What makes this a strong certification question is that several answers look technically related, but only one aligns with the exact behavior of Flow networking or Flow security. The correct response is D, meaning
"Create categories for each tier then define an Application Policy allowing specific ports between them.".
Application Policies are the most appropriate way to model legitimate workload communication in a tiered application. They allow administrators to express which sources, destinations, and services are required instead of relying on broad network access. This is a Flow policy design question, so categories, secured entities, rule direction, policy mode, and policy precedence matter more than simple IP connectivity assumptions.
Notice that A does not fit because it targets a different layer of the Nutanix networking and security stack than the one causing the outcome here. B sounds plausible, but it does not align with the specific Flow policy object or precedence rule that controls this case. That is the underlying Nutanix principle being validated:
solve the issue at the feature that owns the behavior, not by changing unrelated infrastructure settings that happen to sound network-oriented.

From a Nutanix exam perspective, this question is really testing whether the administrator understands the control point that actually governs the behavior shown in the scenario. The correct response is B, meaning
"Apply a Security policy in Monitor mode to discover all traffic between the application tiers.". Monitor mode is designed for observation rather than enforcement. In Nutanix Flow, it discovers and visualizes matching traffic so an administrator can validate real application behavior before converting the policy to active enforcement. That is why the correct response focuses on visibility, not blocking. Enforce mode is the stage where Flow stops acting like a discovery tool and starts behaving like a stateful control point. Traffic allowed by the policy continues normally, while traffic that does not match an allowed rule is denied according to policy logic. This is a Flow policy design question, so categories, secured entities, rule direction, policy mode, and policy precedence matter more than simple IP connectivity assumptions. By contrast, A does not fit because it targets a different layer of the Nutanix networking and security stack than the one causing the outcome here. C sounds plausible, but it does not align with the.

A reliable method here is to translate the scenario into Nutanix terms-VPC routing, external connectivity, policy scope, identity mapping, or upgrade readiness-and then choose the answer that directly addresses that domain. The correct response is C, meaning "Check the security policies again to ensure that the rule allowing port 3306 from Web - > Database is applied and active, then check the policy enforcement mode to ensure it is in Enforcement Mode.". The winning option is the one tied to the native Nutanix object or control that governs the outcome described in the scenario. From a troubleshooting standpoint, the validation path is policy scope first, then categories or identity mapping, then hitlog evidence, service definition, and finally policy precedence. Seen from a design perspective, the correct answer is the least ambiguous and most supportable implementation path inside Prism Central and AHV. Notice that A does not fit because it targets a different layer of the Nutanix networking and security stack than the one causing the outcome here. B sounds plausible, but it does not align with the specific Flow policy object or precedence rule that controls this case.
The key takeaway is that Flow is intentionally.

The clean way to read this scenario is to separate what is merely present in the environment from the single Nutanix construct that actually satisfies the requirement. The correct response is B, meaning "Monitor". The winning option is the one tied to the native Nutanix object or control that governs the outcome described in the scenario. This is a Flow policy design question, so categories, secured entities, rule direction, policy mode, and policy precedence matter more than simple IP connectivity assumptions.
Notice that A does not fit because it targets a different layer of the Nutanix networking and security stack than the one causing the outcome here. C does not fit because it targets a different layer of the Nutanix networking and security stack than the one causing the outcome here. In practice, administrators who anchor their decisions to Prism Central constructs-such as VPCs, external networks, ERPs, categories, and policy modes-arrive at the correct answer faster and avoid unnecessary changes.

The clean way to read this scenario is to separate what is merely present in the environment from the single Nutanix construct that actually satisfies the requirement. The correct response is C, meaning "Security Policy Hit logs". The winning option is the one tied to the native Nutanix object or control that governs the outcome described in the scenario. This is a Flow policy design question, so categories, secured entities, rule direction, policy mode, and policy precedence matter more than simple IP connectivity assumptions. A strong exam habit is to ask which Nutanix construct would have to change for the symptom or requirement to change. That mental shortcut usually separates the real answer from distractors that mention generic networking steps, disruptive resets, or unrelated configuration objects.
Notice that A does not fit because it targets a different layer of the Nutanix networking and security stack than the one causing the outcome here. B does not fit because it targets a different layer of the Nutanix networking and security stack than the one causing the outcome here. That is the underlying Nutanix principle being validated: solve the issue at the feature that owns the behavior, not by changing unrelated infrastructure settings that happen to sound network-oriented.