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CompTIA CAS-005 認定試験の出題範囲:
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| トピック 2 |
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CompTIA SecurityX Certification Exam 認定 CAS-005 試験問題 (Q25-Q30):
質問 # 25
An organization is planning for disaster recovery and continuity of operations, and has noted the following relevant findings:
1. A natural disaster may disrupt operations at Site A, which would then cause an evacuation. Users are unable to log into the domain from-their workstations after relocating to Site B.
2. A natural disaster may disrupt operations at Site A, which would then cause the pump room at Site B to become inoperable.
3. A natural disaster may disrupt operations at Site A, which would then cause unreliable internet connectivity at Site B due to route flapping.
INSTRUCTIONS
Match each relevant finding to the affected host by clicking on the host name and selecting the appropriate number.
For findings 1 and 2, select the items that should be replicated to Site B. For finding 3, select the item requiring configuration changes, then select the appropriate corrective action from the drop-down menu.

正解:
解説:
See the complete solution below in Explanation:
Explanation:
Matching Relevant Findings to the Affected Hosts:
* Finding 1:
* Affected Host: DNS
* Reason: Users are unable to log into the domain from their workstations after relocating to Site B, which implies a failure in domain name services that are critical for user authentication and domain login.
* Finding 2:
* Affected Host: Pumps
* Reason: The pump room at Site B becoming inoperable directly points to the critical infrastructure components associated with pumping operations.
* Finding 3:
* Affected Host: VPN Concentrator
* Reason: Unreliable internet connectivity at Site B due to route flapping indicates issues with network routing, which is often managed by VPN concentrators that handle site-to-site
* connectivity.
Corrective Actions for Finding 3:
* Finding 3 Corrective Action:
* Action: Modify the BGP configuration
* Reason: Route flapping is often related to issues with Border Gateway Protocol (BGP) configurations. Adjusting BGP settings can stabilize routes and improve internet connectivity reliability.
* Replication to Site B for Finding 1:
* Affected Host: DNS
* Explanation: Domain Name System (DNS) services are essential for translating domain names into IP addresses, allowing users to log into the network. Replicating DNS services ensures that even if Site A is disrupted, users at Site B can still authenticate and access necessary resources.
* Replication to Site B for Finding 2:
* Affected Host: Pumps
* Explanation: The operation of the pump room is crucial for maintaining various functions within the infrastructure. Replicating the control systems and configurations for the pumps at Site B ensures that operations can continue smoothly even if Site A is affected.
* Configuration Changes for Finding 3:
* Affected Host: VPN Concentrator
* Explanation: Route flapping is a situation where routes become unstable, causing frequent changes in the best path for data to travel. This instability can be mitigated by modifying BGP configurations to ensure more stable routing. VPN concentrators, which manage connections between sites, are typically configured with BGP for optimal routing.
References:
* CompTIA Security+ Study Guide: This guide provides detailed information on disaster recovery and continuity of operations, emphasizing the importance of replicating critical services and making necessary configuration changes to ensure seamless operation during disruptions.
* CompTIA Security+ Exam Objectives: These objectives highlight key areas in disaster recovery planning, including the replication of critical services and network configuration adjustments.
* Disaster Recovery and Business Continuity Planning (DRBCP): This resource outlines best practices for ensuring that operations can continue at an alternate site during a disaster, including the replication of essential services and network stability measures.
By ensuring that critical services like DNS and control systems for pumps are replicated at the alternate site, and by addressing network routing issues through proper BGP configuration, the organization can maintain operational continuity and minimize the impact of natural disasters on their operations.
質問 # 26
SIMULATION
[Security Architecture]
During the course of normal SOC operations, three anomalous events occurred and were flagged as potential IoCs. Evidence for each of these potential IoCs is provided.
INSTRUCTIONS
Review each of the events and select the appropriate analysis and remediation options for each IoC.


正解:
解説:
See the solution below in Explanation
Explanation:
Analysis and Remediation Options for Each IoC:
IoC 1:
Evidence:
Source: Apache_httpd
Type: DNSQ
Dest: @10.1.1.1:53,@10.1.2.5
Data: update.s.domain, CNAME 3a129sk219r9slmfkzzz000.s.domain, 108.158.253.253 Analysis:
Analysis: The service is attempting to resolve a malicious domain.
Reason: The DNS queries and the nature of the CNAME resolution indicate that the service is trying to resolve potentially harmful domains, which is a common tactic used by malware to connect to command-and-control servers.
Remediation:
Remediation: Implement a blocklist for known malicious ports.
Reason: Blocking known malicious domains at the DNS level prevents the resolution of harmful domains, thereby protecting the network from potential connections to malicious servers.
IoC 2:
Evidence:
Src: 10.0.5.5
Dst: 10.1.2.1, 10.1.2.2, 10.1.2.3, 10.1.2.4, 10.1.2.5
Proto: IP_ICMP
Data: ECHO
Action: Drop
Analysis:
Analysis: Someone is footprinting a network subnet.
Reason: The repeated ICMP ECHO requests to different addresses within a subnet indicate that someone is scanning the network to discover active hosts, a common reconnaissance technique used by attackers.
Remediation:
Remediation: Block ping requests across the WAN interface.
Reason: Blocking ICMP ECHO requests on the WAN interface can prevent attackers from using ping sweeps to gather information about the network topology and active devices.
IoC 3:
Evidence:
Proxylog:
GET /announce?info_hash=%01dff%27f%21%10%c5%wp%4e%1d%6f%63%3c%49%6d&peer_id%3dxJFS Uploaded=0&downloaded=0&left=3767869&compact=1&ip=10.5.1.26&event=started User-Agent: RAZA 2.1.0.0 Host: localhost Connection: Keep-Alive HTTP200 OK Analysis:
Analysis: An employee is using P2P services to download files.
Reason: The HTTP GET request with parameters related to a BitTorrent client indicates that the employee is using peer-to-peer (P2P) services, which can lead to unauthorized data transfer and potential security risks.
Remediation:
Remediation: Enforce endpoint controls on third-party software installations.
Reason: By enforcing strict endpoint controls, you can prevent the installation and use of unauthorized software, such as P2P clients, thereby mitigating the risk of data leaks and other security threats associated with such applications.
Reference:
CompTIA Security+ Study Guide: This guide offers detailed explanations on identifying and mitigating various types of Indicators of Compromise (IoCs) and the corresponding analysis and remediation strategies.
CompTIA Security+ Exam Objectives: These objectives cover key concepts in network security monitoring and incident response, providing guidelines on how to handle different types of security events.
Security Operations Center (SOC) Best Practices: This resource outlines effective strategies for analyzing and responding to anomalous events within a SOC, including the use of blocklists, endpoint controls, and network configuration changes.
By accurately analyzing the nature of each IoC and applying the appropriate remediation measures, the organization can effectively mitigate potential security threats and maintain a robust security posture.
質問 # 27
A security architect wants to develop a baseline of security configurations. These configurations automatically will be utilized machine is created. Which of the following technologies should the security architect deploy to accomplish this goal?
- A. Short
- B. CMDB
- C. Ansible
- D. GASB
正解:C
解説:
To develop a baseline of security configurations that will be automatically utilized when a machine is created, the security architect should deploy Ansible.
Automation: Ansible is an automation tool that allows for the configuration, management, and deployment of applications and systems. It ensures that security configurations are consistently applied across all new machines.
Scalability: Ansible can scale to manage thousands of machines, making it suitable for large enterprises that need to maintain consistent security configurations across their infrastructure.
Compliance: By using Ansible, organizations can enforce compliance with security policies and standards, ensuring that all systems are configured according to best practices.
質問 # 28
During a forensic review of a cybersecurity incident, a security engineer collected a portion of the payload used by an attacker on a comprised web server Given the following portion of the code:
Which of the following best describes this incident?
- A. Command injection
- B. Stored XSS
- C. SQL injection
- D. XSRF attack
正解:B
解説:
The provided code snippet shows a script that captures the user's cookies and sends them to a remote server.
This type of attack is characteristic of Cross-Site Scripting (XSS), specifically stored XSS, where the malicious script is stored on the target server (e.g., in a database) and executed in the context of users who visit the infected web page.
* A. XSRF (Cross-Site Request Forgery) attack: This involves tricking the user into performing actions on a different site without their knowledge but does not involve stealing cookies via script injection.
* B. Command injection: This involves executing arbitrary commands on the host operating system, which is not relevant to the given JavaScript code.
* C. Stored XSS: The provided code snippet matches the pattern of a stored XSS attack, where the script is injected into a web page, and when users visit the page, the script executes and sends the user's cookies to the attacker's server.
* D. SQL injection: This involves injecting malicious SQL queries into the database and is unrelated to the given JavaScript code.
References:
* CompTIA Security+ Study Guide
* OWASP (Open Web Application Security Project) guidelines on XSS
* "The Web Application Hacker's Handbook" by Dafydd Stuttard and Marcus Pinto
質問 # 29
A systems administrator wants to reduce the number of failed patch deployments in an organization. The administrator discovers that system owners modify systems or applications in an ad hoc manner. Which of the following is the best way to reduce the number of failed patch deployments?
- A. Change management
- B. Compliance tracking
- C. Quality assurance
- D. Situational awareness
正解:A
解説:
To reduce the number of failed patch deployments, the systems administrator should implement a robust change management process. Change management ensures that all modifications to systems or applications are planned, tested, and approved before deployment. This systematic approach reduces the risk of unplanned changes that can cause patch failures and ensures that patches are deployed in a controlled and predictable manner.
Reference:
CompTIA SecurityX Study Guide: Emphasizes the importance of change management in maintaining system integrity and ensuring successful patch deployments.
ITIL (Information Technology Infrastructure Library) Framework: Provides best practices for change management in IT services.
"The Phoenix Project" by Gene Kim, Kevin Behr, and George Spafford: Discusses the critical role of change management in IT operations and its impact on system stability and reliability.
質問 # 30
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