CompTIA CS0-003 Online Practice Questions and Exam Preparation

CompTIA CS0-003 Online Questions & Answers

• Question 151:

  An analyst views the following log entries:

  

  The organization has a partner vendor with hosts in the 216.122.5.x range. This partner vendor is required to have access to monthly reports and is the only external vendor with authorized access.

  The organization prioritizes incident investigation according to the following hierarchy:

  1. unauthorized data disclosure is more critical than denial of service attempts

  2. which are more important than ensuring vendor data access

  Based on the log files and the organization's priorities, which of the following hosts warrants additional investigation?

  A. 121.19.30.221
  B. 134.17.188.5
  C. 202.180.1582
  D. 216.122.5.5
  A. 121.19.30.221

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  Explanation

  Based on the log files and the organization's priorities, the host that warrants additional investigation is 121.19.30.221, because it is the only host that accessed a file containing sensitive data and is not from the partner vendor's range.

  The log files show the following information: The IP addresses of the hosts that accessed the web server.

  The date and time of the access

  The file path of the requested resource

  The number of bytes transferred

  The organization's priorities are: Unauthorized data disclosure is more critical than denial of service attempts Denial of service attempts are more important than ensuring vendor data access According to these priorities, the most serious threat to the organization is unauthorized data disclosure, which occurs when sensitive, protected, or confidential data is copied, transmitted, viewed, stolen, altered, or used by an individual unauthorized to do so123. Therefore, the host that accessed a file containing sensitive data and is not from the partner vendor's range poses the highest risk to the organization. The file that contains sensitive data is /reports/2023/financials.pdf, as indicated by its name and path. This file was accessed by two hosts: 121.19.30.221 and 216.122.5.5. However, only 121.19.30.221 is not from the partner vendor's range, which is 216.122.5.x. Therefore, 121.19.30.221 is a potential unauthorized data disclosure threat and warrants additional investigation.

  The other hosts do not warrant additional investigation based on the log files and the organization's priorities.

  Host 134.17.188.5 accessed /index.html multiple times in a short period of time, which could indicate a denial of service attempt by flooding the web server with requests 45. However, denial of service attempts are less critical than unauthorized data disclosure according to the organization's priorities, and there is no evidence that this host succeeded in disrupting the web server's normal operations.

  Host 202.180.1582 accessed /images/logo.png once, which does not indicate any malicious activity or threat to the organization.

  Host 216.122.5.5 accessed /reports/2023/financials.pdf once, which could indicate unauthorized data disclosure if it was not authorized to do so. However, this host is from the partner vendor's range, which is required to have access to monthly reports and is the only external vendor with authorized access according to the organization's requirements. Therefore, based on the log files and the organization's priorities, host 121.19.30.221 warrants additional investigation as it poses the highest risk of unauthorized data disclosure to the organization.

• Question 152:

  An organization identifies a method to detect unexpected behavior, crashes, or resource leaks in a system by feeding invalid, unexpected, or random data to stress the application.

  Which of the following best describes this testing methodology?

  A. Reverse engineering
  B. Static
  C. Fuzzing
  D. Debugging
  C. Fuzzing

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  Explanation

  Fuzzing is a testing technique where invalid or random data is inputted into a system to find vulnerabilities, crashes, or unexpected behaviors. It's commonly used in software security to identify flaws that could lead to security breaches.

  According to CompTIA's CySA+ curriculum, fuzzing is a dynamic testing method for exposing application weaknesses. Options like static testing (B) involve analyzing code without execution, while reverse engineering (A) and debugging (D) involve different methodologies for understanding or fixing code, not intentionally stressing it.

• Question 153:

  A security analyst discovers that an internal device is sending HTTPS traffic with additional characters in the header to a known-malicious IP in another country.

  What type of activity is most likely occurring?

  A. Cross-site scripting
  B. Buffer overflow
  C. Beaconing
  D. PHP traversal
  C. Beaconing

• Question 154:

  Which of the following best describes the process of requiring remediation of a known threat within a given time frame?

  A. SLA
  B. MOU
  C. Best-effort patching
  D. Organizational governance
  A. SLA

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  Explanation

  An SLA (Service Level Agreement) is a contract or agreement between a service provider and a customer that defines the expected level of service, performance, quality, and availability of the service. An SLA also specifies the responsibilities, obligations, and penalties for both parties in case of non-compliance or breach of the agreement. An SLA can help organizations to ensure that their security services are delivered in a timely and effective manner, and that any security incidents or vulnerabilities are addressed and resolved within a specified time frame. An SLA can also help to establish clear communication, expectations, and accountability between the service provider and the customer12 An MOU (Memorandum of Understanding) is a document that expresses a mutual agreement or understanding between two or more parties on a common goal or objective. An MOU is not legally binding, but it can serve as a basis for future cooperation or collaboration. An MOU may not be suitable for requiring remediation of a known threat within a given time frame, as it does not have the same level of enforceability, specificity, or measurability as an SLA. Best-effort patching is an informal and ad hoc approach to applying security patches or updates to systems or software. Best-effort patching does not follow any defined process, policy, or schedule, and relies on the availability and discretion of the system administrators or users. Best-effort patching may not be effective or efficient for requiring remediation of a known threat within a given time frame, as it does not guarantee that the patches are applied correctly, consistently, or promptly. Best-effort patching may also introduce new risks or vulnerabilities due to human error, compatibility issues, or lack of testing. Organizational governance is the framework of rules, policies, procedures, and processes that guide and direct the activities and decisions of an organization. Organizational governance can help to establish the roles, responsibilities, and accountabilities of different stakeholders within the organization, as well as the goals, values, and principles that shape the organizational culture and behavior. Organizational governance can also help to ensure compliance with internal and external standards, regulations, and laws. Organizational governance may not be sufficient for requiring remediation of a known threat within a given time frame, as it does not specify the details or metrics of the service delivery or performance. Organizational governance may also vary depending on the size, structure, and nature of the organization.

• Question 155:

  Which of the following risk management principles is accomplished by purchasing cyber insurance?

  A. Accept
  B. Avoid
  C. Mitigate
  D. Transfer
  D. Transfer

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  Explanation

  Transfer is the risk management principle that is accomplished by purchasing cyber insurance. Transfer is a strategy that involves shifting the risk or its consequences to another party, such as an insurance company, a vendor, or a partner.

  Transfer does not eliminate the risk, but it reduces the potential impact or liability of the risk for the original party. Cyber insurance is a type of insurance that covers the losses and damages resulting from cyberattacks, such as data breaches, ransomware, denial-of-service attacks, or network disruptions. Cyber insurance can help transfer the risk of cyber incidents by providing financial compensation, legal assistance, or recovery services to the insured party.

  https://partners.comptia.org/docs/default-source/resources/comptia-cysa-cs0-002-exam-objectives

  https://www.comptia.org/certifications/cybersecurity-analyst

  https://www.comptia.org/blog/the-new-comptia-cybersecurity-analyst-your-questions-answered

• Question 156:

  A team of analysts is developing a new internal system that correlates information from a variety of sources analyzes that information, and then triggers notifications according to company policy.

  Which of the following technologies was deployed?

  A. SIEM
  B. SOAR
  C. IPS
  D. CERT
  B. SOAR

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  Explanation

  SOAR (Security Orchestration, Automation, and Response) refers to a collection of software solutions and tools that allow an organization to streamline security operations in three key areas: threat and vulnerability management, incident response, and security operations automation. It correlates information from various sources, analyzes it, and triggers notifications or actions based on predefined policies, which matches the scenario described.

• Question 157:

  Which of the following is the most likely reason for an organization to assign different internal departmental groups during the post-incident analysis and improvement process?

  A. To expose flaws in the incident management process related to specific work areas
  B. To ensure all staff members get exposure to the review process and can provide feedback
  C. To verify that the organization playbook was properly followed throughout the incident
  D. To allow cross-training for staff who are not involved in the incident response process
  A. To expose flaws in the incident management process related to specific work areas

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  Explanation

  The post-incident review process helps an organization identify gaps in its response and security posture. Assigning different departmental groups ensures that flaws in specific work areas (such as IT, HR, or legal teams) are identified and addressed. Option B is incorrect because not all staff need exposure; the review focuses on relevant stakeholders.

  Option C is a part of the process, but the main goal is improvement, not just playbook verification.

  Option D (cross-training) is a benefit but not the main objective. Thus, A is the best answer because it focuses on identifying flaws in specific areas of incident management.

• Question 158:

  A security analyst is trying to detect connections to a suspicious IP address by collecting the packet captures from the gateway.

  Which of the following commands should the security analyst consider running?

  A. grep [IP address] packets.pcap
  B. cat packets.pcap | grep [IP Address]
  C. tcpdump -n -r packets.pcap host [IP address]
  D. strings packets.pcap | grep [IP Address]
  C. tcpdump -n -r packets.pcap host [IP address]

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  Explanation

  The -n flag ensures that numeric IP addresses are not resolved to hostnames, and the -r flag specifies the input pcap file. The host [IP address] expression filters packets that involve the specified IP address, helping the security analyst detect connections to the suspicious IP address.

• Question 159:

  Which of the following defines the proper sequence of data volatility regarding the evidence collection process, from the most to least volatile?

  A. Routing table, registers, physical memory, archival media, hard disk, physical configuration
  B. Routing table, registers, physical memory, temporary partition, hard disk, physical configuration
  C. Cache, routing table, physical memory, network topology, temporary partition, hard disk
  D. Cache, routing table, physical memory, temporary partition, hard disk, physical configuration
  D. Cache, routing table, physical memory, temporary partition, hard disk, physical configuration

• Question 160:

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

  

  Which of the following malicious activities was attempted?

  A. Command injection
  B. XML injection
  C. Server-side request forgery
  D. Cross-site scripting
  D. Cross-site scripting

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  Explanation

  XSS is a type of web application attack that exploits the vulnerability of a web server or browser to execute malicious scripts or commands on the client-side. XSS attackers inject malicious code, such as JavaScript, VBScript, HTML, or CSS, into a web page or application that is viewed by other users. The malicious code can then access or manipulate the user's session, cookies, browser history, or personal information, or perform actions on behalf of the user, such as stealing credentials, redirecting to phishing sites, or installing malware

  The line in the web server log shows an example of an XSS attack using VBScript. The attacker tried to insert an <IMG> tag with a malicious SRC attribute that contains a VBScript code. The VBScript code is intended to display a message box with the text "test" when the user views the web page or application. This is a simple and harmless example of XSS, but it could be used to test the vulnerability of the web server or browser, or to launch more sophisticated and harmful attacks