CompTIA CS0-003 Online Practice Questions and Exam Preparation

CompTIA CS0-003 Online Questions & Answers

• Question 201:

  After updating the email client to the latest patch, only about 15% of the workforce is able to use email. Windows 10 users do not experience issues, but Windows 11 users have constant issues.

  Which of the following did the change management team fail to do?

  A. Implementation
  B. Testing
  C. Rollback
  D. Validation
  B. Testing

  ---

  Explanation

  Testing is a crucial step in any change management process, as it ensures that the change is compatible with the existing systems and does not cause any errors or disruptions. In this case, the change management team failed to test the email client patch on Windows 11 devices, which resulted in a widespread issue for the users. Testing would have revealed the problem before the patch was deployed, and allowed the team to fix it or postpone the change.

  References:

  7 Reasons.

  Why Change Management Strategies Fail and How to Avoid Them, CompTIA CySA+ CS0-003 Certification Study Guide

• Question 202:

  A company is aiming to test a new incident response plan. The management team has made it clear that the initial test should have no impact on the environment. The company has limited resources to support testing.

  Which of the following exercises would be the best approach?

  A. Tabletop scenarios
  B. Capture the flag
  C. Red team vs. blue team
  D. Unknown-environment penetration test
  A. Tabletop scenarios

  ---

  Explanation

  A tabletop scenario is an informal, discussion-based session in which a team discusses their roles and responses during an emergency, walking through one or more example scenarios. A tabletop scenario is the best approach for a company that wants to test a new incident response plan without impacting the environment or using many resources. A tabletop scenario can help the company identify strengths and weaknesses in their plan, clarify roles and responsibilities, and improve communication and coordination among team members. The other options are more intensive and disruptive exercises that involve simulating a real incident or attack. CompTIA Cybersecurity Analyst (CySA+) Certification Exam Objectives (CS0-002), page 16;

  https://www.linkedin.com/pulse/tabletop-exercises-explained-matt-lemon-phd

• Question 203:

  A security analyst is reviewing the network security monitoring logs listed below:

  ---------------------------------------------------------------------------

  Count: 2 Event#3.3505 2020-01-30 10:40 UTC

  GPL WEB SERVER robots. txt access

  10.1.1.128 -> 10.0.0.10

  IPVer=4 hlen=5 tos=0 dlen=269 ID=0 flags=0 offset=0 tt1=0 chksum=22704

  Protocol: 6 sport=45260 => dport=80

  Sec=0 Ack=0 Off=5 Res=0 Flags=******** Win=0 urp=23415 chksum=0

  ---------------------------------------------------------------------------

  Count: 22 Event#3.3507 2020-01-30 10:40 UTC

  ET WEB SPECIFIC APPS PHPStudy Remote Code Execution Backdoor

  10.1.1.129 -> 10.0.0.10

  IPVer=4 hen=5 tos=0 dlen=269 ID=0 flags=0 offset=0 tt1=0 chksum=22704

  Protocol: 6 sport=65200 -> dport=80

  Sea=0 Ack=0 off=5 Res=0 Flags=******** win=0 urp=26814 chksum=0

  ---------------------------------------------------------------------------

  Count: 30 Event#3.3522 2020-01-30 10:40 UTC

  ET WEB SERVER WEB-PHP phpinfo access

  10.1.1.130 -> 10.0.0.10

  IPVer=4 hen=5 tos=0 dlen=269 ID=0 flags=0 offset=0 tt1=0 chksum=22704

  Protocol: 6 sport=58175 -> dport=80

  Sec=0 Ack=0 Off=5 Res=0 Flags=******** win=0 urp=22875 chksum=0

  ---------------------------------------------------------------------------

  Count: 22 Event#3.3728 2020-01-30 10:40 UTC

  GPL WEB SERVER 403 Forbidden

  10.0.0.10 -> 10.1.1.129

  IPVer=4 hen=5 tos=0 dlen=533 ID=0 flags=0 offset=0 tt1=0 chksum=20471

  Protocol: 6 sport=80 -> dport=65200

  Sea=0 Ack=0 Off=5 Res=0 Flags=******** win=0 urp=59638 chksum=0

  ---------------------------------------------------------------------------

  Which of the following is the analyst MOST likely observing? (Choose two.)

  A. 10.1.1.128 sent potential malicious traffic to the web server.
  B. 10.1.1.128 sent malicious requests, and the alert is a false positive
  C. 10.1.1.129 successfully exploited a vulnerability on the web server
  D. 10.1.1.129 sent potential malicious requests to the web server
  E. 10.1.1.129 can determine mat port 443 is being used
  F. 10.1.1.130 can potentially obtain information about the PHP version
  D. 10.1.1.129 sent potential malicious requests to the web server
  F. 10.1.1.130 can potentially obtain information about the PHP version

  ---

  Explanation

  A security analyst is reviewing the network security monitoring logs listed below and is most likely observing that 10.1.1.129 sent potential malicious requests to the web server and that 10.1.1.130 can potentially obtain information about the PHP version. The logs show that 10.1.1.129 sent two requests to the web server with suspicious parameters, such as " " , which are commonly used for SQL injection attacks. The logs also show that 10.1.1.130 sent a request to the " , which is a function that displays information about the PHP configuration and environment, which can be useful for attackers to find vulnerabilities or exploit them. CompTIA Cybersecurity Analyst (CySA+) Certification Exam Objectives (CS0-002),

  page 8;

  https://owasp.org/www-community/attacks/SQL_Injection;

  https://www.php.net/manual/en/function.phpinfo.php

• Question 204:

  An analyst is conducting monitoring against an authorized team that win perform adversarial techniques. The analyst interacts with the team twice per day to set the stage for the techniques to be used.

  Which of the following teams is the analyst a member of?

  A. Orange team
  B. Blue team
  C. Red team
  D. Purple team
  D. Purple team

  ---

  Explanation

  The Purple team is a collaborative team that combines the efforts of both the Red team (attackers) and the Blue team (defenders). The Purple team facilitates communication between the Red and Blue teams to ensure that both are effectively working together, improving security posture. In this scenario, the analyst interacts with both the team performing adversarial techniques (likely Red team) and monitors the response (likely Blue team), which aligns with the role of the Purple team.

• Question 205:

  Which of the following are process improvements that can be realized by implementing a SOAR solution? (Select two).

  A. Minimize security attacks
  B. Itemize tasks for approval
  C. Reduce repetitive tasks
  D. Minimize setup complexity
  E. Define a security strategy
  F. Generate reports and metrics
  C. Reduce repetitive tasks
  F. Generate reports and metrics

  ---

  Explanation

  Comprehensive Detailed Explanation:SOAR (Security Orchestration, Automation, and Response) solutions are implemented to streamline security operations and improve efficiency. Key benefits include:

  C. Reduce repetitive tasks: SOAR solutions automate routine and repetitive tasks, which helps reduce analyst workload and minimize human error.

  F. Generate reports and metrics: SOAR platforms can automatically generate comprehensive reports and performance metrics, allowing organizations to track incident response times, analyze trends, and optimize security processes. Other options are less relevant to the core functions of SOAR:

  A. Minimize security attacks: While SOAR can aid in quicker response, it does not directly minimize the occurrence of attacks.

  B. Itemize tasks for approval: Task itemization for approval is more relevant to project management tools.

  D. Minimize setup complexity: SOAR solutions often require significant setup and integration with existing tools.

  E. Define a security strategy: SOAR is more focused on automating response rather than strategy definition.

  References:

  Gartner's Guide on SOAR Solutions: Discusses automation and reporting features. NIST SP 800-61: Computer Security Incident Handling Guide, on the value of automation in incident response.

• Question 206:

  A security analyst has found the following suspicious DNS traffic while analyzing a packet capture:

  1. DNS traffic while a tunneling session is active.

  2. The mean time between queries is less than one second.

  3. The average query length exceeds 100 characters.

  Which of the following attacks most likely occurred?

  A. DNS exfiltration
  B. DNS spoofing
  C. DNS zone transfer
  D. DNS poisoning
  A. DNS exfiltration

  ---

  Explanation

  DNS exfiltration is a technique that uses the DNS protocol to transfer data from a compromised network or device to an attacker-controlled server. DNS exfiltration can bypass firewall rules and security products that do not inspect DNS traffic.

  The characteristics of the suspicious DNS traffic in the question match the indicators of DNS exfiltration, such as: DNS traffic while a tunneling session is active: This implies that the DNS protocol is being used to create a covert channel for data transfer. The mean time between queries is less than one second: This implies that the DNS queries are being sent at a high frequency to maximize the amount of data transferred.

  The average query length exceeds 100 characters: This implies that the DNS queries are encoding large amounts of data in the subdomains or other fields of the DNS packets.

  References:

  https://partners.comptia.org/docs/default-source/resources/comptia-cysa-cs0-002-exam-objectiveshttps://resources.infosecinstitute.com/topic/bypassing-security-products-via-dns-data-exfiltration/https://www.reddit.com/r/CompTIA/comments/nvjuzt/dns_exfiltration_explanation/

• Question 207:

  A security analyst needs to provide evidence of regular vulnerability scanning on the company's network for an auditing process.

  Which of the following is an example of a tool that can produce such evidence?

  A. OpenVAS
  B. Burp Suite
  C. Nmap
  D. Wireshark
  A. OpenVAS

  ---

  Explanation

  OpenVAS is an open-source tool that performs comprehensive vulnerability scanning and assessment on the network. It can generate reports and evidence of the scan results, which can be used for auditing purposes.

  References:

  CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 5, page 199

  CompTIA CySA+ CS0-003 Certification Study Guide, Chapter 5, page 207.

• Question 208:

  A security analyst is reviewing existing email protection mechanisms to generate a report. The analysis finds the following DNS records:

  Record 1

  v=spf1 ip4:192:168.0.0/16 include:_spf.marketing.com include: thirdpartyprovider.com ~all

  Record 2

  "v=DKIM1\ k=rsa\; p=MIGfMA0GCSqh7d8hyh78Gdg87gd98hag86ga98dhay8gd7ashdca7yg79auhudig7df9ah8g76ag98dhay87ga9"

  Record 3

  _dmarc.comptia.com TXT v=DMARC1\; p=reject\; pct=100; rua=mailto:[email protected]

  Which of the following options provides accurate information to be included in the report?

  A. Record 3 serves as a reference of the security features configured at Record 1 and 2.
  B. Record 1 is used as a blocklist mechanism to filter unauthorized senders.
  C. Record 2 is used as a key to encrypt all outbound messages sent.
  D. The three records contain private information that should not be disclosed.
  A. Record 3 serves as a reference of the security features configured at Record 1 and 2.

  ---

  Explanation

  The DMARC record is what tells us to do with messages that don't properly align to SPF / DKIM.

  WRONG ANSWERS

  ?B ?this SPF record, as configured, is a softfail. That means it functions as less of a blocklist and more as a quarantine list.

  ?C ?the DKIM key is used to sign, not encrypt, outbound messages.

  ?D ?all 3 records must be in public DNS or e-mail servers outside the organization would be unable to reference them and use them.

• Question 209:

  A security analyst detects an email server that had been compromised in the internal network. Users have been reporting strange messages in their email inboxes and unusual network traffic.

  Which of the following incident response steps should be performed next?

  A. Preparation
  B. Validation
  C. Containment
  D. Eradication
  C. Containment

  ---

  Explanation

  After detecting a compromised email server and unusual network traffic, the next step in incident response is containment, to prevent further damage or spread of the compromise.

  References:

  CompTIA CySA+ Study Guide: Exam CS0-003, 3rd Edition, Chapter 5: Incident Response, page 197.

• Question 210:

  Which of the following is the BEST option to protect a web application against CSRF attacks?

  A. Update the web application to the latest version.
  B. Set a server-side rate limit for CSRF token generation.
  C. Avoid the transmission of CSRF tokens using cookies.
  D. Configure the web application to only use HTTPS and TLS 1.3.
  C. Avoid the transmission of CSRF tokens using cookies.

  ---

  Explanation

  CSRF tokens are random values that are generated by the server and included in requests that perform state-changing actions. They are used to prevent CSRF attacks by verifying that the request originates from a legitimate source.

  However, if the CSRF tokens are transmitted using cookies, they are vulnerable to being stolen or forged by an attacker who can exploit other vulnerabilities, such as cross-site scripting (XSS) or cookie injection. Therefore, a better option is to avoid the transmission of CSRF tokens using cookies and use other methods, such as hidden form fields or custom HTTP headers. CompTIA Cybersecurity Analyst (CySA+) Certification Exam Objectives (CS0-002), page 11;

  https://owasp.org/www-community/attacks/csrf