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質問 # 14
Which scenario is an example of the principle of least privilege being followed?
正解：B
解説：
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.
質問 # 15
Which of the following factors is most important in determining the classification of personal information?
正解：B
解説：
Personal information is classified primarily based on the harm that could result from unauthorized disclosure, which maps directly to the confidentiality objective. Cybersecurity and privacy governance frameworks treat personal data as sensitive because exposure can lead to identity theft, fraud, discrimination, personal safety risks, and loss of privacy. Organizations also face regulatory penalties, contractual consequences, and reputational damage when personal data is disclosed without authorization. For this reason, when determining classification, the first and most influential question is typically: "What is the impact if this data becomes known to someone who should not have it?" That impact assessment drives the required protection level and handling rules.
Confidentiality-focused controls then follow from the classification decision, including least privilege and role-based access, strong authentication, encryption at rest and in transit, secure key management, data loss prevention where appropriate, logging and monitoring of access to sensitive records, and strict sharing/transfer procedures.
Integrity and availability matter for personal information, but they are usually secondary in classification decisions. Integrity affects trustworthiness and correctness (for example, incorrect medical or payroll data), and availability affects the ability to access records when needed. However, the defining sensitivity of personal information is that it must not be disclosed improperly. "Accessibility" is not a core security objective used in standard classification models; it is an operational usability concept that is managed through access design after sensitivity is established.
質問 # 16
The opportunity cost of increased cybersecurity is that:
正解：A
解説：
Opportunity cost is a core enterprise-risk and economics concept: when an organization allocates limited resources to one activity, it reduces what is available for other priorities. Increasing cybersecurity typically requires money, skilled personnel time, executive attention, tooling, and operational capacity. Those resources could otherwise be used for revenue-generating work such as new product features, customer experience improvements, system modernization, market expansion, or process automation. That tradeoff is exactly what option D describes, making it the correct answer.
Cybersecurity documents stress that risk treatment decisions must balance risk reduction against cost, feasibility, and business impact. While stronger security can reduce the likelihood and impact of incidents, it can also introduce friction (extra approval steps, stronger authentication, segmentation), slow delivery when changes require additional reviews, and demand ongoing operational effort (monitoring, patching, vulnerability remediation, access recertification, incident response testing). These impacts are not arguments against security; they are the reason governance processes prioritize controls based on the most critical assets, highest-risk threats, and compliance requirements.
Option A may be true in some cases, but it describes a direct cost, not the broader economic concept of opportunity cost. Option B is a trend statement and not the definition. Option C is incorrect because security spend is not always less than breach risk; organizations must evaluate cost-benefit and acceptable residual risk rather than assume a universal rule.
質問 # 17
What business analysis deliverable would be an essential input when designing an audit log report?
正解：D
解説：
Designing an audit log report requires clarity on who is allowed to do what, which actions are considered security-relevant, and what evidence must be captured to demonstrate accountability. Access Control Requirements are the essential business analysis deliverable because they define roles, permissions, segregation of duties, privileged functions, approval workflows, and the conditions under which access is granted or denied. From these requirements, the logging design can specify exactly which events must be recorded, such as authentication attempts, authorization decisions, privilege elevation, administrative changes, access to sensitive records, data exports, configuration changes, and failed access attempts. They also help determine how logs should attribute actions to unique identities, including service accounts and delegated administration, which is critical for auditability and non-repudiation.
Access control requirements also drive necessary log fields and report structure: user or role, timestamp, source, target object, action, outcome, and reason codes for denials or policy exceptions. Without these requirements, an audit log report can become either too sparse to support investigations and compliance, or too noisy to be operationally useful.
A risk log can influence priorities, but it does not define the authoritative set of access events and entitlements that must be auditable. A future state process can provide context, yet it is not as precise as access rules for determining what to log. An internal audit report may highlight gaps, but it is not the primary design input compared to formal access control requirements.
質問 # 18
Public & Private key pairs are an example of what technology?
正解：D
解説：
Public and private key pairs are the foundation of asymmetric encryption, also called public key cryptography. In this model, each entity has two mathematically related keys: a public key that can be shared widely and a private key that must be kept secret. The keys are designed so that what one key does, only the other key can undo. This enables two core security functions used throughout cybersecurity architectures.
First, confidentiality: data encrypted with a recipient's public key can only be decrypted with the recipient's private key. This allows secure communication without having to share a secret key in advance, which is especially important on untrusted networks like the internet. Second, digital signatures: a sender can sign data with their private key, and anyone can verify the signature using the sender's public key. This provides authenticity (proof the sender possessed the private key), integrity (the data was not altered), and supports non-repudiation when combined with proper key custody and audit practices.
These mechanisms underpin widely used security controls such as TLS for secure web connections, secure email standards, code signing, and certificate-based authentication. A VPN may use public key cryptography during key exchange, but the key pair itself is specifically an encryption technology. IoT and network segregation are unrelated categories.
質問 # 19
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