CompTIA CS0-003 Online Practice Questions and Exam Preparation

CompTIA CS0-003 Online Questions & Answers

• Question 551:

  Which of the following should be updated after a lessons-learned review?

  A. Disaster recovery plan
  B. Business continuity plan
  C. Tabletop exercise
  D. Incident response plan
  D. Incident response plan

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  Explanation

  A lessons-learned review is a process of evaluating the effectiveness and efficiency of the incident response plan after an incident or an exercise. The purpose of the review is to identify the strengths and weaknesses of the incident response plan, and to update it accordingly to improve the future performance and resilience of the organization. Therefore, the incident response plan should be updated after a lessons-learned review.

  References:

  The answer was based on the NCSC CAF guidance from the National Cyber Security Centre, which states: "You should use post-incident and post-exercise reviews to actively reduce the risks associated with the same, or similar, incidents happening in future. Lessons learned can inform any aspect of your cyber security, including: System configuration Security monitoring and reporting Investigation procedures Containment/recovery strategies"

• Question 552:

  Which of the following explains why a company would consider enriching data before sending it to the SIEM?

  A. To prevent injection attacks against the log management system
  B. To reduce the amount and cost of data storage for security incidents
  C. To provide more information to SOC analysts when analyzing events
  D. To normalize the data before saving it to the database tables
  C. To provide more information to SOC analysts when analyzing events

• Question 553:

  Which of the following best describes the importance of implementing TAXII as part of a threat intelligence program?

  A. It provides a structured way to gain information about insider threats.
  B. It proactively facilitates real-time information sharing between the public and private sectors.
  C. It exchanges messages in the most cost-effective way and requires little maintenance once implemented.
  D. It is a semi-automated solution to gather threat intellbgence about competitors in the same sector.
  B. It proactively facilitates real-time information sharing between the public and private sectors.

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  Explanation

  TAXII, or Trusted Automated eXchange of Intelligence Information, is a standard protocol for sharing cyber threat intelligence in a standardized, automated, and secure manner. TAXII defines how cyber threat information can be shared via services and message exchanges, such as discovery, collection management, inbox, and poll. TAXII is designed to support STIX, or Structured Threat Information eXpression, which is a standardized language for describing cyber threat information in a readable and consistent format. Together, STIX and TAXII form a framework for sharing and using threat intelligence, creating an open-source platform that allows users to search through records containing attack vectors details such as malicious IP addresses, malware signatures, and threat actors 123.

  The importance of implementing TAXII as part of a threat intelligence program is that it proactively facilitates real-time information sharing between the public and private sectors. By using TAXII, organizations can exchange cyber threat information with various entities, such as security vendors, government agencies, industry associations, or trusted groups. TAXII enables different sharing models, such as hub and spoke, source/subscriber, or peer-to-peer, depending on the needs and preferences of the information producers and consumers. TAXII also supports different levels of access control, encryption, and authentication to ensure the security and privacy of the shared information 123. By implementing TAXII as part of a threat intelligence program, organizations can benefit from the following advantages: They can receive timely and relevant information about the latest threats and vulnerabilities that may affect their systems or networks. They can leverage the collective knowledge and experience of other organizations that have faced similar or related threats.

  They can improve their situational awareness and threat detection capabilities by correlating and analyzing the shared information. They can enhance their incident response and mitigation strategies by applying the best practices and recommendations from the shared information. They can contribute to the overall improvement of cyber security by sharing their own insights and feedback with other organizations 123. The other options are incorrect because they do not accurately describe the importance of implementing TAXII as part of a threat intelligence program. Option A is incorrect because TAXII does not provide a structured way to gain information about insider threats. Insider threats are malicious activities conducted by authorized users within an organization, such as employees, contractors, or partners. Insider threats can be detected by using various methods, such as user behavior analysis, data loss prevention, or anomaly detection. However, TAXII is not designed to collect or share information about insider threats specifically. TAXII is more focused on external threats that originate from outside sources, such as hackers, cybercriminals, or nation-states 4.

  Option C is incorrect because TAXII does not exchange messages in the most cost-effective way and requires little maintenance once implemented. TAXII is a protocol that defines how messages are exchanged, but it does not specify the cost or maintenance of the exchange. The cost and maintenance of implementing TAXII depend on various factors, such as the type and number of services used, the volume and frequency of data exchanged, the security and reliability requirements of the exchange, and the availability and compatibility of existing tools and platforms. Implementing TAXII may require significant resources and efforts from both the information producers and consumers to ensure its functionality and performance 5.

  Option D is incorrect because TAXII is not a semi-automated solution to gather threat intelligence about competitors in the same sector. TAXII is a fully automated solution that enables the exchange of threat intelligence among various entities across different sectors. TAXII does not target or collect information about specific competitors in the same sector. Rather, it aims to foster collaboration and cooperation among organizations that share common interests or goals in cyber security. Moreover, gathering threat intelligence about competitors in the same sector may raise ethical and legal issues that are beyond the scope of TAXII.

  References:

  1 What is STIX/TAXII? | Cloudflare

  2 What Are STIX/TAXII Standards? - Anomali Resources 3 What is STIX and TAXII? - EclecticIQ

  4 What Is an Insider Threat? Definition & Examples | Varonis

  5 Implementing STIX/TAXII - GitHub Pages

  6. Cyber Threat Intelligence: Ethical Hacking vs Unethical Hacking | Infosec

• Question 554:

  A cybersecurity team lead is developing metrics to present in the weekly executive briefs. Executives are interested in knowing how long it takes to stop the spread of malware that enters the network.

  Which of the following metrics should the team lead include in the briefs?

  A. Mean time between failures
  B. Mean time to detect
  C. Mean time to remediate
  D. Mean time to contain
  C. Mean time to remediate

• Question 555:

  During an incident response procedure, a security analyst acquired the needed evidence from the hard drive of a compromised machine.

  Which of the following actions should the analyst perform next to ensure the data integrity of the evidence?

  A. Generate hashes for each file from the hard drive.
  B. Create a chain of custody document.
  C. Determine a timeline of events using correct time synchronization.
  D. Keep the cloned hard drive in a safe place.
  A. Generate hashes for each file from the hard drive.

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  Explanation

  Generating hashes for each file from the hard drive is the next action that the analyst should perform to ensure the data integrity of the evidence. Hashing is a technique that produces a unique and fixedlength value for a given input, such as a file or a message. Hashing can help to verify the data integrity of the evidence by comparing the hash values of the original and copied files. If the hash values match, then the evidence has not been altered or corrupted. If the hash values differ, then the evidence may have been tampered with or damaged .

• Question 556:

  Which of the following is most appropriate to use with SOAR when the security team would like to automate actions across different vendor platforms?

  A. STIX/TAXII
  B. APIs
  C. Data enrichment
  D. Threat feed
  B. APIs

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  Explanation

  APIs (Application Programming Interfaces) enable integration and automation across different vendor platforms within a SOAR (Security Orchestration, Automation, and Response) solution. They allow security tools to communicate and execute automated actions, making them essential for orchestrating responses across diverse systems and platforms. While STIX/TAXII provides standards for threat information sharing, and data enrichment enhances context, APIs are the primary means of enabling cross-platform automation, as recommended in CompTIA CySA+ materials on SOAR operations.

• Question 557:

  A security analyst reviews a packet capture and identifies the following output as anomalous:

  

  Which of the following activities explains the output?

  A. Nmap Xmas scan
  B. Nikto's web scan
  C. Socat's proxying traffic using the urgent flag
  D. Angry IP Scanner output
  A. Nmap Xmas scan

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  Explanation

  The captured traffic shows TCP packets with the Flags [FPU], which indicate that the FIN, PSH, and URG flags are set. This is characteristic of an Nmap Xmas scan. The Xmas scan is a type of port scan that sends packets with these flags set to determine port states based on responses from the target system. This technique is often used in stealth scanning to evade detection by firewalls or IDS/IPS. Nikto's web scan (B) is used for identifying web server vulnerabilities but does not generate TCP packets with such unusual flags. Socat's proxying (C) would not exhibit the specific Xmas scan pattern. Angry IP Scanner (D) is a general-purpose scanner that does not use the TCP flags seen in this capture.

• Question 558:

  A security analyst is reviewing a recent vulnerability scan report for a new server infrastructure. The analyst would like to make the best use of time by resolving the most critical vulnerability first. The following information is provided:

  

  Which of the following should the analyst concentrate remediation efforts on first?

  A. SVR01
  B. SVR02
  C. SVR03
  D. SVR04
  B. SVR02

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  Explanation

  SVR02 has a CVSS score of 7.1 and is exploitable, making it the highest priority for remediation.

  SVR01 (CVSS 8.9) is not exploitable, so it is a lower risk. SVR03 (CVSS 3.5) is exploitable but has a lower severity than SVR02. SVR04 (CVSS 6.7) is not exploitable, reducing its urgency. Thus, B (SVR02) is the correct answer, as it presents the highest immediate risk.

• Question 559:

  A security analyst received a malicious binary file to analyze.

  Which of the following is the best technique to perform the analysis?

  A. Code analysis
  B. Static analysis
  C. Reverse engineering
  D. Fuzzing
  C. Reverse engineering

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  Explanation

  Reverse engineering is a technique that involves analyzing a binary file to understand its structure, functionality, and behavior. Reverse engineering can help security analysts perform malware analysis, vulnerability research, exploit development, and software debugging. Reverse engineering can be done using various tools, such as disassemblers, debuggers, decompilers, and hex editors.

• Question 560:

  An organization conducted a web application vulnerability assessment against the corporate website, and the following output was observed:

  

  Which of the following tuning recommendations should the security analyst share?

  A. Set an HttpOnlvflaq to force communication by HTTPS
  B. Block requests without an X-Frame-Options header
  C. Configure an Access-Control-Allow-Origin header to authorized domains
  D. Disable the cross-origin resource sharing header
  C. Configure an Access-Control-Allow-Origin header to authorized domains