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NEW QUESTION # 70
What does non-repudiation mean in the context of web security?
Answer: D
Explanation:
Non-repudiation is a security property that provides verifiable evidence of an action or communication so that the parties involved cannot credibly deny their participation later. In web security, it most commonly means being able to prove who sent a message or performed a transaction and, in many cases, that the message was received and recorded. This is why option D is correct: it captures the idea of giving the receiver proof of the sender's identity and giving the sender evidence that the message or transaction was delivered or accepted.
Cybersecurity guidance typically associates non-repudiation with digital signatures, strong identity binding, and protected audit evidence. A digital signature uses asymmetric cryptography so that only the holder of a private key can sign, while anyone with the public key can verify the signature. When combined with trusted certificates, accurate time sources, and protected logs, this creates strong accountability. Non-repudiation also depends on maintaining the integrity of supporting evidence, such as tamper-resistant audit logs, secure log retention, and controlled access to signing keys.
It is different from confidentiality (encryption of traffic), and different from integrity alone (preventing unauthorized modification). It is also different from authorization and auditing, which support accountability but do not, by themselves, provide cryptographic-grade proof that a specific entity performed a specific action. Non-repudiation is especially important for high-trust transactions such as approvals, payments, and legally binding communications.
NEW QUESTION # 71
What stage of incident management would "strengthen the security from lessons learned" fall into?
Answer: C
Explanation:
"Strengthen the security from lessons learned" fits the remediation stage because it focuses on eliminating root causes and improving controls so the same incident is less likely to recur. In incident management lifecycles, response is about immediate actions to contain and manage the incident (triage, containment, eradication actions in progress, communications, and preserving evidence). Detection is the identification and confirmation stage (alerts, analysis, validation, and initial classification). Recovery is restoring services to normal operation and verifying stability, including bringing systems back online, validating data integrity, and meeting recovery objectives.
After the environment is stable, organizations conduct a post-incident review and then implement corrective and preventive actions. That work is remediation: closing exploited vulnerabilities, hardening configurations, rotating credentials and keys, tightening access and privileged account controls, improving monitoring and logging coverage, updating firewall rules or segmentation, refining secure development practices, and correcting process gaps such as weak change management or incomplete asset inventory. Remediation also includes updating policies and playbooks, enhancing detection rules based on observed attacker techniques, and training targeted groups if human factors contributed.
Cybersecurity guidance emphasizes documenting lessons learned, assigning owners and deadlines, validating fixes, and tracking completion because "lessons learned" without implemented change does not reduce risk. The defining characteristic is durable improvement to the control environment, which is why this activity belongs to remediation rather than response, detection, or recovery.
NEW QUESTION # 72
Which scenario is an example of the principle of least privilege being followed?
Answer: C
Explanation:
The principle of least privilege requires that users, administrators, services, and applications are granted only the minimum access necessary to perform authorized job functions, and nothing more. Option A follows this principle because the administrator's elevated permissions are limited in scope to the specific applications they are responsible for supporting. This reduces the attack surface and limits blast radius: if that administrator account is compromised, the attacker's reach is constrained to only those applications rather than the entire enterprise environment.
Least privilege is typically implemented through role-based access control, separation of duties, and privileged access management practices. These controls ensure privileges are assigned based on defined roles, reviewed regularly, and removed when no longer required. They also promote using standard user accounts for routine tasks and reserving administrative actions for controlled, auditable sessions. In addition, least privilege supports stronger accountability through logging and change tracking, because fewer people have the ability to make high-impact changes across systems.
The other scenarios violate least privilege. Option B grants excessive enterprise-wide permissions, creating unnecessary risk and enabling widespread damage from mistakes or compromise. Option C provides "just in case" administrative access, which cybersecurity guidance explicitly discourages because it increases exposure without a validated business need. Option D is overly broad because access to all HR files exceeds what is required for performance appraisals, which typically should be limited to relevant employee records only.
NEW QUESTION # 73
Separation of duties, as a security principle, is intended to:
Answer: D
Explanation:
Separation of duties is a foundational access-control and governance principle designed to reduce the likelihood of misuse, fraud, and significant mistakes by ensuring that no single individual can complete a critical process end-to-end without independent oversight. Cybersecurity and audit frameworks describe this as splitting high-risk activities into distinct roles so that one person's actions are checked or complemented by another person's authority. This limits both intentional abuse, such as unauthorized payments or data manipulation, and unintentional errors, such as misconfigurations or accidental deletion of important records.
In practice, separation of duties is implemented by defining roles and permissions so that incompatible functions are not assigned to the same account. Common examples include separating the ability to create a vendor from the ability to approve payments, separating software development from production deployment, and separating system administration from security monitoring or audit log management. This is reinforced through role-based access control, approval workflows, privileged access management, and periodic access reviews that detect conflicting entitlements and privilege creep.
The value of separation of duties is risk reduction through accountability and control. When actions require multiple parties or independent review, it becomes harder for a single compromised account or malicious insider to cause large harm without detection. It also improves reliability by introducing checkpoints that catch mistakes earlier. Therefore, the correct purpose is to prevent fraud and error.
NEW QUESTION # 74
NIST 800-30 defines cyber risk as a function of the likelihood of a given threat-source exercising a potential vulnerability, and:
Answer: A
Explanation:
NIST SP 800-30 describes risk using a classic risk model: risk is a function of likelihood and impact. In this model, a threat-source may exploit a vulnerability, producing a threat event that results in adverse consequences. The likelihood component reflects how probable it is that a threat event will occur and successfully cause harm, considering factors such as threat capability and intent (or in non-adversarial cases, the frequency of hazards), the existence and severity of vulnerabilities, exposure, and the strength of current safeguards. However, likelihood alone does not define risk; a highly likely event that causes minimal harm may be less important than a less likely event that causes severe harm.
The second required component is the impact-the magnitude of harm to the organization if the adverse event occurs. Impact is commonly evaluated across mission and business outcomes, including financial loss, operational disruption, legal or regulatory consequences, reputational damage, and loss of confidentiality, integrity, or availability. This is why option D is correct: NIST's definition explicitly ties the risk expression to the resulting impact on the organization.
The other options may influence likelihood assessment or control selection, but they are not the missing definitional element. Detection probability and control assurance relate to monitoring and governance; predisposing conditions can shape likelihood. None replace the
NEW QUESTION # 75
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