The troubleshooting methodology requires following a logical sequence. In this case, the engineer has already identified the problem (firewall blocking traffic) and confirmed it with evidence (packet captures). The next appropriate step is to create a plan of action that outlines how to resolve the issue and considers potential effects.
A . Implementing the solution is premature without planning.
C . Establishing a theory was already completed during problem isolation.
D . Documentation occurs after resolution.
By carefully planning, the engineer ensures that corrective action won't cause additional outages or security issues, especially given the scale of the incident (3,000 users).

Comprehensive and Detailed Explanation (paraphrased, aligned to N10-009):
An evil twin is a malicious wireless access point that impersonates a legitimate SSID. Once victims connect, the attacker can intercept and manipulate traffic, performing an on-path (man-in-the-middle) attack-capturing credentials, injecting content, or downgrading encryption.
B . DDoS overwhelms services with traffic; it's not the typical follow-on from clients joining a rogue AP.
C . ARP spoofing is another way to become on-path on wired segments, but with an evil twin, the wireless association itself enables the on-path position.
D . Phishing is social engineering; while an evil twin could be used to present fake portals, the primary technical posture after connection is on-path.
Reference (CompTIA Network+ N10-009):
Domain: Network Security - Wireless threats (rogue APs/evil twins), traffic interception, on-path attacks.

NAT (Network Address Translation) helps hide internal IP addresses from external networks, adding a layer of security by preventing direct access to internal systems from the outside.

Multitenancy is a cloud computing architecture where a single instance of software serves multiple customers or tenants. Each tenant's data is isolated and remains invisible to other tenants. Hosting a company application in the cloud to be available for both internal and third-party users fits this concept, as it allows shared resources and infrastructure while maintaining data separation and security. Reference: CompTIA Network+ Exam Objectives and official study guides.

A baseline establishes normal performance levels for network utilization, latency, jitter, and other metrics. After a merger, traffic patterns change, so a new baseline is needed to recalibrate monitoring thresholds and avoid excessive false alerts.
A . SLA defines performance agreements with customers but doesn't adjust alerting.
B . Network diagrams show topology, not traffic norms.
D . Heat maps show wireless coverage, not utilization baselines.
Reference (CompTIA Network+ N10-009):