Master VMware 6V0-21.25: vDefend Security for VCF 5.x Practice Tests

Correct : A

VMware vDefend includes several pre-configured, built-in roles to enforce the principle of least privilege and separation of duties. Valid out-of-the-box built-in roles include Enterprise Admin, Network Admin, Security Admin, and Auditor. 'Privileged Admin' is a fabricated term in this context and is NOT a standard, built-in role within the vDefend RBAC architecture.

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Correct : B

In vDefend, tags are constructed using a key-value pair system comprised of a 'Scope' (the category) and a 'Tag' (the specific value). When automating security deployments via APIs or orchestration tools (like Aria Automation or Terraform), standardizing this structure is critical for dynamic grouping.

The best practice is to use the same scope (e.g., Scope = 'Zone') and assign a unique tag for each environment (e.g., Tag = 'Production', Tag = 'Dev', Tag = 'DMZ'). This allows an automation script to easily query the API by saying, 'Show me all objects where the Scope is 'Zone',' instantly retrieving the VMs across all your different infrastructure environments for reporting or dynamic firewall grouping.

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Correct : A

When creating Security Groups in vDefend, dynamic criteria (like VM Names, OS Names, or Security Tags---Options B, C, and D) are heavily preferred for internal workloads because vCenter and NSX have direct administrative control and visibility over those virtual machines.

However, External DNS servers reside outside of the vSphere/NSX compute boundary (they are often physical servers or managed by a separate network team). Because vDefend cannot assign a vSphere metadata tag or read the VM Name of an external physical server, dynamic grouping will fail. Therefore, the only technically viable and recommended method for grouping external infrastructure is to build an IP Set or Security Group and statically assign the IP addresses of those external resources.

Correct : D

The VMware vDefend (NSX) control plane is divided into two distinct components to ensure maximum scalability and resiliency: the Central Control Plane (CCP) and the Local Control Plane (LCP).

Central Control Plane (CCP): This resides logically on the NSX Manager cluster. It computes the overall network and security topology based on the administrator's intent.

Local Control Plane (LCP): This resides directly on every individual ESXi host (and Edge Node) as a daemon/service (specifically the nsx-proxy and netcpa agents). The CCP pushes the calculated state down to the LCP on the host. The LCP is then responsible for programming those specific rules directly into the host's Data Plane (the hypervisor kernel modules). By keeping an LCP on the ESXi host, the host can continue to enforce security rules and route traffic even if it temporarily loses connectivity to the central NSX Managers.

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Correct : A

The VMware vDefend Distributed Firewall (DFW) evaluates traffic against rules in a strict top-to-bottom order, stopping at the very first rule that matches the traffic flow. To help administrators organize these rules logically and prevent accidental lockouts, vDefend enforces a strict Category processing order from left to right in the UI (which translates to top-to-bottom in the data plane).

The correct processing sequence is:

Ethernet: Layer 2 MAC-based rules.

Emergency: Temporary quarantine or rapid-response block rules.

Infrastructure: Rules allowing foundational services (DNS, AD, vCenter, NTP).

Environment: Broad inter-zone rules (e.g., blocking Production from talking to Development).

Application: Granular micro-segmentation rules for specific app tiers (Web to App to DB).

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