CompTIA CS0-003 Online Practice Questions and Exam Preparation

CompTIA CS0-003 Online Questions & Answers

• Question 21:

  A security analyst is trying to identify possible network addresses from different source networks belonging to the same company and region.

  Which of the following shell script functions could help achieve the goal?

  A. function w() { a=$(ping -c 1 $1 | awk-F "/" 'END{print $1}') && echo "$1 | $a" }
  B. function x() { b=traceroute -m 40 $1 | awk 'END{print $1}') && echo "$1 | $b" }
  C. function y() { dig $(dig -x $1 | grep PTR | tail -n 1 | awk -F ".in-addr" '{print $1}').origin.asn.cymru.com TXT +short }
  D. function z() { c=$(geoiplookup$1) && echo "$1 | $c" }
  C. function y() { dig $(dig -x $1 | grep PTR | tail -n 1 | awk -F ".in-addr" '{print $1}').origin.asn.cymru.com TXT +short }

  ---

  Explanation

  The shell script function that could help identify possible network addresses from different source networks belonging to the same company and region is:

  function y() { dig $(dig -x $1 | grep PTR | tail -n 1 | awk -F ".in-addr" '{print $1}').origin.asn.cymru.com TXT +short }

  This function takes an IP address as an argument and performs two DNS lookups using the dig command. The first lookup uses the -x option to perform a reverse DNS lookup and get the hostname associated with the IP address. The second lookup uses the origin.asn.cymru.com domain to get the autonomous system number (ASN) and other information related to the IP address, such as the country code, registry, or allocation date. The function then prints the IP address and the ASN information, which can help identify any network addresses that belong to the same ASN or region

• Question 22:

  A company has the following security requirements:

  1. No public IPs

  2. All data secured at rest

  3. No insecure ports/protocols

  After a cloud scan is completed, a security analyst receives reports that several misconfigurations are putting the company at risk. Given the following cloud scanner output:

  

  Which of the following should the analyst recommend be updated first to meet the security requirements and reduce risks?

  A. VM_PRD_DB
  B. VM_DEV_DB
  C. VM_DEV_Web02
  D. VM_PRD_Web01
  A. VM_PRD_DB

• Question 23:

  An e-commerce organization recently experienced a cyberattack. During a lessons learned meeting, a cybersecurity analyst requests that the RTO is prioritized.

  Which of the following is the greatest concern?

  A. Integrity
  B. Availability
  C. Non-repudiation
  D. Confidentiality
  B. Availability

• Question 24:

  Which of the following is a KPI that is used to monitor or report on the effectiveness of an incident response reporting and communication program?

  A. Incident volume
  B. Mean time to detect
  C. Average time to patch
  D. Remediated incidents
  D. Remediated incidents

  ---

  Explanation

  Comprehensive and Detailed Step-by-Step Explanation:Remediated incidents is a key performance indicator (KPI) that measures how effectively incidents are resolved and communicated during the incident response lifecycle. It reflects the program's success in mitigating risks and restoring normal operations. Other options (e.g., mean time to detect) are important metrics but do not directly measure reporting or communication effectiveness.

  References:

  CompTIA CySA+ Study Guide (Chapter 4: Reporting and Metrics, Page 425) CompTIA CySA+ Objectives (Domain 4.0 - Reporting and Communication)

• Question 25:

  During an incident, an analyst needs to acquire evidence for later investigation.

  Which of the following must be collected first in a computer system, related to its volatility level?

  A. Disk contents
  B. Backup data
  C. Temporary files
  D. Running processes
  D. Running processes

  ---

  Explanation

  The most volatile type of evidence that must be collected first in a computer system is running processes. Running processes are programs or applications that are currently executing on a computer system and using its resources, such as memory, CPU, disk space, or network bandwidth. Running processes are very volatile because they can change rapidly or disappear completely when the system is shut down, rebooted, logged off, or crashed. Running processes can also be affected by other processes or users that may modify or terminate them. Therefore, running processes must be collected first before any other type of evidence in a computer system

• Question 26:

  An analyst is becoming overwhelmed with the number of events that need to be investigated for a timeline.

  Which of the following should the analyst focus on in order to move the incident forward?

  A. Impact
  B. Vulnerability score
  C. Mean time to detect
  D. Isolation
  A. Impact

  ---

  Explanation

  The analyst should focus on the impact of the events in order to move the incident forward. Impact is the measure of the potential or actual damage caused by an incident, such as data loss, financial loss, reputational damage, or regulatory penalties. Impact can help the analyst prioritize the events that need to be investigated based on their severity and urgency, and allocate the appropriate resources and actions to contain and remediate them. Impact can also help the analyst communicate the status and progress of the incident to the stakeholders and customers, and justify the decisions and recommendations made during the incident response 12. Vulnerability score, mean time to detect, and isolation are all important metrics or actions for incident response, but they are not the main focus for moving the incident forward. Vulnerability score is the rating of the likelihood and severity of a vulnerability being exploited by a threat actor. Mean time to detect is the average time it takes to discover an incident. Isolation is the process of disconnecting an affected system from the network to prevent further damage or spread of the incident34 .

  References:

  Incident Response: Processes, Best Practices & Tools - Atlassian, Incident Response Metrics: What You Should Be Measuring, Vulnerability Scanning Best Practices, How to Track Mean Time to Detect (MTTD) and Mean Time to Respond (MTTR) to Cybersecurity Incidents, [Isolation and Quarantine for Incident Response]

• Question 27:

  A security analyst is reviewing events that occurred during a possible compromise. The analyst obtains the following log:

  

  Which of the following is most likely occurring, based on the events in the log?

  A. An adversary is attempting to find the shortest path of compromise.
  B. An adversary is performing a vulnerability scan.
  C. An adversary is escalating privileges.
  D. An adversary is performing a password stuffing attack.
  A. An adversary is attempting to find the shortest path of compromise.

• Question 28:

  A security analyst runs the following command:

  

  Which of the following should the analyst recommend first to harden the system?

  A. Disable all protocols that do not use encryption.
  B. Configure client certificates for domain services.
  C. Ensure that this system is behind a NGFW.
  D. Deploy a publicly trusted root CA for secure websites.
  A. Disable all protocols that do not use encryption.

  ---

  Explanation

  Comprehensive Detailed Explanation:The nmap scan results show that Telnet (port 23) is open. Telnet transmits data, including credentials, in plaintext, which is insecure and should be disabled to enhance security. Here's an explanation of each option:

  A. Disable all protocols that do not use encryption

  B. Configure client certificates for domain services

  C. Ensure that this system is behind a NGFW

  D. Deploy a publicly trusted root CA for secure websites References: CIS Controls: Recommendations on secure configurations, especially the use of encrypted protocols. NIST SP 800-47: Security considerations for network protocols, emphasizing encrypted alternatives like SSH over Telnet.

• Question 29:

  Which of the following attributes is part of the Diamond Model of Intrusion Analysis?

  A. Delivery
  B. Weaponization
  C. Command and control
  D. Capability
  D. Capability

  ---

  Explanation

  The Diamond Model of Intrusion Analysis consists of four core attributes: Adversary ?The threat actor behind the attack.

  Capability ?The tools and techniques used.

  Infrastructure ?The systems used by the adversary (e.g., botnets, C2 servers).

  Victim ?The target of the attack.

  Option A (Delivery) and Option B (Weaponization) are part of the Cyber Kill Chain, not the Diamond Model.

  Option C (Command and control) is an attack phase but not a core attribute of the Diamond Model.

  Option D (Capability) is correct, as it represents the tools and attack methods used by adversaries.

  Thus, D is the correct answer.

• Question 30:

  A security officer needs to find a solution to the current data privacy and protection gap found in the last security assessment.

  Which of the following is the most cost-effective solution?

  A. Require users to sign NDAs.
  B. Create a data minimization plan.
  C. Add access control requirements.
  D. Implement a data loss prevention solution.
  B. Create a data minimization plan.