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NEW QUESTION # 24
Within a SCADA a business needs access to the historian server in order together metric about the functionality of the environment. Which of the following actions should be taken to address this requirement?
Answer: D
Explanation:
The best action to address the requirement of accessing the historian server within a SCADA system is to isolate the historian server for connections only from the SCADA environment. Here's why:
* Security and Isolation: Isolating the historian server ensures that only authorized devices within the SCADA environment can connect to it. This minimizes the attack surface and protects sensitive data from unauthorized access.
* Access Control: By restricting access to the historian server to only SCADA devices, the organization can better control and monitor interactions, ensuring that only legitimate queries and data retrievals occur.
* Best Practices for Critical Infrastructure: Following the principle of least privilege, isolating critical components like the historian server is a standard practice in securing SCADA systems, reducing the risk of cyberattacks.
* References:
* CompTIA Security+ SY0-601 Study Guide by Mike Chapple and David Seidl
* NIST Special Publication 800-82: Guide to Industrial Control Systems (ICS) Security
* ISA/IEC 62443 Standards: Security for Industrial Automation and Control Systems
NEW QUESTION # 25
A network security architect is working on capturing network traffic to support the following objectives in the pictured network:
- Capture relevant traffic to share with a threat intelligence vendor.
- Collect only traffic that could indicate a potential network
intrusion.
- Minimize the budget and resource requirements of the collected
traffic.
Which of the following is the best way for the network security architect to capture network traffic?
Answer: B
Explanation:
Configuring a SPAN (port mirroring) session on the core switch allows the architect to mirror selected network traffic to the IDS service for monitoring and analysis. This approach enables capturing only specific traffic flows relevant to potential intrusion activity by filtering VLANs or interfaces, which reduces the volume of collected data. SPAN functionality is built into most switches, making it a cost-effective solution that minimizes additional hardware and operational resources while still providing visibility into traffic that could indicate network attacks.
NEW QUESTION # 26
A security engineer discovers that some legacy systems are still in use or were not properly decommissioned.
After further investigation, the engineer identifies that an unknown and potentially malicious server is also sending emails on behalf of the company. The security engineer extracts the following data for review:
Which of the following actions should the security engineer take next? (Select two).
Answer: D,F
Explanation:
The presence of an unauthorized server (29mail.mycrosoft.info) sending emails on behalf of the company indicates a potential spoofing or phishing attempt. To mitigate this:
* Remove the unnecessary servers from the SPF record (Option C): The Sender Policy Framework (SPF) specifies which mail servers are authorized to send emails on behalf of a domain. Removing unauthorized or unnecessary servers from the SPF record helps prevent spoofed emails from passing SPF checks.
* Change the SPF record to enforce the hard fail parameter (Option D): Setting the SPF policy to a hard fail (-all) ensures that emails from unauthorized servers are rejected, enhancing email security.
Implementing these changes strengthens the domain's email authentication mechanisms, reducing the risk of successful phishing or spoofing attacks.
Reference: CompTIA SecurityX CAS-005 Exam Objectives, Domain 3.2: "Given a scenario, analyze requirements to enhance the security of endpoints and servers."
NEW QUESTION # 27
A security team is responding to malicious activity and needs to determine the scope of impact the malicious activity appears to affect certain version of an application used by the organization Which of the following actions best enables the team to determine the scope of Impact?
Answer: B
Explanation:
Reviewing the asset inventory allows the security team to identify all instances of the affected application versions within the organization. By knowing which systems are running the vulnerable versions, the team can assess the full scope of the impact, determine which systems might be compromised, and prioritize them for further investigation and remediation.
Performing a port scan (Option A) might help identify open ports but does not provide specific information about the application versions. Inspecting egress network traffic (Option B) and analyzing user behavior (Option D) are important steps in the incident response process but do not directly identify which versions of the application are affected.
Reference:
CompTIA Security+ Study Guide
NIST SP 800-61 Rev. 2, "Computer Security Incident Handling Guide"
CIS Controls, "Control 1: Inventory and Control of Hardware Assets" and "Control 2: Inventory and Control of Software Assets"
NEW QUESTION # 28
A security analyst is reviewing the following event timeline from an COR solution:
Which of the following most likely has occurred and needs to be fixed?
Answer: D
Explanation:
The event timeline indicates a sequence where a file (hr-reporting.docx) was saved, scanned, executed, and eventually found to contain malware. The critical issue here is that the malware scan completed after the file was already executed. This suggests a Time-Of-Check to Time-Of-Use (TOCTOU) vulnerability, where the state of the file changed between the time it was checked and the time it was used.
References:
* CompTIA SecurityX Study Guide: Discusses TOCTOU vulnerabilities as a timing attack where the state of a resource changes after it has been validated.
* NIST Special Publication 800-53, "Security and Privacy Controls for Federal Information Systems and Organizations": Recommends addressing TOCTOU vulnerabilities to ensure the integrity of security operations.
* "The Art of Software Security Assessment" by Mark Dowd, John McDonald, and Justin Schuh: Covers logic flaws and timing vulnerabilities, including TOCTOU issues.
NEW QUESTION # 29
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