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| Certification Vendor: | Amazon Web Services (AWS) |
|---|---|
| Exam Name: | AWS Certified Security - Specialty (SCS-C03) |
| Exam Number: | SCS-C03 |
| Exam Format: | Multiple choice, Multiple response |
| Certificate Validity Period: | 3 years |
| Available Languages: | English, Korean, Simplified Chinese, Japanese |
| Passing Score: | 750 (scaled score out of 1000) |
| Real Exam Qty: | 65 (multiple choice and multiple response) |
| Exam Price: | $300 USD |
| Exam Duration: | 170 minutes |
| Related Certifications: | AWS Certified DevOps Engineer - Professional AWS Certified Solutions Architect - Professional AWS Certified Advanced Networking - Specialty AWS Certified Solutions Architect - Associate AWS Certified SysOps Administrator - Associate |
| Recommended Training: | AWS Certified Security - Specialty Exam Prep AWS Skill Builder - Security Learning Path |
| Exam Registration: | AWS Certification Portal AWS Certification Official Registration |
| Sample Questions: | Amazon SCS-C03 Sample Questions |
| Exam Way: | Online proctored or testing center (onsite) |
| Pre Condition: | No mandatory prerequisite, but recommended experience: 5+ years in IT security and 2+ years securing AWS workloads |
| Official Syllabus URL: | https://aws.amazon.com/certification/certified-security-specialty/ |
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NEW QUESTION # 180
A company operates a web application that runs on Amazon EC2 instances. The application listens on port 80 and port 443. The company uses an Application Load Balancer (ALB) with AWS WAF to terminate SSL and to forward traffic to the application instances only on port 80.
The ALB is in public subnets that are associated with a network ACL named NACL1. The application instances are in dedicated private subnets that are associated with a network ACL named NACL2. An Amazon RDS for PostgreSQL DB instance that uses port 5432 is in a dedicated private subnet that is associated with a network ACL named NACL3. All the network ACLs currently allow all inbound and outbound traffic.
Which set of network ACL changes will increase the security of the application while ensuring functionality?
Answer: C
Explanation:
Network ACLs are stateless subnet-level controls, so both request traffic and return traffic must be explicitly allowed. The PostgreSQL database subnet should allow inbound TCP 5432 only from the application subnet CIDR blocks, not from the internet or unrelated subnets. Because return traffic from the database uses ephemeral destination ports on the client side, the outbound rule from the database subnet must allow TCP 1024-65536 back to the application instance subnets. Option A is invalid because network ACL rules use CIDR blocks, not other NACL names as sources or destinations. Options C and D modify only the application subnet NACL and fail to correctly restrict and allow database subnet return traffic.
NEW QUESTION # 181
A company with 50 AWS accounts managed through AWS Organizations needs to set up a centralized threat detection solution. The solution must identify suspicious and potentially malicious activity across all accounts in the organization.
The company uses AWS Control Tower and wants to centralize security findings into an audit account. A security team must receive email alerts within 5 minutes of any new security findings.
Which solution will meet these requirements?
Answer: A
Explanation:
Amazon GuardDuty is the AWS threat detection service designed to identify suspicious and potentially malicious activity across AWS accounts. In an AWS Organizations environment, the audit account can be configured as the delegated administrator so GuardDuty can be centrally managed across all member accounts. GuardDuty findings are also published to Amazon EventBridge in near real time, and EventBridge can route those findings to an Amazon SNS topic for email alerts, which satisfies the requirement for centralized detection and notifications within minutes.
NEW QUESTION # 182
A company manages multiple AWS accounts through an organization in AWS Organizations. The company enables all features in the organization.
A security team must implement a solution to centrally manage VPC security groups across the accounts. The company uses an existing reference security group with the required configuration. The solution must detect if security group rules have been modified to deviate from the reference security group. The solution must automatically restore any noncompliant security groups to match the reference security group.
The security team needs to select a solution that does not require custom development or scripting.
Which solution will meet these requirements?
Answer: D
Explanation:
Comprehensive and Detailed 100to 150 words of Explanation From AWS Certified Security - Specialty topics:
AWS Firewall Manager is the correct no-code centralized service for managing security groups across AWS Organizations. Firewall Manager security group policies can apply centrally controlled security group policies, audit rules, identify noncompliant security groups, and remediate deviations. AWS documentation states that Firewall Manager continuously maintains policies and applies them to accounts and resources as they are added or updated across the organization. It also supports common security group policies that replicate primary security groups and keep replicas synchronized with the primary. Systems Manager Automation or custom AWS Config remediation would require custom logic. CloudFormation StackSets can deploy initial security groups, but it does not continuously detect and automatically restore out-of-band rule changes in the required governance model.
NEW QUESTION # 183
Hotspot Question
A security engineer needs to prepare for a security audit of an AWS account.
Select the correct AWS resource from the following list to meet each requirement. Select each resource one time or not at all. (Select THREE.)
Answer:
Explanation:
NEW QUESTION # 184
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: D
Explanation:
Amazon EC2 security groups are stateful, 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 using stateless network controls. Amazon VPC network ACLs (NACLs) are stateless, 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 that all 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.
NEW QUESTION # 185
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