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NEW QUESTION # 927
A security analyst discovers an application written in C that does not properly validate the length of user input before copying it into a fixed-size array. To which of the following is the application vulnerable?
Answer: D
Explanation:
Failing to validate input length when copying data into a fixed-size array can overwrite adjacent memory, which is characteristic of a buffer overflow vulnerability.
NEW QUESTION # 928
Which of the following techniques would attract the attention of a malicious attacker in an insider threat scenario?
Answer: C
NEW QUESTION # 929
A security analyst is creating the first draft of a network diagram for the company's new customer-facing payment application that will be hosted by a third-party cloud service provider.

Answer:
Explanation:
See the Explanation for complete solution for this task.
Explanation:
A diagram of a computer AI-generated content may be incorrect.
Step 1: Understand Requirements & Security Principles
Requirements:
* Customer-facing payment application (PCI DSS compliance applies)
* Hosted on third-party cloud (e.g., AWS)
* Must segment public-facing and internal resources
* Needs to be scalable and resilient
* Must have strong security controls
Step 2: Design the High-Level Network Layout
Core Components:
* VPC (Virtual Private Cloud): Isolates your environment from other tenants in the cloud.
* Subnets:
* Public subnet: For resources that must communicate with the internet.
* Private subnet: For internal resources, NOT directly exposed to the internet.
Step 3: Place Resources in Appropriate Subnets
Public Subnet:
* Internet-facing Load Balancer (LB): Distributes traffic to application servers.
* Web Application Firewall (WAF): Protects against web exploits.
* Autoscaling Instances: EC2 (or VM) servers running your web front-end, automatically scaling as traffic grows.
Private Subnet:
* Application servers: Back-end logic, not exposed to internet directly.
* Database: Sensitive data storage, only accessible by application servers.
* Internal Load Balancer: Manages traffic among app servers.
* WAF: Can be used internally as well for defense-in-depth.
Step 4: Add Connectivity and Security Controls
* Internet Gateway: Allows resources in public subnet to communicate with the internet.
* NAT Gateway: Allows outbound internet traffic from private subnet without exposing private IPs.
* Security Groups: Firewalls at the instance level; allow only necessary traffic (e.g., LB to web server, web server to DB).
* Network ACLs: Subnet-level firewalls for additional control.
Step 5: Network Diagram Explanation (Based on Your Images)
Public Subnet (Top Layer)
* Load Balancer
* Accepts HTTPS traffic from customers.
* Sends only necessary HTTP/HTTPS to web servers in public subnet.
* WAF (Web Application Firewall)
* Sits in front of Load Balancer.
* Filters malicious requests (SQLi, XSS, etc.).
* Autoscaling Group
* Multiple web servers for redundancy and scalability.
* Placed in public subnet to respond to traffic spikes.
Private Subnet (Bottom Layer)
* Application Servers
* Receive requests from public subnet's load balancer.
* Not directly exposed to the internet.
* Database
* Only accessible from application servers, never public.
* Security groups restrict all inbound traffic except from app servers.
* Internal Load Balancer
* Balances requests to application servers.
Step 6: Flow of Data (Step-by-Step)
* Client -> Internet Gateway -> WAF -> Load Balancer (Public Subnet):Customers initiate connections to your app over the internet.
* Load Balancer -> Autoscaling Web Servers (Public Subnet):Load balancer routes requests to available web servers.
* Web Servers -> Application Logic (Private Subnet):Web servers pass necessary requests to the internal application servers.
* App Servers -> Database (Private Subnet):Application servers query/update customer payment data in the database.
* Outbound (NAT Gateway):App servers may need to access updates or external APIs-use NAT Gateway for secure outbound connections.
Step 7: Security Best Practices
* Security Groups: Only allow necessary ports (e.g., 443 for HTTPS to LB, 3306 for MySQL between app server and DB).
* Network ACLs: Add another layer of subnet-level restrictions.
* Encryption: Use HTTPS for all external connections, encrypt data at rest and in transit (TLS, disk encryption).
* IAM Roles/Policies: Principle of least privilege for accessing resources.
* Monitoring/Logging: Enable VPC flow logs, cloud service logs, and application logging.
* Patch Management: Automate patching for OS and applications.
* Backups: Regular, secure backups of critical data.
Step 8: Compliance Considerations
For payment applications (PCI DSS):
* Isolate cardholder data environment (CDE).
* Strong access controls (multi-factor authentication, role separation).
* Regular vulnerability assessments and penetration testing.
* Retain logs for auditing.
Step 9: Draw the Architecture (Summary)
* Internet Gateway: Allows inbound/outbound internet access.
* Public Subnet: WAF, Load Balancer, Autoscaling group.
* Private Subnet: App servers, DB, internal LB.
* NAT Gateway: Outbound access for private resources.
* Security Groups/ACLs: Control all traffic flows.
* Monitoring/Logging: Enabled at all levels.
Bonus: Sample Security Group Rules
Web Server (Public Subnet):
* Inbound: 443 (HTTPS) from Internet
* Outbound: 80/443 to App Servers
App Server (Private Subnet):
* Inbound: 80/443 from Web Servers
* Outbound: 3306 (MySQL) to Database
Database (Private Subnet):
* Inbound: 3306 from App Servers
* Outbound: None (unless replication required)
References to Security+ Domains
* 1.0 General Security Concepts: Principle of least privilege, defense in depth.
* 2.0 Threats, Vulnerabilities, Mitigations: WAF, segmentation, patching.
* 3.0 Security Architecture: Network segmentation, secure design.
* 4.0 Security Operations: Monitoring, logging, response.
* 5.0 Security Program Management: Compliance, policy.
NEW QUESTION # 930
A spoofed identity was detected for a digital certificate. Which of the following are the type of unidentified key and the certificate mat could be in use on the company domain?
Answer: A
Explanation:
A self-signed certificate is a certificate that is signed by its own private key rather than by a trusted certificate authority (CA). This means that the authenticity of the certificate relies solely on the issuer's own authority. If a spoofed identity was detected, it could indicate that a private key associated with a self-signed certificate was compromised. Self-signed certificates are often used internally within organizations, but they carry higher risks since they are not validated by a third-party CA, making them more susceptible to spoofing.
Reference = CompTIA Security+ SY0-701 study materials, particularly the domains discussing Public Key Infrastructure (PKI) and certificate management.
NEW QUESTION # 931
A security operations center determines that the malicious activity detected on a server is normal. Which of the following activities describes the act of ignoring detected activity in the future?
Answer: C
Explanation:
Explanation
Tuning is the activity of adjusting the configuration or parameters of a security tool or system to optimize its performance and reduce false positives or false negatives. Tuning can help to filter out the normal or benign activity that is detected by the security tool or system, and focus on the malicious or anomalous activity that requires further investigation or response. Tuning can also help to improve the efficiency and effectiveness of the security operations center by reducing the workload and alert fatigue of the analysts. Tuning is different from aggregating, which is the activity of collecting and combining data from multiple sources or sensors to provide a comprehensive view of the security posture. Tuning is also different from quarantining, which is the activity of isolating a potentially infected or compromised device or system from the rest of the network to prevent further damage or spread. Tuning is also different from archiving, which is the activity of storing and preserving historical data or records for future reference or compliance. The act of ignoring detected activity in the future that is deemed normal by the security operations center is an example of tuning, as it involves modifying the settings or rules of the security tool or system to exclude the activity from the detection scope.
Therefore, this is the best answer among the given options. References = Security Alerting and Monitoring Concepts and Tools - CompTIA Security+ SY0-701: 4.3, video at 7:00; CompTIA Security+ SY0-701 Certification Study Guide, page 191.
NEW QUESTION # 932
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