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NEW QUESTION # 252
SIMULATION
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:
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)
Reference 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 # 253
An administrator has configured a quarantine subnet for all guest devices that connect to the network. Which of the following would be best for the security team to perform before allowing access to corporate resources?
Answer: A
NEW QUESTION # 254
Which of the following would enable a data center to remain operational through a multiday power outage?
Answer: C
Explanation:
The correct answer is A. Generator.
A generator can provide long-term backup power during an extended power outage, as long as sufficient fuel is available. For a multiday outage, a generator is the appropriate solution to keep a data center operational.
This aligns with CompTIA Security+ SY0-701 availability and resilience concepts. Data centers often use generators, redundant power feeds, UPS systems, and environmental controls to maintain uptime.
Why the other options are incorrect:
B). Uninterruptible power supply
A UPS provides short-term backup power and protects against brief outages, power fluctuations, and brownouts. It is usually designed to keep systems running until generator power starts or until systems can be shut down safely.
C). Replication
Replication copies data or systems to another location or system. It supports disaster recovery and availability, but it does not keep the same data center powered during an outage.
D). Parallel processing
Parallel processing distributes computing tasks across multiple processors or systems. It does not provide backup power.
Therefore, a generator is the best answer for a multiday power outage.
NEW QUESTION # 255
During a recent log review, an analyst found evidence of successful injection attacks. Which of the following will best address this issue?
Answer: A
Explanation:
Comprehensive and Detailed In-Depth Explanation:Input validationensures that only properly formatted and expected input is accepted by an application,preventing injection attacks such as SQL injection and command injection. Properly validating and sanitizing user inputs can mitigate these types of attacks.
* Authentication (A)helps verify user identity but does not prevent injection attacks.
* Secure cookies (B)protect session data but do not stop injection-based exploits.
* Static code analysis (C)can help identify vulnerabilities but does not activelypreventinjection attacks in real-time.
Implementingstrong input validationcanprevent malicious code from being executed, reducing the risk of injection attacks.
NEW QUESTION # 256
An attorney prints confidential documents to a copier in an office space near multiple workstations and a reception desk. When the attorney goes to the copier to retrieve the documents, the documents are missing. Which of the following would best prevent this from reoccurring?
Answer: B
Explanation:
LDAP authentication on the printer (C)would require users toauthenticate before printing, enablingsecure print release. This ensures that documents arenot printed until the authorized user is physically present, which directly addresses the issue of missing confidential documents.
As perCompTIA Security+ SY0-701, Domain 3.1 (Access management), integratingauthentication mechanisms like LDAPimproves physical and document security in shared environments.
NEW QUESTION # 257
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