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CCNA Virtualization Concepts Questions

30 questions · Virtualization Concepts · All types, answers revealed

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1
MCQmedium

A technician is troubleshooting a VM that fails to boot with the error 'Operating system not found.' The VM was created from a template that uses a virtual SCSI controller. The technician verifies that the ISO file is attached to the virtual DVD drive and the boot order is set to DVD first. What is the most likely cause of the error?

A.The virtual SCSI controller is not compatible with the guest OS.
B.The ISO file is corrupted or incomplete.
C.The virtual DVD drive is not connected to the VM’s IDE controller.
D.The VM’s BIOS is set to UEFI instead of legacy BIOS.
AnswerC

Many hypervisors require the virtual DVD drive to be attached to an IDE controller for booting. If it is on a SCSI controller or not attached at all, the VM cannot boot from it.

Why this answer

This error often occurs when the VM cannot find a bootable device. Even with the ISO attached, if the virtual DVD drive is not connected to the correct controller or is not enabled, the VM will not boot from it. The correct answer points to a common oversight: the virtual DVD drive may be on a different controller or not attached.

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2
MCQmedium

A technician is troubleshooting a VM that cannot connect to the internet. The host has a single NIC and uses a Type 2 hypervisor. The VM's virtual switch is set to 'NAT'. Other VMs on the same host can access the internet. What is the most likely reason for the connectivity issue?

A.The virtual switch is set to 'Internal'
B.The VM's IP address is configured as static and does not match the NAT subnet
C.The host's firewall is blocking all outbound traffic
D.The hypervisor needs to be reinstalled
AnswerB

If the VM has a static IP outside the NAT range (e.g., 192.168.137.x), it cannot reach the gateway, causing internet failure.

Why this answer

NAT mode typically works for internet access, but if other VMs are working, the problem is likely within the VM's network configuration. A misconfigured IP address or gateway can prevent connectivity even when the virtual switch is correct.

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3
MCQhard

A technician is troubleshooting a VM that frequently crashes with a 'blue screen' error. The host is a Type 1 hypervisor running on server-grade hardware with ECC RAM. The VM was created from a template and has been stable for months. Recently, the technician added a second virtual CPU to the VM. What is the most likely cause of the crashes?

A.The host's ECC RAM has detected a memory error
B.The VM's virtual disk is fragmented
C.The guest OS does not support symmetric multiprocessing (SMP) properly
D.The hypervisor's CPU scheduler is overloaded
AnswerC

If the guest OS or its drivers are not SMP-aware, adding a second vCPU can lead to kernel panics or blue screens due to race conditions.

Why this answer

Adding a second virtual CPU can expose timing and synchronization issues in the guest OS, especially if the application or OS is not optimized for multi-core. This is a known cause of instability in virtualized environments.

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4
MCQhard

A company is migrating a critical application from a physical server to a virtual machine. The application requires a static MAC address tied to its license. The technician performs a P2V migration and starts the VM, but the application fails to activate. The technician verifies that the VM has the same MAC address as the original physical server. What is the most likely cause of the activation failure?

A.The virtual switch is set to NAT, blocking the license server
B.The VM's BIOS UUID has changed from the physical server
C.The VM has insufficient RAM allocated
D.The hypervisor does not support the application's OS
AnswerB

License activation often ties to the system's unique identifiers like BIOS UUID; virtualization changes these, causing activation failure despite the same MAC.

Why this answer

Even with the same MAC address, the hypervisor presents a different hardware abstraction layer (e.g., motherboard chipset, BIOS) than the physical server. Many license activation mechanisms check multiple hardware identifiers, not just the MAC address.

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5
MCQeasy

A technician is deploying a new virtual machine on a Type 2 hypervisor (hosted) for software testing. The host machine runs Windows 10 Pro with 16 GB RAM and a quad-core CPU. The test application requires 4 GB RAM and two virtual CPUs. After creating the VM with those settings, the technician notices the host becomes extremely sluggish even when the VM is idle. What is the most likely reason for this?

A.The hypervisor does not support hardware acceleration for the guest OS.
B.The host machine’s CPU does not support Intel VT-x or AMD-V.
C.The technician allocated too much RAM to the VM, leaving insufficient memory for the host OS.
D.The virtual switch is misconfigured, causing network loops.
AnswerC

Windows 10 Pro typically requires 2-4 GB RAM to run smoothly. Allocating 4 GB to the VM leaves only 12 GB for the host, which is usually fine, but if the host has other overhead, it may still be borderline. However, the most direct cause is that the host OS is starved for RAM, causing overall sluggishness.

Why this answer

Type 2 hypervisors run on top of an existing OS and share resources with the host. The host OS needs sufficient RAM for itself; allocating too much to the VM can starve the host. The correct answer highlights the common mistake of over-allocating resources to a VM on a Type 2 hypervisor.

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6
MCQmedium

A company uses VMware vSphere to run multiple VMs on a single ESXi host. A user reports that their VM suddenly lost network connectivity, but other VMs on the same host are working fine. The technician checks the virtual switch configuration and finds that the VM’s virtual NIC is connected to a port group that has no active uplinks. What should the technician do to restore connectivity?

A.Reboot the ESXi host to refresh the network stack.
B.Change the VM’s virtual NIC type from E1000 to VMXNET3.
C.Add a physical NIC to the port group as an active uplink.
D.Disable and re-enable the virtual switch.
AnswerC

Adding an uplink connects the port group to the physical network, allowing the VM to communicate externally. This directly addresses the root cause.

Why this answer

In virtualization, a port group defines network settings for VMs. If a port group has no active uplinks, VMs in that group cannot communicate outside the host. The correct answer involves either adding an uplink or moving the VM to a working port group.

This tests understanding of virtual networking components.

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7
MCQmedium

A technician is configuring a virtual machine to host a database server that requires consistent high disk I/O performance. The host uses a RAID 10 array of SSDs. Which virtual disk type should the technician select to minimize overhead and maximize performance?

A.Dynamically expanding virtual disk
B.Fixed-size virtual disk
C.Differencing virtual disk
D.Thin provisioned virtual disk
AnswerB

A fixed-size disk pre-allocates all space, resulting in contiguous blocks and lower I/O latency, ideal for high-performance databases.

Why this answer

A fixed-size virtual disk (also called thick provisioning) allocates all required space at creation, reducing fragmentation and I/O overhead compared to dynamically expanding disks. This is best for performance-sensitive workloads like databases.

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8
MCQmedium

A user reports that a virtual machine running on a workstation is extremely slow, especially during high I/O operations. The host has 16 GB of RAM, an SSD, and a quad-core CPU. The VM is configured with 8 GB RAM and 4 vCPUs. What is the most likely cause of the performance issue?

A.The host does not have enough RAM for the VM
B.The VM has too many virtual CPUs assigned
C.The SSD is too slow for virtualization
D.The VM is using a dynamic disk instead of a fixed-size disk
AnswerB

Assigning 4 vCPUs to a quad-core host can cause CPU scheduling overhead; reducing vCPUs to 2 often improves performance.

Why this answer

This question tests resource allocation awareness. Over-allocating vCPUs can cause contention as the hypervisor tries to schedule multiple virtual CPUs on limited physical cores, leading to performance degradation. The correct answer is to reduce the vCPU count.

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9
MCQeasy

A technician is troubleshooting a VM that fails to boot with an error 'Operating system not found'. The VM was just created from an ISO file. What is the most likely cause?

A.The ISO file is corrupted
B.The VM's boot order is set to hard disk first, and the hard disk is empty
C.The VM has insufficient RAM
D.The virtual hard disk is not attached
AnswerB

If the boot order prioritizes the hard disk over the CD/DVD, the VM tries to boot from an empty disk and fails.

Why this answer

The boot order in the VM's BIOS must be set to boot from the CD/DVD drive (ISO) before the hard disk. If the ISO is not mounted or boot order is wrong, the VM cannot find an OS.

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10
MCQmedium

A user has a laptop with 8 GB of RAM and runs a Type 2 hypervisor to test a Linux VM. The VM is configured with 4 GB of RAM, but the user notices the host OS becomes sluggish whenever the VM is running. The technician checks resource usage and finds the host is using 6 GB of RAM before starting the VM. What should the technician adjust to improve performance?

A.Increase the host's virtual memory page file size
B.Reduce the VM's RAM allocation to 2 GB
C.Enable hyper-threading on the host CPU
D.Switch the VM's network adapter from NAT to bridged
AnswerB

This ensures the host has enough free RAM for itself and the VM, preventing excessive paging and improving responsiveness.

Why this answer

The host only has 2 GB free, but the VM requests 4 GB, causing the host to use swap memory. Reducing the VM's RAM allocation to 2 GB will allow both the host and VM to run within physical memory, avoiding swapping.

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11
MCQeasy

A small business runs a legacy application that requires Windows 7. The company wants to upgrade all desktops to Windows 11 while still running that application. Which virtualization solution would allow the application to run on the new OS without compatibility issues?

A.Install Windows 7 in a dual-boot configuration
B.Use a Type 2 hypervisor such as VirtualBox to run Windows 7 as a virtual machine
C.Deploy Windows 11 and use Windows 7 compatibility mode
D.Replace the legacy application with a cloud-based alternative
AnswerB

A Type 2 hypervisor runs on top of the host OS, allowing the legacy application to run in a virtualized Windows 7 environment without compatibility issues.

Why this answer

This scenario tests understanding of application virtualization, where a legacy OS runs as a guest on a modern host. Using a Type 2 hypervisor like VirtualBox allows Windows 7 to run inside Windows 11, solving the compatibility problem without hardware changes.

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12
MCQeasy

A company wants to move a physical server running a legacy application to a virtual machine on a new hypervisor. The application is sensitive to hardware changes and requires the exact same hardware identifiers. Which migration method should the technician recommend?

A.Virtual-to-Virtual (V2V) migration
B.Physical-to-Physical (P2P) migration
C.Physical-to-Virtual (P2V) migration
D.Clone to template
AnswerC

P2V converts a physical server into a VM, preserving hardware IDs and application compatibility.

Why this answer

Physical-to-Virtual (P2V) migration converts a physical machine into a virtual disk image, preserving the OS, applications, and hardware identifiers. This is the standard method for moving legacy systems to virtual environments.

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13
MCQeasy

A company uses virtual machines for its production environment. A technician needs to perform maintenance on the host server without disrupting the VMs. The technician wants to move the VMs to another host in the cluster while they are running. Which feature must be configured to allow this?

A.Virtual machine snapshots
B.Live migration (vMotion)
C.Virtual switch trunking
D.Resource pooling
AnswerB

Live migration enables moving a running VM to another host without interruption, which is exactly what the technician needs.

Why this answer

Live migration (vMotion in VMware, live migration in Hyper-V) allows moving running VMs between hosts with zero downtime. This is a key feature for high availability and maintenance. The correct answer directly names this feature.

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14
MCQmedium

An IT administrator is planning to deploy multiple virtual machines on a single host for a development team. Each developer needs a separate environment with different OS versions. The host has a quad-core CPU with hyper-threading enabled and 32 GB of RAM. The administrator wants to maximize resource utilization while ensuring performance isolation. Which virtualization feature should be configured?

A.Virtual machine snapshots
B.Resource pooling
C.Virtual switch VLAN tagging
D.Virtual machine cloning
AnswerB

Resource pooling lets the hypervisor manage CPU and memory across VMs, providing flexibility and isolation without overcommitting.

Why this answer

Resource pooling allows the hypervisor to dynamically allocate CPU and memory from a shared pool to VMs as needed, balancing load and ensuring isolation. This is ideal for development environments where demand varies.

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15
MCQeasy

A user reports that their virtual machine is running very slowly. The host system has 16 GB of RAM, and the VM is configured with 8 GB. The host is running a Type 2 hypervisor on Windows 10. The technician checks Task Manager and sees that the host is using 14 GB of RAM. What is the most likely cause of the VM's poor performance?

A.The VM's virtual CPU is overclocked
B.The hypervisor is not compatible with Windows 10
C.The host does not have enough free RAM to support the VM's needs
D.The VM's network adapter is set to NAT instead of bridged
AnswerC

With only 2 GB free on the host, the VM may be forced to use virtual memory (paging), causing severe performance degradation.

Why this answer

The host is running low on available RAM because the VM's allocated memory is not being released efficiently, or other host processes are consuming memory. In a Type 2 hypervisor, the host OS manages memory, and if it is oversubscribed, the VM will experience swapping and slowdowns.

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16
MCQmedium

A company uses a Type 1 hypervisor for production servers. A technician needs to migrate a running VM from one host to another without any downtime. Which feature should be used?

A.Snapshot the VM and restore on the new host
B.Use virtual machine cloning
C.Perform a live migration using the hypervisor's built-in feature
D.Export the VM as an OVF and import on the new host
AnswerC

Live migration transfers memory and state while the VM runs, ensuring zero downtime.

Why this answer

Live migration (vMotion in VMware) moves a running VM between hosts with zero downtime. This is a key feature of enterprise hypervisors for maintenance and load balancing.

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17
MCQmedium

A small business runs a single physical server hosting three virtual machines (VMs) for file sharing, database, and email. The server has 32 GB of RAM, and each VM is allocated 8 GB. Users report that the file-sharing VM is extremely slow. The hypervisor shows the host has 4 GB of RAM free. Which of the following is the most likely cause of the performance issue?

A.The hypervisor is not configured to use hardware-assisted virtualization.
B.The file-sharing VM’s virtual hard disk is stored on a slow USB 2.0 external drive.
C.The file-sharing VM has been allocated insufficient RAM and is experiencing memory ballooning.
D.The network switch port for the server is set to half-duplex.
AnswerC

Memory ballooning is a technique where the hypervisor reclaims RAM from VMs, causing performance degradation. With only 4 GB free, the host is likely ballooning memory from the file-sharing VM.

Why this answer

The scenario describes memory overcommitment, where the total allocated RAM (24 GB) plus the host overhead leaves only 4 GB free. The file-sharing VM is likely starved for memory because the hypervisor is swapping or ballooning memory to compensate. The correct answer identifies that the VM needs more RAM than currently allocated, which is a common virtualization performance bottleneck.

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18
MCQeasy

A technician is setting up a virtualized test environment where each virtual machine must have a unique MAC address and IP address, and the VMs must be able to communicate with each other and the physical network. The host has only one physical NIC. Which virtual switch configuration should the technician use?

A.Internal virtual switch
B.Private virtual switch
C.Bridged (external) virtual switch
D.NAT virtual switch
AnswerC

A bridged switch connects VMs to the physical network, enabling unique MAC/IP addresses and full network access.

Why this answer

A bridged (or external) virtual switch connects VMs to the physical network through the host's NIC, giving each VM its own MAC and IP address on the same subnet. This allows full communication with other VMs and physical devices.

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19
MCQhard

A virtual machine running a database server experiences frequent disk I/O bottlenecks. The host has multiple physical disks. Which configuration change would most effectively improve performance?

A.Increase the virtual disk size
B.Use a virtual disk on a network-attached storage (NAS)
C.Configure a pass-through disk for the VM
D.Enable disk compression on the virtual disk
AnswerC

Pass-through disks eliminate the hypervisor's I/O stack, providing near-native performance.

Why this answer

Pass-through disks give a VM direct access to a physical disk, bypassing the hypervisor's file system layer, reducing overhead and improving I/O performance for database workloads.

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20
MCQhard

A technician needs to deploy a virtual machine that will be used for a short-term project and then deleted. The VM must not consume excessive storage space initially. Which virtual disk type should be chosen?

A.Fixed-size (thick) virtual disk
B.Differencing disk
C.Thin-provisioned virtual disk
D.Dynamic expanding disk
AnswerC

Thin provisioning allocates only the space used, conserving storage for short-term VMs.

Why this answer

Thin provisioning allocates disk space on demand, starting small and growing as needed. This is ideal for temporary VMs to minimize initial storage usage.

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21
MCQmedium

A user complains that a virtual machine running on a laptop shuts down unexpectedly when the laptop is unplugged from power. The host has power management settings set to 'Balanced'. What is the most likely cause?

A.The VM's virtual BIOS is set to power off on AC loss
B.The host's power plan is set to 'Balanced', causing the host to sleep when unplugged
C.The VM is configured with insufficient RAM
D.The laptop's battery is failing and cannot supply power
AnswerB

A 'Balanced' power plan may put the host to sleep after a period on battery, which shuts down the VM abruptly.

Why this answer

Power management settings can put the host to sleep or reduce performance, causing the VM to crash or shut down. The VM relies on the host's power state; changing the plan to 'High Performance' prevents sleep.

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22
MCQhard

A company needs to deploy a virtualized environment where each VM must be isolated from others for security reasons, but all VMs share the same physical network. Which virtual networking configuration should be used?

A.Use a virtual switch with port groups assigned to different VLANs
B.Configure each VM with a different MAC address
C.Use bridged networking for all VMs
D.Assign each VM a static IP address from a different subnet
AnswerA

VLAN tagging on virtual switch port groups isolates traffic between VMs while sharing the same physical interface.

Why this answer

VLANs provide network isolation at Layer 2, allowing VMs on the same physical network to be separated logically. This is a common security practice in virtualized environments.

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23
MCQhard

A company plans to migrate a physical server running a legacy application to a virtual machine to reduce hardware costs. The application requires direct access to a proprietary PCIe card installed in the physical server. Which virtualization feature must the hypervisor support to allow the VM to use this card?

A.Virtual machine snapshots
B.Virtual switch VLAN tagging
C.PCI passthrough (VT-d/IOMMU)
D.Virtual machine migration (vMotion)
AnswerC

PCI passthrough allows a VM to directly use a physical PCIe device, which is essential for the proprietary card.

Why this answer

Direct access to physical hardware like a PCIe card requires hardware passthrough technology, such as Intel VT-d or AMD IOMMU. This allows a VM to directly control the device without going through the hypervisor. The correct answer tests knowledge of advanced virtualization features for hardware compatibility.

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24
MCQhard

A user reports that a VM running Linux suddenly displays a 'Kernel Panic' error after the technician applied a snapshot and then reverted to it. The snapshot was taken while the VM was running. What is the most likely cause of the kernel panic?

A.The snapshot file became corrupted due to insufficient disk space.
B.The VM’s virtual disk was configured as thin provisioned and ran out of space.
C.The snapshot captured the VM in a state where the file system was inconsistent (e.g., during a write operation).
D.The hypervisor’s time synchronization caused a clock skew.
AnswerC

Reverting to a snapshot taken while the VM was running can restore an inconsistent file system state, leading to a kernel panic on boot.

Why this answer

Taking a snapshot of a running VM captures the state of the virtual disk and memory, but if the file system is in an inconsistent state (e.g., during a write operation), reverting to that snapshot can cause corruption. The correct answer identifies that the snapshot was taken at an inopportune time, leading to file system inconsistency.

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25
MCQmedium

A technician is setting up a virtual machine for a developer who needs to test software across multiple OS versions. The VM must have direct access to a USB dongle for licensing. Which VM configuration setting must be enabled?

A.Enable USB 3.0 controller in the VM settings
B.Configure network bridging for the VM
C.Enable USB passthrough and attach the dongle to the VM
D.Install the dongle driver on the host OS
AnswerC

USB passthrough gives the VM direct hardware access to the USB device, which is required for licensing dongles.

Why this answer

USB passthrough allows the VM to directly access a physical USB device, bypassing the host OS. This is required for devices like dongles that need exclusive access.

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26
MCQhard

A technician is tasked with deploying a virtualized environment for a small office using a single server. The server has 64 GB RAM, two 6-core CPUs, and a RAID 10 array. The technician needs to run four VMs: a domain controller (4 GB), a file server (8 GB), a web server (4 GB), and a database server (16 GB). After deployment, the database server is performing poorly. The technician notices that the hypervisor has allocated 2 virtual CPUs to each VM. Which of the following is the most likely cause of the database server’s poor performance?

A.The RAID 10 array is not fast enough for database I/O.
B.The database server VM should have more virtual CPUs allocated, such as 4 vCPUs.
C.The hypervisor is using a Type 2 hypervisor, causing overhead.
D.The virtual switch is configured for 100 Mbps instead of 1 Gbps.
AnswerB

Database workloads are often CPU-intensive. With only 2 vCPUs, the VM may be competing with others; increasing vCPUs for the database server can improve performance.

Why this answer

The database server is likely CPU-starved because it has only 2 vCPUs while other VMs also have 2 vCPUs, leading to contention on the physical cores. The correct answer involves adjusting CPU allocation to match workload demands. This tests understanding of CPU scheduling in virtualization.

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27
MCQeasy

A small business wants to run three different operating systems on a single physical server to save space and power. Each OS must have its own dedicated CPU cores, RAM, and storage, and the hypervisor must run directly on the hardware without a host OS. Which type of hypervisor should be deployed?

A.Type 2 hypervisor
B.Container-based virtualization
C.Type 1 hypervisor
D.Emulation virtualization
AnswerC

A Type 1 hypervisor runs directly on hardware, allowing each VM to have dedicated resources and run different OSes without a host OS.

Why this answer

This scenario describes a Type 1 (bare-metal) hypervisor, which installs directly on hardware and allocates dedicated resources to each virtual machine. Type 1 hypervisors are used in data centers and server virtualization to maximize performance and isolation.

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28
MCQmedium

A technician is setting up a virtual lab on a laptop with 8 GB RAM and a dual-core CPU. The technician creates two VMs: one with 4 GB RAM and one with 2 GB RAM. The host OS is Windows 10. When both VMs are running, the laptop becomes unresponsive and the VMs are extremely slow. The technician checks resource monitor and sees that the host is using 95% of RAM. What should the technician do to improve performance without purchasing new hardware?

A.Enable hardware virtualization in the BIOS.
B.Reduce the RAM allocation of the 4 GB VM to 2 GB.
C.Convert the VMs to use dynamic memory allocation.
D.Move the VMs to a Type 1 hypervisor.
AnswerB

Reducing RAM allocation frees memory for the host and the other VM, improving overall performance. This is a quick fix without additional cost.

Why this answer

Over-allocating RAM to VMs on a host with limited memory causes swapping and poor performance. The best solution is to reduce the RAM allocated to the VMs or use dynamic memory allocation if supported. The correct answer focuses on adjusting VM memory settings, which is a practical troubleshooting step.

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29
MCQmedium

A technician is configuring a new VM for a developer who needs to test software on Windows 10. The host runs Hyper-V on Windows Server 2019. The developer requests that the VM have 8 GB RAM and 4 virtual CPUs. After creating the VM, the technician finds that the VM will not start and displays an error: 'The virtual machine could not be started because the hypervisor is not running.' What is the most likely solution?

A.Install the latest Windows updates and reboot the host.
B.Enable Intel VT-x or AMD-V in the host’s BIOS/UEFI settings.
C.Change the VM’s generation from Generation 2 to Generation 1.
D.Reinstall the Hyper-V role from Server Manager.
AnswerB

Hyper-V requires hardware virtualization extensions to be enabled. If they are disabled, the hypervisor cannot start, and enabling them resolves the issue.

Why this answer

Hyper-V requires the Windows Hyper-V role to be installed and the hardware virtualization features (VT-x/AMD-V) to be enabled in the BIOS. If the hypervisor is not running, it is often because virtualization is disabled in BIOS or the Hyper-V role is not properly configured. The correct answer addresses enabling virtualization in BIOS.

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30
MCQeasy

A company wants to consolidate five physical servers into one host to reduce power and cooling costs. Each server runs a different operating system. Which virtualization technology should be used to achieve this?

A.Install a Type 2 hypervisor on each physical server
B.Use a Type 1 hypervisor like VMware ESXi on a single host
C.Migrate all applications to a single OS using compatibility layers
D.Use containerization instead of virtualization
AnswerB

A Type 1 hypervisor runs directly on hardware, allowing multiple guest OSes to run efficiently on one physical server.

Why this answer

Server consolidation uses a Type 1 hypervisor (bare-metal) to run multiple VMs directly on hardware, maximizing resource utilization. This is the standard approach for data center virtualization.

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