Guide

Amazon GuardDuty User Guide – S3 Protection

AWS STS and IAM Role Security Documentation

AWS Incident Response Best Practices

AWS CloudTrail Lake is purpose-built to store, query, and analyze CloudTrail events, including data events, without requiring additional infrastructure. The AWS Certified Security – Specialty documentation explains that CloudTrail Lake provides immutable event storage with configurable retention periods, including multi-year retention, which satisfies long-term compliance requirements such as 7-year retention. Events are stored in an append-only, immutable format managed by AWS, reducing operational complexity.

CloudTrail Lake supports SQL-based queries for complex analysis directly against the event data, eliminating the need to export logs to other services for querying. Additionally, CloudTrail Lake includes built-in dashboards and integrations that enable visualization of event trends and patterns without standing up separate analytics or visualization platforms.

Option B is invalid because CloudTrail Event History only retains events for up to 90 days and does not support long-term retention or advanced querying. Option C introduces high operational overhead and cost by requiring persistent Amazon EMR clusters and additional services. Option D incurs ongoing ingestion, indexing, and storage costs for OpenSearch Service over a 7-year period, making it less cost-effective than CloudTrail Lake.

AWS documentation positions CloudTrail Lake as the most cost-effective and operationally efficient solution for long-term, queryable CloudTrail event storage and visualization.

Referenced AWS Specialty Documents:

AWS Certified Security – Specialty Official Study Guide

AWS CloudTrail Lake Architecture and Retention

AWS CloudTrail Data Events Overview