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Q141. What is the primary purpose of a security information and event management (SIEM) system?

1. To collect, correlate, and analyze security events
   2. To replace all network firewalls
   3. To create user passwords
   4. To physically secure servers

Correct Answer: 1. To collect, correlate, and analyze security events

Explanation:
A SIEM system is designed to centralize security-related information from many sources, including servers, endpoints, network devices, applications, and security controls. It collects logs and events and then correlates related activities to help security teams identify suspicious patterns. This centralized visibility is valuable because individual systems may only show a small part of an attack. By combining information from multiple sources, a SIEM can help analysts investigate incidents, detect threats, generate alerts, and support compliance requirements. SIEM platforms can also provide dashboards and reporting capabilities that help security operations teams understand the overall security posture of an organization.

Q142. What is the main function of a firewall in network security?

1. To filter and control network traffic based on security rules
   2. To store employee documents
   3. To create application source code
   4. To manage payroll information

Correct Answer: 1. To filter and control network traffic based on security rules

Explanation:
A firewall helps protect a network by inspecting network traffic and applying predefined security policies. These policies determine which connections should be allowed or denied based on factors such as source, destination, port, protocol, application, or user identity. Firewalls can help prevent unauthorized access and reduce exposure to potentially malicious traffic. Modern firewalls may also provide advanced capabilities such as application identification, threat prevention, URL filtering, and user-based policy enforcement. In a security operations environment, firewall logs can provide important evidence during investigations because they show connection attempts and traffic patterns that may indicate scanning, exploitation, or other suspicious activity.

Q143. What is the purpose of endpoint detection and response (EDR)?

1. To monitor endpoints and investigate suspicious activity
   2. To manage physical building access
   3. To replace database backups
   4. To configure employee salaries

Correct Answer: 1. To monitor endpoints and investigate suspicious activity

Explanation:
EDR solutions continuously monitor endpoint devices such as laptops, desktops, and servers for potentially suspicious behavior. They collect information about processes, files, network connections, user activity, and other endpoint events. Security analysts can use this information to investigate possible compromises and determine what occurred on an affected system. EDR platforms may also provide response capabilities, such as isolating a device from the network or terminating a malicious process. This makes EDR an important component of security operations because it provides visibility into endpoint activity and helps organizations detect, investigate, contain, and respond to threats more effectively.

Q144. What is the main goal of threat hunting?

1. To proactively search for threats that may have avoided automated detection
   2. To install office applications
   3. To manage employee attendance
   4. To increase internet bandwidth

Correct Answer: 1. To proactively search for threats that may have avoided automated detection

Explanation:
Threat hunting is a proactive security activity in which analysts actively search an environment for evidence of malicious or suspicious behavior. Instead of waiting for an automated alert, threat hunters use security data, threat intelligence, behavioral indicators, and hypotheses to investigate possible threats. They may search endpoint activity, authentication events, network traffic, and other sources for unusual patterns. Threat hunting is valuable because attackers may sometimes remain undetected by traditional security controls. A successful hunt can uncover previously unknown activity, improve detection rules, identify weaknesses in monitoring, and provide additional information that can help strengthen an organization’s overall security defenses.

Q145. What is an indicator of compromise (IOC)?

1. A piece of evidence that may indicate a security compromise
   2. A method for increasing storage capacity
   3. A type of employee identification card
   4. A database backup schedule

Correct Answer: 1. A piece of evidence that may indicate a security compromise

Explanation:
An indicator of compromise is observable evidence that may suggest a system or environment has been affected by malicious activity. Examples can include suspicious IP addresses, malicious domains, unusual file hashes, unauthorized files, unexpected processes, or abnormal network connections. Security teams can use IOCs during detection and investigation activities to search systems for signs of known threats. However, an IOC by itself may not always prove that an attack occurred, so analysts generally evaluate it together with other evidence and contextual information. IOC-based detection can help security teams identify known malicious activity and accelerate the investigation of potential incidents.

Q146. What is the purpose of security orchestration?

1. To coordinate security tools and automate response workflows
   2. To manually configure every security device
   3. To replace all authentication systems
   4. To remove security monitoring

Correct Answer: 1. To coordinate security tools and automate response workflows

Explanation:
Security orchestration involves coordinating multiple security technologies so that they can work together as part of an organized workflow. Security teams often use many different tools, such as firewalls, endpoint protection systems, SIEM platforms, threat intelligence services, and ticketing systems. Orchestration can connect these technologies and allow information or actions to move between them automatically. For example, when a suspicious IP address is identified, an automated workflow could check threat intelligence, update a security control, create an investigation ticket, and notify analysts. This approach reduces manual work, improves consistency, and can significantly reduce response time during security incidents.

Q147. What is the primary purpose of an access control list (ACL)?

1. To define which traffic or users are permitted or denied access
   2. To compress log files
   3. To scan physical devices for malware
   4. To create security awareness training

Correct Answer: 1. To define which traffic or users are permitted or denied access

Explanation:
An access control list is a collection of rules that determines whether specific traffic or access requests should be permitted or denied. ACLs are commonly used on network devices, firewalls, and other security controls. Rules may evaluate information such as source addresses, destination addresses, ports, and protocols. Properly configured ACLs can reduce unauthorized access and restrict unnecessary communication between systems. Security administrators should carefully design ACL rules because overly permissive rules can create security risks, while overly restrictive rules may disrupt legitimate business operations. Regular review is important to ensure that access remains aligned with current security requirements.

Q148. What is the principle of least privilege?

1. Giving users and systems only the access necessary to perform their tasks
   2. Giving every employee administrator privileges
   3. Removing all authentication requirements
   4. Allowing unrestricted network access

Correct Answer: 1. Giving users and systems only the access necessary to perform their tasks

Explanation:
The principle of least privilege requires users, applications, and systems to receive only the permissions they need to perform authorized activities. Providing excessive privileges increases the potential impact of compromised accounts or malicious activity. For example, a standard employee who only needs to read certain documents should not automatically receive administrator privileges. Least privilege can reduce the attack surface and limit lateral movement if an account or device is compromised. Security teams should regularly review permissions and remove unnecessary access. Combining least privilege with strong authentication, monitoring, and privileged access management can provide an additional layer of protection.

Q149. What is multi-factor authentication (MFA)?

1. Authentication using two or more different verification factors
   2. Authentication using only a username
   3. Authentication without any credentials
   4. Authentication using only a single password

Correct Answer: 1. Authentication using two or more different verification factors

Explanation:
Multi-factor authentication requires users to provide multiple types of evidence when proving their identity. Common authentication factors include something the user knows, such as a password; something the user has, such as a security token or mobile device; and something the user is, such as a biometric characteristic. MFA improves account security because compromising one factor may not be enough for an attacker to gain access. For example, a stolen password may be insufficient if the attacker also needs a verification code from a registered device. Security teams commonly recommend MFA for remote access, privileged accounts, cloud services, and other sensitive resources.

Q150. What is the primary purpose of vulnerability scanning?

1. To identify known security weaknesses in systems and applications
   2. To create employee performance reports
   3. To replace all security policies
   4. To encrypt every network packet

Correct Answer: 1. To identify known security weaknesses in systems and applications

Explanation:
Vulnerability scanning is used to identify known weaknesses in systems, applications, network devices, and other assets. Scanners may examine software versions, configurations, exposed services, and other characteristics and compare their findings against known vulnerability information. The results can help security teams determine which systems require remediation and which vulnerabilities may present the greatest risk. Vulnerability scanning is an important part of vulnerability management, but scanning alone does not eliminate security weaknesses. Organizations should validate findings, prioritize vulnerabilities based on risk, apply appropriate fixes or mitigations, and perform follow-up scans to confirm that vulnerabilities have been addressed.

Q151. What is the purpose of a security incident response plan?

1. To define procedures for detecting, responding to, and recovering from incidents
   2. To document employee vacation schedules
   3. To replace network security controls
   4. To create marketing strategies

Correct Answer: 1. To define procedures for detecting, responding to, and recovering from incidents

Explanation:
A security incident response plan provides an organized approach for handling cybersecurity incidents. It typically describes responsibilities, communication procedures, escalation requirements, investigation steps, containment actions, recovery activities, and post-incident review processes. Having a documented plan helps organizations respond consistently rather than making decisions from scratch during a stressful incident. It can also identify who should be contacted, which systems may need to be isolated, and how evidence should be handled. Regular testing and updating are important because environments, threats, personnel, and business requirements can change over time. A well-maintained plan can improve coordination and reduce the potential impact of security incidents.

Q152. What is the main purpose of incident containment?

1. To limit the spread and impact of a security incident
   2. To permanently delete all system logs
   3. To increase network bandwidth
   4. To disable all security controls

Correct Answer: 1. To limit the spread and impact of a security incident

Explanation:
Incident containment focuses on preventing a security incident from spreading or causing additional damage. Depending on the situation, containment actions may include isolating a compromised endpoint, blocking malicious network traffic, disabling a compromised account, or restricting access to affected systems. The objective is to control the situation while allowing security teams to continue investigation and prepare for eradication and recovery. Containment decisions should consider business requirements because shutting down systems may affect legitimate operations. Effective containment requires clear procedures, appropriate authorization, and coordination between security, IT, and other relevant teams.

Q153. What is data loss prevention (DLP) designed to help prevent?

1. Unauthorized disclosure or transfer of sensitive information
   2. Unauthorized installation of operating systems only
   3. Hardware overheating
   4. Network cable failures

Correct Answer: 1. Unauthorized disclosure or transfer of sensitive information

Explanation:
Data loss prevention technologies help organizations identify, monitor, and protect sensitive information from unauthorized disclosure or transfer. DLP controls can examine data stored on systems, data moving across networks, and data being used by applications or users. Policies may identify sensitive information such as financial records, confidential business documents, or personally identifiable information. Depending on the configuration, a DLP solution may alert security teams, block an action, or require additional authorization when a policy violation occurs. DLP is especially useful for reducing the risk of accidental data exposure, insider threats, and unauthorized movement of sensitive information.

Q154. What is network segmentation used for?

1. To divide a network into separate security zones
   2. To increase the physical size of a network
   3. To remove all network authentication
   4. To eliminate security monitoring

Correct Answer: 1. To divide a network into separate security zones

Explanation:
Network segmentation divides an organization’s network into separate areas or security zones. This can help limit communication between systems and reduce the potential impact of a compromised device. For example, sensitive servers can be placed in a protected segment with restricted access from ordinary user networks. Segmentation can also help separate production systems, guest networks, administrative environments, and other infrastructure according to security requirements. If an attacker compromises one segment, properly designed segmentation can make it more difficult to move laterally into other areas. Security teams can enforce segmentation using firewalls, access controls, routing policies, and other network security technologies.

Q155. What is a false positive in security monitoring?

1. Benign activity incorrectly identified as malicious
   2. Malicious activity that was successfully detected
   3. A confirmed security breach
   4. A missing security log

Correct Answer: 1. Benign activity incorrectly identified as malicious

Explanation:
A false positive occurs when a security system identifies legitimate or harmless activity as potentially malicious. For example, a normal administrative operation might trigger an alert because its behavior resembles a known attack pattern. False positives can create a significant workload for security analysts because each alert may require investigation. If alert volumes become too high, analysts may experience alert fatigue and potentially overlook important threats. Security teams can reduce false positives by tuning detection rules, adding appropriate exceptions, improving data quality, and incorporating contextual information. Effective alert tuning helps security operations teams focus their attention on events that represent meaningful risk.

Q156. What is a false negative in cybersecurity?

1. Malicious activity that a security control fails to detect
   2. Legitimate activity correctly allowed by a security policy
   3. A successfully blocked attack
   4. A completed security investigation

Correct Answer: 1. Malicious activity that a security control fails to detect

Explanation:
A false negative occurs when malicious activity is present but a security control does not identify it as a threat. False negatives are particularly concerning because they can allow attackers to continue operating without generating an alert. For example, a malicious process could execute on an endpoint without being detected by existing security rules. Security teams can reduce false negatives by improving detection logic, updating threat intelligence, conducting threat hunting, tuning monitoring systems, and regularly testing security controls. Unlike false positives, which can create excessive alerts, false negatives can allow real threats to remain hidden and potentially increase the impact of an incident.

Q157. What is lateral movement in a cyberattack?

1. Moving from one compromised system to another within an environment
   2. Encrypting a single backup file
   3. Installing an approved software update
   4. Creating a normal user account

Correct Answer: 1. Moving from one compromised system to another within an environment

Explanation:
Lateral movement occurs when an attacker moves from an initially compromised system to additional systems or resources within an environment. After gaining an initial foothold, an attacker may attempt to obtain credentials, exploit additional systems, access shared resources, or use legitimate administrative tools to reach more valuable targets. Lateral movement is dangerous because it can allow an attacker to expand access and reach sensitive systems. Security teams can reduce this risk through network segmentation, least privilege, strong authentication, endpoint monitoring, and careful management of administrative credentials. Detecting unusual authentication patterns and unexpected internal connections can also help identify lateral movement.

Q158. What is data exfiltration?

1. Unauthorized transfer of data from an organization or system
   2. Authorized data backup to a secure location
   3. Routine software installation
   4. Normal user authentication

Correct Answer: 1. Unauthorized transfer of data from an organization or system

Explanation:
Data exfiltration is the unauthorized removal or transfer of information from an organization, system, or network. Attackers may attempt to steal sensitive business information, credentials, customer records, intellectual property, or other valuable data. Exfiltration can occur through network connections, cloud services, removable media, email, or other channels. Security teams can use network monitoring, endpoint detection, DLP controls, access restrictions, and behavioral analysis to identify suspicious data transfers. Investigators may examine unusual outbound connections, unexpected file transfers, abnormal account activity, and large data movements. Preventing data exfiltration requires both strong access controls and continuous monitoring of sensitive information.

Q159. What is the primary purpose of security logging?

1. To record security-relevant activities for monitoring and investigation
   2. To automatically repair every vulnerability
   3. To replace endpoint protection
   4. To increase processor speed

Correct Answer: 1. To record security-relevant activities for monitoring and investigation

Explanation:
Security logging records events and activities that may be useful for monitoring, troubleshooting, auditing, and incident investigation. Logs can contain information about authentication attempts, network connections, system changes, application activity, administrative actions, and security alerts. Centralized and properly retained logs can help analysts reconstruct what happened during a security incident and identify suspicious behavior. Log quality is important because incomplete or poorly configured logging can make investigations difficult. Organizations should determine which events are important, protect logs from unauthorized modification, establish appropriate retention periods, and regularly review logging coverage to ensure that critical systems generate useful security information.

Q160. What is the main purpose of a security operations center (SOC)?

1. To continuously monitor, detect, investigate, and respond to security threats
   2. To manage employee payroll
   3. To design company advertisements
   4. To maintain office furniture

Correct Answer: 1. To continuously monitor, detect, investigate, and respond to security threats

Explanation:
A Security Operations Center, or SOC, is responsible for coordinating an organization’s security monitoring and response activities. SOC analysts typically monitor alerts and security events from technologies such as SIEM platforms, endpoint security systems, firewalls, and network monitoring tools. They investigate suspicious activity, determine whether incidents are genuine, escalate serious events, and support containment and recovery efforts. A SOC may also perform threat hunting, detection engineering, vulnerability monitoring, and security reporting. The overall objective is to maintain continuous visibility into the organization’s security environment and respond quickly when potential threats or incidents are identified.