3V0-13.26 Exam Preparation Material | Advanced VMware Cloud Foundation 9.0 Support

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Prepare for the 3V0-13.26 Advanced VMware Cloud Foundation 9.0 Support exam with CertQueen's independently developed study resources. Review important concepts, practice scenario-based questions, and use clear explanations to identify areas that require further study.

Question#1

An ESXi host in a VCF Workload Domain loses connectivity to a Fibre Channel LUN. You are reviewing the /var/log/vmkernel.log and trying to determine if this is an APD (All Paths Down) event or a PDL (Permanent Device Loss) event.
Which characteristic exclusively identifies a PDL state rather than an APD state?

A. The host's hostd service becomes immediately unresponsive due to I/O retries.
B. The storage array returns a specific SCSI sense code to the ESXi host indicating the device is no longer available (e.g., LUN unmapped).
C. The ESXi host automatically starts a 140-second timeout timer before terminating I/O operations.
D. The ESXi host initiates a vSphere HA failover immediately without checking the storage array's heartbeat.

Explanation:
A PDL (Permanent Device Loss) occurs when the storage array actively communicates to the ESXi host (via a SCSI sense code) that the device is permanently gone (e.g., the LUN was deleted or unmapped). Because the host knows the device is gone, it stops sending I/O, preventing hostd from hanging. An APD (All Paths Down) is a transient state where the host receives no response at all (e.g., a failed switch), prompting the host to endlessly retry I/O until the 140-second APD timeout expires.

Question#2

A developer complains that their multi-tier application is randomly dropping connections. You suspect that an NSX Distributed Firewall (DFW) rule is incorrectly configured. You want to inject a synthetic packet into the logical network directly from the NSX UI and visually trace its path through the virtual switches, distributed routers, and distributed firewalls to see exactly which rule is dropping the packet.
Which built-in NSX troubleshooting tool should you use?

A. Port Mirroring
B. Traceflow
C. Flow Insights
D. IPFIX

Explanation:
Traceflow is the primary data plane troubleshooting tool native to the NSX Manager UI. It allows administrators to construct a synthetic packet (specifying source VM, destination IP, protocol, port, etc.) and inject it into the vSwitch. NSX then observes the packet as it traverses the logical infrastructure. Traceflow will explicitly highlight the exact Distributed Firewall (DFW) Rule ID or Gateway Firewall rule that permitted or dropped the packet, making it the fastest way to identify policy configuration errors.
3V0-13.26 VCF Support - Mock Exam Practice Set 19
Phase 4: NSX Networking & Security
Difficulty: Level 2 (Directed Troubleshooting & Order of Operations)

Question#3

A VKS (Tanzu Kubernetes) guest cluster is experiencing high API latency. You determine that the Control Plane nodes of the guest cluster are undersized (currently using best-effort-small VM classes) and need more CPU and RAM.
How do you properly scale up the Control Plane nodes for this running VKS cluster?

A. Power off the Control Plane VMs in the vSphere Client, edit their settings to add CPU and RAM, and power them back on.
B. Modify the TanzuKubernetesCluster (TKC) YAML manifest to change the controlPlane.vmClass property to a larger class (e.g., best-effort-large ), and apply the manifest using kubectl against the Supervisor AP
C. Use VCF Operations to execute a "Right-Size VM" action on the Control Plane VMs.
D. Delete the VKS cluster and redeploy it from scratch with the new VM class.

Explanation:
VKS clusters are managed declaratively via the Cluster API on the Supervisor. You must never manually modify the guest cluster VMs directly in vCenter (Option A or C), as the Cluster API controller will detect the drift and overwrite your changes or cause split-brain issues. The correct administrative procedure is to edit the cluster's declarative YAML file (changing the vmClass ) and apply it. The Supervisor will automatically perform a rolling upgrade, deploying new, larger control plane nodes and gracefully draining/removing the old ones.

Question#4

You have configured an auto-scaling policy in VCF Automation for a critical web application deployment. The policy is designed to scale out (add another web server VM) if the CPU utilization exceeds 85% for 10 minutes. However, during a traffic spike, the CPU remains at 95% for an hour, but VCF Automation never triggers the scale-out action. You verify that the scale-out policy is correctly attached to the deployment.
What is the most likely missing integration component preventing the auto-scale trigger?

A. The VCF Operations adapter in VCF Automation requires a dedicated NSX Load Balancer.
B. VCF Operations has not been configured with an outbound Webhook notification plugin pointing to the VCF Automation API to forward the high CPU alert.
C. The guest OS VMware Tools are outdated, preventing VCF Automation from reading the CPU metrics directly.
D. The Cloud Proxy deployed in the Workload Domain is missing the VCF Automation telegraf agent.

Explanation:
VCF Automation does not natively monitor real-time performance metrics; it relies on VCF Operations for this telemetry. For auto-scaling to work, VCF Operations must detect the metric threshold breach, generate an Alert, and then push that Alert to VCF Automation via a configured Webhook notification payload. If the Webhook plugin is not configured or fails to authenticate in VCF Operations, VCF Automation will never receive the signal to execute the scale-out workflow.

Question#5

A new developer was hired this morning and added to the corporate Active Directory group "VCF-App-Developers". However, when the developer attempts to log into the VCF Automation Service Broker portal using their AD credentials, they receive an "Invalid username or password" error. Other developers in the exact same AD group who were hired last month can log in perfectly fine and access the catalog.
What is the most likely root cause of this authentication failure?

A. The developer does not have the "Service Broker User" role assigned in VCF Automation.
B. The VCF Automation appliance's internal postgres database is out of sync with vCenter.
C. The Active Directory directory synchronization schedule in VMware Workspace ONE Access (Identity Manager) has not yet run since the user was created.
D. The ESXi host running the Identity Manager appliance is out of CPU resources.

Explanation:
VCF Automation handles authentication through VMware Workspace ONE Access (formerly vIDM). Workspace ONE Access does not query Active Directory live for every single login attempt; instead, it periodically synchronizes users and groups based on a configured schedule (e.g., every 12 hours or 24 hours). If a user is created in AD after the last sync occurred, Workspace ONE Access has no record of that user, resulting in an "Invalid credentials" error. The fix is to manually force a directory sync in the Workspace ONE Access admin console. (Role assignment issues would allow login but show an empty catalog).

Exam Code: 3V0-13.26
Q & A: 115 Q&As         Updated:  Oct 15,2026

 

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Review Key Concepts

Review the technologies, products, processes, and practical skills covered by the current 3V0-13.26 exam objectives.

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Work through independently developed questions designed to strengthen your understanding of technical scenarios and decision-making.

Identify Knowledge Gaps

Use your results and the provided explanations to find weaker areas and focus your study more effectively.

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Review the Exam Scope

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Exam Code: 3V0-13.26
Q & A: 115 Q&As
Updated:  Oct 15,2026

 

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