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Determining the asset value of each system is the best action to perform first, as it helps to categorize and prioritize the systems based on the sensitivity of the data they host. The asset value is a measure of how important a system is to the organization, in terms of its financial, operational, or reputational impact. The asset value can help the security analyst to assign a risk level and a protection level to each system, and to allocate resources accordingly. The other actions are not as effective as determining the asset value, as they do not directly address the goal of promoting confidentiality, availability, and integrity of the data. Interviewing the users who access these systems may provide some insight into how the systems are used and what data they contain, but it may not reflect the actual value or sensitivity of the data from an organizational perspective. Scanning the systems to see which vulnerabilities currently exist may help to identify and remediate some security issues, but it does not help to categorize or prioritize the systems based on their data sensitivity. Configuring alerts for vendor-specific zero-day exploits may help to detect and respond to some emerging threats, but it does not help to protect the systems based on their data sensitivity.

Passive scanning is a method of vulnerability identification that does not send any packets or probes to the target devices, but rather observes and analyzes the network traffic passively. Passive scanning can minimize the risk of OT/ICS devices malfunctioning due to the vulnerability identification process, as it does not interfere with the normal operation of the devices or cause any network disruption. Passive scanning can also detect vulnerabilities that active scanning may miss, such as misconfigured devices, rogue devices or unauthorized traffic. Official References:

To decide what to address first, CySA+ expects a risk-based prioritization approach, combining factors like:

Asset criticality/value (business impact)

Exposure/architecture (internet-facing vs. isolated/internal)

Patch availability / ability to remediate quickly

Exploitability / likelihood of exploitation

1) Server5 (Critical + Patch Yes) — prioritize immediately

Server5 sits in the database network, is marked Critical, and a patch is available. That combination makes it one of the highest priorities because you can rapidly reduce risk on an asset with the greatest business impact.

Secbay explicitly states that prioritization should align to asset criticality and business impact, and also notes that patch availability accelerates remediation:Exact extract (Secbay Press): “Prioritize vulnerabilities based on their severity, exploitability, and potential impact… Asset Criticality: Identify and prioritize vulnerabilities based on the criticality of the assets they affect…” and “Patch Availability… Action: Prioritize vulnerabilities for which patches are readily available, as prompt remediation is possible.”

The All-in-One guide emphasizes asset value/criticality as a major driver of how fast you remediate:Exact extract (All-in-One Exam Guide): “Asset value is likely one of the most important factors in determining how quickly you should remediate vulnerabilities…”

2) Server3 (Perimeter + High) — address immediately (mitigate now, patch later)

Server3 is in the perimeter network and rated High, making it more exposed to attack paths than internal-only systems. Even though no patch is available, the analyst must still “address” it first via mitigation/compensating controls (segmentation, firewalling, disabling vulnerable services, WAF where relevant, tighter ACLs, etc.) because perimeter exposure increases likelihood of exploitation.

The All-in-One guide makes the architecture/exposure point very directly:Exact extract (All-in-One Exam Guide – Exam Tip): “The architecture of your infrastructure should be a factor… Internet-facing hosts with sensitive information will likely be your highest priority, while isolated systems… may be able to wait a bit longer for remediation.”

Secbay’s prioritization guidance also highlights focusing on critical/high impact risks first and using risk-based prioritization.

Why not the others (briefly):

Server4 (Internal, High, Patch Yes): This is a strong candidate, but when choosing only two, perimeter high exposure (Server3) plus critical database with patch (Server5) generally outranks an internal high system.

Server2 (Perimeter, Low, Patch Yes): Exposed, but Low criticality.

Server1 / Server6 (Medium, No patch): Lower criticality and no patch—typically handled after higher-risk items, or mitigated as feasible.

References (CompTIA CySA+ CS0-003 documents / study guides used):

Mya Heath et al., CompTIA CySA+ All-in-One Exam Guide (CS0-003): infrastructure architecture affects remediation priority; internet-facing hosts are typically highest priority; asset value drives remediation urgency

Secbay Press, CompTIA CySA+ Exam Prep Guide (CS0-003): vulnerability prioritization factors include asset criticality and patch availability; prioritize items with readily available patches for prompt remediation

Comprehensive Detailed Explanation:The most effective and economical way to ensure the security of an automated information system is to design it with security in mind from the outset. This is often referred to as " security by design. " Here’s a breakdown of each option and why option A is correct:

A. Originally designed to provide necessary security

Explanation: Systems designed with security from the beginning integrate secure practices and considerations during the development process. This approach mitigates the need for costly and complex retroactive security implementations, which are common in systems where security was an afterthought.

Cost Efficiency: Security implementations at the design stage can be embedded into the system architecture, reducing the costs associated with later modifications.

Effectiveness: Security-by-design approaches often result in robust systems that are more resilient to vulnerabilities because they address security concerns at each development phase.

B. Subjected to intense security testing

While rigorous security testing (such as penetration testing and vulnerability assessments) is essential, it is reactive. Security testing is more effective when applied to systems already designed with foundational security principles, ensuring that tests identify potential flaws in an inherently secure system.

C. Customized to meet specific security threats

Customizing security to meet specific threats addresses unique risks, but such a targeted approach may miss new or emerging threats not initially considered. It also risks neglecting fundamental security practices that apply universally, leading to potential vulnerabilities.

D. Optimized prior to the addition of security

Optimizing a system before adding security features may enhance performance but does not guarantee security. Security cannot be effectively added onto a system as an afterthought without incurring additional costs or creating potential weaknesses.