VCP-DCV Practice Test 2 — 10 Questions

Question 1

A company runs a critical e-commerce platform on a vSphere 7 cluster with ESXi hosts connected to a vSAN datastore. The environment uses vSphere Trust Authority (vTA) and VM encryption with an external KMS. Recently, after a successful vTA attestation, one of the VMs (WebServer-01) failed to power on with the error: 'Unable to decrypt the encrypted virtual machine upon re-registration. Reason: The KMS server is unreachable.' The administrator verifies that other encrypted VMs on the same host power on successfully. The KMS cluster consists of two servers: KMS-01 and KMS-02, both accessible from the management network. The administrator checks the VM's configuration and finds that it uses a custom storage policy with encryption. What is the most likely cause of this specific VM's failure?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

The VM's encryption key was retrieved from a different KMS server that is now unavailable, and the key ID in the VM's metadata points to that KMS server.. The error 'Unable to decrypt the encrypted virtual machine upon re-registration. Reason: The KMS server is unreachable' indicates that the ESXi host cannot contact the KMS server to retrieve the VM's encryption key. Since other encrypted VMs on the same host power on successfully, the host can reach the KMS cluster, but this specific VM's encryption key may have been issued by a different KMS server (e.g., an older or alternative KMS) that is now unavailable. The key ID stored in the VM's metadata points to that unreachable server, causing the failure. Option A is incorrect because if the vCenter KMS cluster configuration were deleted, all VMs would be affected. Option B is incorrect because modifying the storage policy does not change the existing encryption key; the VM remains encrypted with its original key. Option C is incorrect because vTA attestation is separate from KMS key retrieval; the error message is specific to KMS unavailability.

Answer

The vCenter Server's KMS cluster configuration has been deleted, affecting all VMs but not this one.

Answer

The storage policy used by the VM has been modified and no longer includes encryption.

Answer

The vTA attestation process failed for the VM's host, but the error message is misleading.

Question 2

A VM configured with 4 vCPUs shows high co-stop time in performance metrics. What does co-stop time indicate and which action should be taken to improve performance?

Accepted Answer

Reduce the number of vCPUs to match workload requirements. Co-stop time is time when the VM is ready to run but waiting for all vCPUs to be scheduled simultaneously. Reducing the number of vCPUs can alleviate this.

Answer

Add more vCPUs to the VM

Answer

Enable hyperthreading on the host

Answer

Increase the VM's memory reservation

Question 3

Refer to the exhibit. A distributed virtual switch port shows dropped Rx packets and CRC errors. What is the most likely cause?

Accepted Answer

Faulty physical network cable or NIC.. CRC errors and dropped Rx packets on a distributed virtual switch port indicate physical-layer corruption of frames, typically caused by a faulty cable, damaged NIC, or bad transceiver. These errors occur when the cyclic redundancy check (CRC) computed by the receiver does not match the frame's CRC field, which is a direct symptom of signal integrity issues at Layer 1.

Answer

Outdated NIC driver on the ESXi host.

Answer

MTU mismatch between the switch and the VM.

Answer

Incorrect VLAN configuration on the port group.

Question 4

Which TWO actions are effective in reducing CPU ready time on a vSphere host that is heavily overcommitted on CPU? (Choose two.)

Accepted Answer

Add more hosts to the cluster.. Option A is correct because CPU ready time reflects the percentage of time a vCPU is ready to run but is waiting for a physical CPU (pCPU) to become available; adding more hosts to the cluster increases the total pCPU capacity and reduces the vCPU-to-pCPU overcommitment ratio, directly lowering ready time. Option D is correct because reducing the number of vCPUs on over-provisioned VMs lowers the total number of vCPUs contending for the same pCPUs, which decreases scheduling contention and thus ready time. Option B is not correct because enabling hyperthreading exposes logical processors but does not add real execution resources, and it can even increase contention for physical cores. Option C is not correct because adding vCPUs to VMs already experiencing high ready time increases the overcommitment and typically worsens ready time. Option E is not correct because CPU affinity pins vCPUs to specific pCPUs, which restricts the scheduler's flexibility and can increase ready time rather than reduce it.

Answer

Enable hyperthreading on the host CPUs.

Answer

Increase the number of vCPUs on VMs with high ready times.

Answer

Configure CPU affinity to pin vCPUs to specific pCPUs.

Question 5

An administrator is configuring multipathing for a Fibre Channel storage array. The administrator wants to maximize throughput by using all available paths. Which path selection policy should be chosen?

Accepted Answer

Round Robin (VMW_PSP_RR). Round Robin (VMW_PSP_RR) is the only path selection policy that actively distributes I/O across all available paths to a given device in a round-robin fashion, thereby maximizing throughput by utilizing all paths simultaneously. It is the default PSP for most block storage arrays in ESXi and is recommended for active-active arrays. By cycling through each path, it avoids saturating a single path and can significantly improve performance. This aligns with the administrator's goal of using all available paths to maximize throughput.

Answer

Fixed (VMW_PSP_FIXED)

Answer

Most Recently Used (VMW_PSP_MRU)

Answer

Vendor-specific (VMW_PSP_FIXED_AP)

Question 6

An administrator is troubleshooting a performance issue where a VM is not receiving the expected CPU resources. The VM is a member of a resource pool with a CPU Shares value of 2000. The host has two other resource pools: one with 1000 shares and another with 500 shares. All resource pools are competing for CPU. The VM's reservation is set to 2 GHz, and the host has 8 GHz available. What is the minimum CPU allocation the VM is guaranteed?

Accepted Answer

2 GHz. The VM's reservation of 2 GHz guarantees that the host will reserve at least that amount of CPU capacity for the VM, regardless of contention or share values. Shares only affect the distribution of excess resources beyond reservations, not the guaranteed minimum. Since the host has 8 GHz available, the reservation is fully satisfiable, so the VM is guaranteed 2 GHz.

Answer

4 GHz (based on share ratio)

Answer

8 GHz (all host CPU)

Answer

0 GHz (no guarantee without reservation)

Question 7

A company runs a critical SQL Server VM on vSphere 7.0. The VM has a single 300 GB virtual disk on a VMFS6 datastore backed by a SAN with 8 Gbps Fibre Channel. The VM is configured with 16 vCPUs and 64 GB RAM. Recently, users have reported slow query performance. The administrator checks the datastore performance and sees average latency of 15 ms with peaks of 50 ms during business hours. The storage array has multiple paths to the ESXi host, and the current path policy is Fixed with a single active path. The administrator wants to improve storage performance with minimal cost. Which action should the administrator take first?

Accepted Answer

Change the path selection policy to Round Robin on the ESXi host.. The current Fixed path policy with a single active path underutilizes the available storage bandwidth, causing high latency during peak I/O. Changing to Round Robin (RR) distributes I/O across all available paths, reducing queue depth on any single path and lowering latency without any hardware cost. This is the most immediate and cost-effective fix for the observed performance issue.

Answer

Add a vSphere Flash Read Cache to the VM.

Answer

Upgrade the Fibre Channel infrastructure to 16 Gbps.

Answer

Convert the virtual disk to thin provisioning to reduce I/O.

Question 8

An administrator is troubleshooting a VM that is running slowly. The VM has 4 vCPUs and 16 GB of memory. The host has 2 physical CPUs with 10 cores each, hyper-threading enabled. The administrator runs esxtop and sees that %RDY for the VM is consistently above 15%. Which action would most likely reduce the ready time?

Accepted Answer

Reduce the number of vCPUs to 2 if the workload does not require 4.. A %RDY value consistently above 15% indicates the VM is ready to run but is waiting for CPU scheduling time on the host. With 4 vCPUs on a host that has 20 logical CPUs (2 sockets × 10 cores × 2 threads), the VM is likely over-provisioned relative to its workload needs, causing co-scheduling contention. Reducing the number of vCPUs to 2 decreases the co-scheduling demands and reduces ready time, as the VM will require fewer physical CPUs to be available simultaneously. Therefore, option D is correct. Increasing CPU shares (option A) would not help if the host is saturated, adding more vCPUs (option B) would worsen contention, and increasing memory (option C) does not address CPU ready time.

Answer

Increase the CPU shares for the VM.

Answer

Increase the number of vCPUs to 8 to improve parallelism.

Answer

Increase the memory allocation to 32 GB.

Question 9

Match each vSphere security feature to its description.

Accepted Answer

ESXi Firewall: Controls network traffic to and from ESXi hosts based on rules.. The correct matches are: ESXi Firewall controls network traffic, VM Encryption encrypts VM files, and vTPM provides virtual TPM. Common confusions involve swapping these definitions.

Answer

ESXi Firewall: Encrypts virtual machine files and disks to protect data at rest.

Answer

VM Encryption: Controls network traffic to and from ESXi hosts based on rules.

Answer

vTPM: Controls network traffic to and from ESXi hosts based on rules.

Question 10

Which TWO storage performance best practices should be followed when scaling a vSphere environment using shared storage? (Choose two.)

Accepted Answer

Enable Storage I/O Control (SIOC) on datastores to manage I/O latency.. Option B is correct because Storage I/O Control (SIOC) lets vSphere enforce per-datastore I/O latency thresholds and fairly share I/O among virtual machines when a shared datastore becomes congested, which is a recommended best practice for scaling shared storage. Option C is correct because configuring multiple paths to the shared LUN and using the round-robin path selection policy (PSP) enables multipathing, increases aggregate bandwidth, and provides path failover for better performance and availability at scale. Option A is not a general performance best practice; Raw Device Mapping in physical compatibility mode is used mainly for clustering or SAN-specific requirements and can limit vSphere features. Option D is not a scaling best practice for shared storage because vSphere Flash Read Cache is a host-local read cache and does not address shared-storage scalability. Option E is incorrect because VMFS-3 is an obsolete version with datastore size and scalability limits compared with VMFS-5/VMFS-6, and it does not reduce seek time.

Answer

Use Raw Device Mapping in physical compatibility mode for virtual machines.

Answer

Deploy vSphere Flash Read Cache to reduce read latency.

Answer

Use VMFS-3 for large datastores to reduce seek time.