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  1. Home
  2. VMware Certification
  3. 3V0-25.25 Exam
  4. VMware.3V0-25.25.v2026-04-27.q21 Dumps
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Question 11

An administrator is tasked to configure NSX Federation between separate VMware Cloud Foundation (VCF) Fleets. Which requirement must all sites meet before being added to a Global Manager (GM) for NSX Federation?

Correct Answer: C
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Question 12

How should the Global Managers (GMs) and Local Managers (LMs) be distributed to ensure high availability and optimal performance in a multi-site NSX Federation deployment comprised of three sites? (Choose two.)

Correct Answer: A,D
Comprehensive and Detailed 250 to 350 words of Explanation From VMware Cloud Foundation (VCF) documents:
In aVMware Cloud Foundation (VCF)Federation deployment across multiple sites, the management architecture is designed to provide "Global Visibility" while maintaining "Local Autonomy." This is achieved through the coordinated distribution ofGlobal Managers (GMs)andLocal Managers (LMs).
For a three-site deployment,NSX Federationbest practices mandate that each site maintains its ownLocal Manager (LM) Cluster(Option A). The LM is responsible for the site-specific control plane, communicating with local Transport Nodes (ESXi and Edges) to program the data plane. If the connection to the GM is lost, the LM ensures the local site continues to function normally. For production environments, these must be clusters (typically 3 nodes) rather than single nodes to ensure local management remains available.
To protect theGlobal Manageritself-which is the source of truth for all global networking and security policies-the GM cluster should bestretched across the three sites(Option D). In a standard 3-node GM cluster, placing one node at each site ensures that the Federation management plane can survive the complete failure of an entire site. This "stretched" cluster configuration provides a high level of resilience and ensures that an administrator can still manage global policies from any surviving location.
Option B is incorrect because the GM does not communicate directly with the data plane of a site; it must go through an LM. Option C is a risk to availability. Option E is incorrect because vSphere HA cannot protect against a site-wide disaster, and a single appliance represents a significant single point of failure for the entire global network configuration.
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Question 13

An administrator is upgrading an existing VMware Cloud Foundation (VCF) environment. An NSX Edge Cluster is required to support north-south traffic for a workload domain. How would the administrator initiate the edge cluster deployment?

Correct Answer: B
Comprehensive and Detailed 250 to 350 words of Explanation From VMware Cloud Foundation (VCF) documents:
In the architectural framework ofVMware Cloud Foundation (VCF) 9.0, the deployment and lifecycle management of infrastructure components have transitioned into a unified "Fleet Management" model. While previous versions of VCF (like 4.x or 5.x) relied exclusively on the SDDC Manager UI for the deployment of NSX Edge Clusters, VCF 9.0 centralizes these operations withinVCF Operations(integrated with the functionality formerly known as Aria Operations).
To initiate the deployment of an NSX Edge Cluster for a workload domain, the administrator uses theVCF Operations Fleet Manager. This interface provides a centralized orchestration point for the entire VCF
"fleet." When the deployment is triggered here, the system automates the selection of the underlying ESXi hosts, the configuration of the Virtual Distributed Switch (VDS) trunks, and the instantiation of the Edge VM appliances. This ensures that the deployment adheres strictly to theVMware Validated Solutions (VVS) guidelines and is consistent across all domains.
Option A is incorrect because theVCF Installer(Cloud Builder) is used for the initial "Day 0" bring-up of the Management Domain, not for post-deployment additions to workload domains. Option C and D are incorrect asvCenterand theVAMIdo not possess the multi-component awareness or the SDDC-level automation required to configure NSX Edge Clusters in a VCF context. By usingFleet Manager, VCF ensures that the new Edge cluster is automatically integrated into the SDDC Manager's inventory and lifecycle management workflows, maintaining a "single source of truth" for the entire private cloud environment.
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Question 14

An administrator changed the SFTP server used for scheduled NSX Manager backups. The backup jobs now fail with the error "Host KEY Verification Failed." The connectivity and credentials are correct. How would an administrator resolve the error?

Correct Answer: B
Comprehensive and Detailed 250 to 350 words of Explanation From VMware Cloud Foundation (VCF) documents:
InVMware Cloud Foundation (VCF), theNSX Manageruses the SFTP protocol to securely transfer configuration backups to an external repository. SFTP is built on top of the SSH protocol, which relies on a
"Trust on First Use" (TOFU) model for verifying the identity of the remote host.
When an NSX Manager first connects to an SFTP server, it retrieves the server'sSSH Public Key Fingerprint and stores it in its local known_hosts equivalent database. This fingerprint ensures that future connections are made to the same, verified server, preventing man-in-the-middle attacks.
The error"Host KEY Verification Failed"occurs when the administrator changes the SFTP server (or if the SFTP server's OS was reinstalled/keys regenerated). Even if the IP address remains the same, the new server presents a different SSH fingerprint than the one currently cached in the NSX Manager configuration.
Because the signatures do not match, the NSX Manager aborts the connection for security reasons.
To resolve this issue, the administrator mustUpdate the SSH fingerprint(Option B) within the NSX Manager backup settings. This involves:
* Retrieving the new fingerprint from the SFTP server (e.g., via ssh-keyscan).
* Navigating to System > Lifecycle > Backup & Restore in the NSX Manager.
* Editing the File Server configuration and pasting the new fingerprint into the appropriate field.
Option A is incorrect as it does not address the SSH protocol handshake failure. Option C is incorrect because SFTP/SSH uses fingerprints, not SSL/TLS certificates. Option D is irrelevant as it changes the source
/destination of the connection but does not fix the underlying trust mismatch. Therefore, updating the fingerprint is the verified operational step to restore the automated backup workflow in VCF.
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Question 15

An administrator is configuring an NSX segment used by a nested hypervisor deployment where an ESXi VM runs on an ESXi host and multiple VMs run inside the ESXi VM. Which segment profile must be created to satisfy the request?

Correct Answer: C
Comprehensive and Detailed 250 to 350 words of Explanation From VMware Cloud Foundation (VCF) documents:
Nested virtualization-where a hypervisor like ESXi is run as a virtual machine-imposes unique challenges on the virtual networking layer. In a standard VCF environment, an NSX segment port expects to see exactly one MAC address: the MAC address assigned to the VM's vNIC.
When you run anested hypervisor, that single vNIC now acts as an "uplink" for multiple "inner" virtual machines. Consequently, traffic originating from that single nested ESXi VM will contain many different source MAC addresses (one for each nested VM). By default, the NSX/VDS security and switching logic will drop this traffic because it appears asMAC Spoofing-packets are arriving from a port with source MACs that do not match the port's registered ID.
To support this, aMAC Discovery Segment Profilemust be configured and applied to the segment. Within this profile, the administrator must enableMAC Learning. MAC Learning allows the NSX virtual switch to
"learn" and permit multiple MAC addresses on a single logical port. Without this, only the primary MAC of the nested ESXi host would be allowed, and all nested VMs would lose connectivity to the rest of the network.
In VCF 5.x and 9.0 documentation, this is a standard requirement for "Lab-on-a-Lab" designs or development environments. WhileIP Discovery(Option A) andSpoof Guard(Option D) are important for maintaining the IP-to-MAC binding and preventing IP theft, they do not address the fundamental Layer 2 requirement of allowing multiple MAC identities on a single port. Therefore,MAC Discoverywith MAC learning enabled is the verified profile choice for nested hypervisor support.
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