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NEW QUESTION # 52
A company wants to establish separate AWS Key Management Service (AWS KMS) keys to use for different AWS services. The company's security engineer created a key policy to allow the infrastructure deployment team to create encrypted Amazon Elastic Block Store (Amazon EBS) volumes by assuming the InfrastructureDeployment IAM role. The security engineer recently discovered that IAM roles other than the InfrastructureDeployment role used this key for other services.
Which change to the policy should the security engineer make to resolve these issues?
Answer: B
Explanation:
AWS KMS key policies can restrict how and where a key is used by leveraging condition keys such as kms:
ViaService. According to the AWS Certified Security - Specialty documentation, kms:ViaService limits key usage to requests that originate from a specific AWS service in a specific Region. If this condition is overly broad or incorrect, other IAM roles and services may unintentionally use the key.
By explicitly setting the kms:ViaService condition value to ec2.us-east-1.amazonaws.com, the key policy ensures that the KMS key can only be used when requests are made through the Amazon EC2 service in that Region, such as for EBS volume encryption. This prevents other services or unintended IAM roles from using the key.
Option A weakens the condition logic and can broaden access. Option B removes essential permissions that allow IAM policies to function with KMS keys and is not recommended. Option D relates to administrative control of the key, not service-level usage restrictions.
AWS best practices recommend using kms:ViaService and precise condition values to enforce service- specific key usage and strong separation of duties.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
AWS KMS Key Policy Condition Keys
AWS KMS Best Practices
NEW QUESTION # 53
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, while private subnets route outbound internet traffic through a NAT gateway that 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, a NAT gateway must be provisioned in each public subnet to 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 the private subnets must be updated so 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.
NEW QUESTION # 54
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.
Blocking both countries with a geo match rule (Option B) would likely block legitimate users located in those countries, which violates the requirement. Security groups (Options C and D) cannot natively enforcegeographicfiltering, and they are not well suited for large, rapidly changing sets of public source IPs at the application layer. Additionally, WAF operates at layer 7 with richer matching (rate limiting, URI/header patterns, bot controls), which is the appropriate control point when the ALB already has a web ACL associated. Therefore, implementing an AWS WAFrate-basedrule is the most effective and least disruptive immediate mitigation.
NEW QUESTION # 55
A public subnet contains two Amazon EC2 instances. The subnet has a custom network ACL. A security engineer is designing a solution to improve the subnet security.
The solution must allow outbound traffic to an internet service that uses TLS through port 443.
The solution also must deny inbound traffic that is destined for MySQL port 3306.
Which network ACL rule set meets these requirements?
Answer: D
Explanation:
In a network ACL, rules are processed in order, so the numbering of the rules is important. The solution requires:
Outbound traffic on port 443 (TLS) to reach an internet service.
Inbound traffic on port 3306 (MySQL) to be denied.
The correct rule set:
Inbound rule 100 denies traffic on TCP port 3306 to block MySQL access. Inbound rule 200 allows TCP port range 1024-65535, which is required for ephemeral ports used in response to outbound connections on port 443.
Outbound rule 100 allows TCP port 443, permitting the required outbound traffic. This configuration meets the requirements by ensuring that only traffic initiated outbound on port 443 can receive responses on ephemeral ports, and inbound MySQL traffic on port 3306 is denied.
NEW QUESTION # 56
A company is running a dynamic website by using an Application Load Balancer (ALB). A security engineer notices that bots from different IP addresses are using brute-force attacks to invoke a service endpoint frequently.
What is the FASTEST way to mitigate this problem?
Answer: A
Explanation:
Comprehensive and Detailed 100to 150 words of Explanation From AWS Certified Security - Specialty topics:
AWS WAF rate-based rules are the fastest native mitigation for high-frequency bot or brute-force request patterns against an ALB. A rate-based rule counts requests by aggregation key, commonly source IP address, during an evaluation window and can block clients that exceed the configured threshold. Creating the rule directly in a web ACL associated with the ALB is faster and cleaner than building custom Lambda log- processing logic. ALB listener rules can match known source IPs and paths, but they do not provide automatic rate tracking for distributed brute-force behavior. Creating a reusable rule group is possible, but it adds unnecessary setup when the immediate requirement is fastest mitigation.
NEW QUESTION # 57
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