VCP-DCV Practice Test 26 — 15 Questions

Question 1

Refer to the exhibit. Based on the esxtop output, what is the likely cause of performance degradation for VM 'AppSrv'?

Accepted Answer

Memory contention. High %MLMTD (memory load management) indicates memory contention. The VM is waiting for memory resources to be reclaimed, which degrades performance. Option B is correct. CPU metrics are low, so not A. No storage or network metrics shown, so C and D are not indicated.

Answer

CPU contention

Answer

Network congestion

Answer

Storage I/O latency

Question 2

A vSphere cluster has 10 ESXi hosts configured with vSphere DRS. The administrator wants to ensure that a group of VMs running a latency-sensitive application are always placed on the same host. Which DRS rule should be created?

Accepted Answer

VM-VM affinity rule with a 'must run on the same host' constraint.. Option B is correct because a VM-VM affinity rule (Must run on the same host) ensures that VMs in a group are kept together. Option A is incorrect because host affinity rules affect VM-host relationships, not VM-VM. Option C is incorrect because should run on hosts is a preference, not mandatory. Option D is incorrect because Separate VMs rule does the opposite.

Answer

VM-to-Host affinity rule with a 'should run on hosts in group' constraint.

Answer

VM-VM affinity rule with a 'should run on the same host' constraint.

Answer

VM-VM anti-affinity rule with a 'separate VMs' constraint.

Question 3

An administrator is troubleshooting a VM that is running slowly. Esxtop shows the VM has high %SWPWV (swap wait). Which three conditions could cause this? (Choose three.)

Accepted Answer

The host is overcommitted on memory. The correct options are A, C, and E. Swap wait occurs when the VM is waiting for swapped memory. A limit lower than active forces swapping. Host memory overcommitment causes swapping. Slow vswap storage increases latency. CPU overcommitment does not cause swap wait. Reservation equal to configured size would prevent swapping.

Answer

The VM has a memory reservation equal to its configured size

Answer

The host is overcommitted on CPU

Question 4

An administrator is monitoring a vSphere cluster with 10 hosts. They notice that vCenter Server is responding slowly when performing operations such as creating VMs or applying host profiles. CPU and memory on the vCenter Server are within normal limits. What is the most likely cause?

Accepted Answer

The vCenter Server database is too large and needs to be trimmed.. A large vCenter Server database can cause slow response times for management operations. Option A is correct. Option B is unlikely since network bandwidth is not indicated as an issue. Option C is not a typical cause of slow operations. Option D would cause more severe issues.

Answer

The vCenter Server is experiencing time synchronization issues.

Answer

The vCenter Server is running on a VM with insufficient network bandwidth.

Answer

The ESXi hosts are all in maintenance mode.

Question 5

Refer to the exhibit. What is the most likely cause of the vSAN cluster health degradation?

Accepted Answer

Disk capacity on a host is nearly full. The output shows a capacity health warning because a host crossed the disk utilization threshold (80%). Option B is correct. Other health checks are healthy, so A, C, and D are incorrect.

Answer

vSAN performance service is not running

Answer

Network misconfiguration

Answer

Object health is failing

Question 6

An administrator wants to limit the amount of CPU resources a single VM can consume in a vSphere cluster. Which feature should be used?

Accepted Answer

CPU limit. A CPU limit sets an upper bound on CPU usage. Option C is correct. Option A (resource pools) can limit at a group level but not per VM easily. Option B (affinity) binds vCPUs to cores. Option D (reservation) guarantees minimum resources.

Answer

CPU affinity

Answer

CPU reservation

Answer

Resource pools

Question 7

A vSphere administrator notices that one ESXi host in a DRS-enabled cluster is consistently running at 95% CPU utilization while other hosts average 40%. Which action should the administrator take to determine the cause?

Accepted Answer

Review the host's performance charts in vCenter for CPU contention metrics.. Option B is correct because examining the vCenter performance charts for the host can show historical data and identify resource contention patterns. Option A is incorrect because increasing migration threshold might cause unnecessary vMotions. Option C is incorrect because DRS automation level does not provide diagnostic data. Option D is incorrect because the host is not in maintenance mode.

Answer

Increase the DRS migration threshold from 3 to 5.

Answer

Place the host into maintenance mode to isolate the problem.

Answer

Set the DRS automation level to Fully Automated.

Question 8

A VM with a large memory footprint is experiencing high swap rates. The host has free memory but the swap rate is still high. What is the most likely cause?

Accepted Answer

The VM's memory limit is set too low.. If the VM's memory limit is set lower than its active memory, the guest OS may be forced to swap even if host memory is available. Option B is correct. Option A (high reservation) would not cause swapping. Option C is unrelated to memory swapping. Option D involves the swap file location but the host has free memory, so swapping should not occur.

Answer

The VM's virtual machine swap file is on a slow datastore.

Answer

The host is using software iSCSI causing high latency.

Answer

The VM's memory reservation is set too high.

Question 9

Which setting must be consistent across all hosts in a vMotion migration to ensure that virtual machines maintain optimal performance after migration?

Accepted Answer

Enhanced vMotion Compatibility (EVC) mode.. Option A is correct because Enhanced vMotion Compatibility (EVC) ensures that the CPU features exposed to VMs are consistent across hosts, preventing performance degradation due to feature masking. Option B is incorrect because while NUMA alignment is important, it is not a prerequisite for vMotion. Option C is incorrect because DPM can cause issues but is not directly related to vMotion performance. Option D is incorrect because resource pools do not affect vMotion compatibility.

Answer

Resource pool shares configuration.

Answer

Distributed Power Management (DPM) threshold.

Answer

NUMA node alignment for each VM.

Question 10

A vSphere administrator is troubleshooting a VM that hosts a critical database. The VM is configured with 8 vCPUs and 64 GB memory on an ESXi host with two 10-core CPUs (hyperthreading enabled). Performance charts show CPU ready time averaging 12% during peak hours, and the database application is experiencing high transaction latency. The administrator has verified that no other VMs are contending for CPU. Which action will most likely reduce CPU ready time without negatively impacting database performance?

Accepted Answer

Reduce the number of vCPUs assigned to the VM to 4.. Option C is correct because reducing the number of vCPUs to match the actual workload reduces scheduler overhead and improves cache locality. A VM with 8 vCPUs on a host with 40 logical CPUs should not normally have high ready time unless the vCPU count is excessive relative to the workload. Reducing to 4 vCPUs often resolves contention without degrading throughput because many database workloads do not scale linearly beyond 4 vCPUs. Option A is wrong because disabling hyperthreading reduces logical CPUs, potentially increasing contention. Option B is wrong because increasing memory does not affect CPU ready time. Option D is wrong because CPU affinity can lead to unbalanced load and is not a best practice for DRS clusters.

Answer

Disable hyperthreading on the host.

Answer

Assign a CPU affinity mask to pin the VM to specific physical cores.

Answer

Increase the VM's memory reservation.

Question 11

Refer to the exhibit. Based on the performance chart, which component is likely causing the VM to experience a bottleneck?

Accepted Answer

Disk. Disk read latency is very high (average 60ms, max 120ms), indicating a storage bottleneck. CPU and memory usage are moderate, and network throughput is average. Option C is correct.

Answer

CPU

Answer

Memory

Answer

Network

Question 12

What is the maximum number of virtual CPUs (vCPUs) that can be allocated to a virtual machine on vSphere 8 Enterprise Plus?

Accepted Answer

256. Option A is correct because vSphere 8 supports up to 256 vCPUs per VM (with appropriate licensing). Option B is incorrect because 128 was the limit in vSphere 6.5. Option C is incorrect because 512 is not supported. Option D is incorrect because 64 is lower than current maximum.

Answer

128

Answer

512

Answer

64

Question 13

An administrator is troubleshooting a virtual machine that experiences intermittent performance issues. The VM is configured with 8 vCPUs and 32 GB memory. The administrator runs esxtop and sees that the %RDY for the VM is consistently above 20%. What does this indicate?

Accepted Answer

The VM is contending for CPU resources due to overallocation of vCPUs.. Option D is correct because high %RDY means the VM is ready to run but is waiting for CPU resources from the hypervisor; this indicates CPU overcommitment. Option A is incorrect because high %RDY does not directly correlate with memory. Option C is incorrect because storage latency is not shown in CPU %RDY. Option B is incorrect because high %RDY is a sign of CPU contention, not just normal utilization.

Answer

The VM's virtual disks are experiencing high latency.

Answer

The VM is experiencing memory ballooning.

Answer

The VM is using its CPU resources efficiently.

Question 14

Which TWO conditions must be met for a successful Storage vMotion of a virtual machine with a raw device mapping (RDM) in physical compatibility mode?

Accepted Answer

The source and target datastores support SCSI-3 persistent reservations.. Option A is correct because the source and target datastores must support SCSI-3 persistent reservations. Option D is correct because the destination datastore must be compatible with physical RDMs. Option B is incorrect because RDM vMotion does not require shared storage. Option C is incorrect because the VM can be powered on. Option E is incorrect because RDM vMotion does not require the same storage array.

Answer

The source and target are on the same storage array.

Answer

The virtual machine is using a shared virtual SCSI controller.

Answer

The virtual machine must be powered off.

Question 15

Which THREE factors should be considered when designing a vSphere environment to minimize vCPU overcommitment and improve performance for CPU-intensive workloads?

Accepted Answer

Align VM memory with NUMA nodes to reduce remote memory access.. Option B is correct because more physical cores reduce contention. Option C is correct because vSphere can use core-level scheduling to improve performance. Option D is correct because NUMA awareness ensures VMs are scheduled on local memory. Option A is incorrect because large vCPUs can increase overhead. Option E is incorrect because simultaneous multithreading (hyperthreading) increases logical CPUs but may not reduce overcommitment for heavily CPU-bound workloads.

Answer

Use VMs with a high number of vCPUs (e.g., 2:1 ratio to pCPUs).

Answer

Enable Hyper-Threading on all hosts.

VCP-DCV Practice Test 26 — 15 Questions

Exhibit

VCP-DCV Practice Test 26 — 15 Questions

Exhibit