VCP-DCV Practice Test 25 — 15 Questions

Question 1

An administrator is analyzing performance data for a vSphere cluster and wants to identify VMs that are experiencing memory pressure. Which two metrics from esxtop or vCenter performance charts reliably indicate that a VM is actively reclaiming memory due to contention? (Choose two.)

Accepted Answer

Ballooned memory. Memory ballooning and swapping are clear indicators of memory pressure. Ballooning occurs when the VMkernel reclaims memory from a VM via the balloon driver, and swapping occurs when the hypervisor is forced to swap pages to disk. Active memory is the currently used memory, not a sign of pressure. Consumed memory includes overhead and target memory. Overhead memory is the hypervisor overhead, not a pressure metric.

Answer

Consumed memory

Answer

Active memory

Answer

Overhead memory

Question 2

Refer to the exhibit. An administrator sees two DRS recommendations. Which action should the administrator take first to reduce cluster imbalance?

Accepted Answer

Migrate DB01 to host04 first. The DB01 migration provides a higher benefit (15%) compared to Web01 (10%). Starting with the higher impact migration reduces imbalance more effectively.

Answer

Migrate Web01 to host04 first

Answer

Migrate both VMs simultaneously

Answer

Ignore the recommendations; the cluster is balanced

Question 3

A vSphere cluster with DRS enabled is experiencing an imbalance in resource utilization across hosts. DRS is set to 'Manual' mode. What action should the administrator take to resolve the imbalance?

Accepted Answer

Manually migrate VMs using vMotion.. In Manual mode, DRS only provides recommendations; the administrator must manually migrate VMs using vMotion. Option B is correct. Option A would automate future migrations but does not resolve current imbalance. Option C changes threshold but won't act immediately. Option D is unrelated.

Answer

Change DRS to 'Fully Automated' mode.

Answer

Enable HA admission control.

Answer

Increase the DRS migration threshold.

Question 4

An administrator configures a resource pool with a CPU reservation and expandable reservation enabled. The root resource pool has 100% of cluster CPU resources. A VM inside the resource pool with no reservation requests CPU resources. What will happen when the VM tries to power on?

Accepted Answer

The VM can power on using resources from the resource pool or its parent due to expandable reservation.. Option D is correct because expandable reservation allows the resource pool to borrow CPU resources from the parent pool if needed. Since the VM has no reservation, it can power on as long as there are any unreserved resources in the resource pool or parent. Option A is incorrect because the VM can power on without a reservation. Option B is incorrect because reservation is not mandatory to power on. Option C is incorrect because expandable reservation allows borrowing from parent.

Answer

The VM can power on but will be limited to the resource pool's shares.

Answer

The VM cannot power on because the resource pool has a reservation set.

Answer

The VM can power on using resources from the resource pool only if it has a reservation.

Question 5

A vSphere cluster is experiencing high CPU ready time across multiple hosts during peak hours. The cluster consists of 8 hosts, each with 2 sockets and 8 cores per socket (hyperthreading enabled). DRS is set to a moderately aggressive migration threshold. The administrator needs to reduce CPU contention without disrupting workloads. Which three actions should the administrator consider? (Choose three.)

Accepted Answer

Upgrade the ESXi hosts to models with higher CPU clock speeds.. Enabling hyperthreading increases logical CPUs and can reduce ready time. Reducing the number of VMs per host decreases overall demand. Upgrading to faster CPUs increases per-core capacity. Setting CPU affinity on VMs is not recommended as it limits DRS balancing. Increasing the DRS migration threshold to the most aggressive may cause excessive migrations and does not address the root cause. Adding vCPUs to VMs would worsen contention.

Answer

Configure CPU affinity for VMs with high vCPU counts.

Answer

Increase the DRS migration threshold to the most aggressive setting.

Question 6

Refer to the exhibit. The administrator is troubleshooting performance for VM 'vm2'. Based on the log, what is the performance issue?

Accepted Answer

The VM is not experiencing significant CPU performance issues. The CPU ready time values (around 3%) are within acceptable thresholds (typically under 5%). There is no indication of contention or overcommitment.

Answer

The host is overloaded with too many VMs

Answer

The VM is experiencing high CPU ready time indicating starvation

Answer

The VM has a memory balloon driver issue

Question 7

Which TWO options are valid methods to reduce vSphere storage latency? (Select two.)

Accepted Answer

Enable Storage I/O Control (SIOC).. Correct: B (SIOC) and D (more storage adapters). SIOC prioritizes I/O to reduce latency for critical VMs. More storage adapters increase parallelism. Option A (space reclamation) helps efficiency but not latency. Option C (dedup/compression) may increase latency due to CPU overhead. Option E (larger block size) may help sequential but not reduce overall latency.

Answer

Use VMFS-6 with automatic space reclamation.

Answer

Use larger block sizes in VMFS.

Answer

Use vSAN with deduplication and compression.

Question 8

An administrator is planning a vMotion migration and wants to minimize the performance impact on the virtual machines during the migration. Which network configuration is recommended?

Accepted Answer

Create a dedicated VMkernel interface with at least 10 GbE throughput for vMotion.. Option D is correct because a dedicated VMkernel interface for vMotion ensures that migration traffic does not compete with other types of traffic, reducing latency and improving throughput. Option A is incorrect because using the management network can cause contention. Option B is incorrect because large send offload is not a substitute for dedicated interface. Option C is incorrect because 1 GbE may be insufficient for large VMs.

Answer

Use the default management VMkernel interface for vMotion traffic.

Answer

Configure a single 1 GbE interface for both vMotion and management traffic.

Answer

Enable jumbo frames on all interfaces, but keep vMotion on the management network.

Question 9

An administrator notices that a critical virtual machine is running slowly. The VM has 8 vCPUs and 32GB memory. The host is an ESXi 7.0 server with two Intel Xeon Gold 6248 sockets (20 cores each, hyperthreading enabled). The VM's CPU ready time is consistently above 10%. What is the most likely cause?

Accepted Answer

The host has too many VMs running and CPU oversubscription is too high.. High CPU ready time indicates the VM is ready to run but the hypervisor cannot schedule it. This is typically due to excessive CPU oversubscription. Option A is incorrect because 8 vCPUs is not over-provisioned relative to 80 logical CPUs. Option B is incorrect as NUMA pinning generally affects memory locality, not ready time. Option D is incorrect because disk I/O does not cause CPU ready time.

Answer

The VM's vCPUs are pinned to a single NUMA node causing contention.

Answer

The VM is over-provisioned on vCPUs relative to the host's physical cores.

Answer

The VM is using Eager Zero Thick disks causing high I/O latency.

Question 10

Which THREE techniques are recommended to improve virtual machine network performance in a vSphere environment? (Select three.)

Accepted Answer

Enable Jumbo Frames on the virtual switch.. Correct: B (SR-IOV), D (Jumbo Frames), E (VMXNET3). SR-IOV reduces virtualization overhead. Jumbo Frames reduce CPU overhead for large packets. VMXNET3 is a paravirtualized adapter with excellent performance. Option A (e1000e) is emulated and slower. Option C (dedicated vSwitch per VM) adds complexity without benefit.

Answer

Use a dedicated virtual switch for each VM.

Answer

Use the e1000e network adapter type.

Question 11

An ESXi host experiences high memory ballooning in virtual machines. The administrator checks the host's memory metrics and sees a high swap rate. The host has 512 GB of memory, and the VMs are configured with memory reservations. Which configuration is most likely contributing to the excessive swapping?

Accepted Answer

Memory overcommitment is high, and some VMs have large memory reservations.. Option C is correct because when memory is overcommitted and VMs have reservations but the host is under memory pressure, the hypervisor may still swap to free up memory for reservations. Option A is incorrect because TPS is typically beneficial and does not cause swapping. Option B is incorrect because NUMA interleaving does not cause memory pressure. Option D is incorrect because memory shares do not affect ballooning; they affect proportional distribution.

Answer

Memory shares are set too low for the VMs experiencing ballooning.

Answer

The host is configured for NUMA interleaving, causing memory access delays.

Answer

Transparent Page Sharing (TPS) is enabled and is aggressively sharing memory pages.

Question 12

A vSphere administrator is troubleshooting a VM that shows high 'CPU ready' time in vCenter performance charts. The host has 32 logical CPUs (16 cores with HT). Which tool should be used to identify which other VMs are contending for CPU resources?

Accepted Answer

Esxtop with CPU world view. Option D is correct because esxtop with the CPU world view shows per-vCPU ready time and which worlds are consuming CPU. Option A is wrong; vCenter charts show aggregate VM ready time but not per-world contention. Option B is wrong; resxtop is remote esxtop, but 'CPU view' refers to the summary view; the CPU world view is more detailed. Option C is wrong; vROps can show trends but not real-time per-world details.

Answer

vRealize Operations Manager

Answer

Resxtop with CPU view

Answer

vCenter Resource Allocation chart

Question 13

A company uses vSphere 7 with Distributed Resource Scheduler (DRS). They want to ensure that VMs are migrated to hosts with more available resources during peak load. Which default DRS setting controls the aggressiveness of initial placement and migration?

Accepted Answer

Migration threshold. The DRS migration threshold (1-5) determines how aggressively DRS will recommend and apply migrations. Option A is correct. Options B, C, D are unrelated to DRS migration aggressiveness.

Answer

VM monitoring sensitivity

Answer

EVC mode

Answer

HA admission control

Question 14

Which TWO are correct statements about vSphere resource pools? (Select two.)

Accepted Answer

Resource pools can be nested.. Correct: A (resource pools can be nested) and B (they have shares, limits, reservations). Option C is false because resource pools can exist on standalone hosts as well. Option D is false because resource pools aggregate resources for multiple VMs, not isolate individual VMs. Option E is false because child pools do not inherit settings by default; they can be configured independently.

Answer

Resource pools can be used to isolate performance for individual VMs.

Answer

Resource pools inherit settings from parent pools by default.

Answer

Resource pools are only available in clusters.

Question 15

A vSphere administrator is troubleshooting a performance issue on a VM that has high average latency on its virtual disks. The VM is stored on a VMFS datastore backed by an all-flash array. The VM has 4 vCPUs and 16GB memory. The administrator runs esxtop and sees %USEDRDY: 0.5, %MLMTD: 10, %SWPWT: 0. What is the most likely cause of the high disk latency?

Accepted Answer

The VM is experiencing memory contention that is manifesting as disk latency. %MLMTD indicates memory contention. When memory resources are constrained, the hypervisor may throttle the VM, affecting all operations including disk I/O. Option D is correct. Options A and C are not supported by the esxtop metrics. Option B is incorrect because %SWPWT is 0, indicating no swapping.

Answer

Memory ballooning is causing excessive swapping

Answer

CPU ready time is high

Answer

Storage controller queue depth is full