Quiz 2026 VMware 6V0-21.25: Trustable Practice VMware vDefend Security for VCF 5.x Administrator Exams

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VMware 6V0-21.25 Exam Syllabus Topics:

Section	Objectives
Monitoring, Troubleshooting, and Operations	- Security event monitoring and logging 1. Performance and issue troubleshooting 2. Alerting and reporting
vDefend Security Architecture and Components	- VMware vDefend architecture overview 1. Core components and service dependencies 2. Security services integration in VCF
Advanced Threat Prevention	- Intrusion Detection and Prevention (IDS/IPS) 1. Signature-based threat detection 2. Behavior-based analysis and anomaly detection
Micro-segmentation and Distributed Firewall	- Security policy design and enforcement 1. Distributed firewall rules and groups 2. Application-based segmentation
Deployment and Configuration	- vDefend installation and initial setup 1. Integration with VMware Cloud Foundation 2. Licensing and prerequisites

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VMware vDefend Security for VCF 5.x Administrator Sample Questions (Q13-Q18):

NEW QUESTION # 13
Which statement best describes the vDefend firewall's distributed architecture?
Response:

A. Security rules are applied only to north-south traffic from external clients
B. Policies are enforced at the physical network core to minimize processing load
C. It enables consistent policy enforcement by applying rules at each VM's vNIC level
D. It relies on dedicated hardware firewalls to offload inspection tasks

Answer: C

NEW QUESTION # 14
Which of the following is true regarding VMware vDefend security solutions?

A. Provides decentralized control
B. Requires logical networking components from VMware Cloud Foundation
C. Eliminates the needs for additional security controls
D. Scales linearly with the data center

Answer: D

Explanation:
The fundamental architectural advantage of a software-defined, distributed security model like VMware vDefend is its scalability. In a legacy hardware environment, if your data center traffic doubles, you must purchase and rack larger, more expensive physical firewalls to handle the choke point.
Because vDefend's Distributed Firewall and Distributed IDS run directly inside the hypervisor on every host, the security capacity scales linearly. Every time you add a new ESXi server to your vSphere cluster to increase compute capacity, you automatically and proportionally add more firewall throughput and inspection capacity to the environment without creating a centralized bottleneck. (Note: Control remains centralized via the NSX Manager, making Option B false).

NEW QUESTION # 15
You need to build a security group that references External DNS servers. Which of the following is the best way to build the Security group?

A. Build a Security Group that uses OS Name to assign membership to the group
B. Build a Security Group that uses a specific tag name. Assign that tag to each respective DNS server
C. Build a Security Group and statically assign the IP addresses of the DNS servers
D. Build a Security Group that uses VM Name to assign membership to the group

Answer: C

Explanation:
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.

NEW QUESTION # 16
How does the zero-trust security model apply to private cloud data centers?
Response:

A. By using a perimeter firewall to secure the virtual environment
B. By eliminating the need for firewall policies altogether
C. By enforcing verification and least-privilege access at every level
D. By automatically allowing all north-south traffic

Answer: C

NEW QUESTION # 17
Which inspection method is used by NSX Malware Prevention to identify zero-day threats?
Response:

A. Behavioral analysis in a cloud-based sandbox
B. Static signature-only matching
C. vSphere Lifecycle Enforcement
D. Host-based file system scanning

Answer: A

NEW QUESTION # 18
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