220-1201 Virtualization Concepts — Timed 20 Questions

Question 1

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?

Accepted Answer

The VM's IP address is configured as static and does not match the NAT subnet. 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.

Answer

The virtual switch is set to 'Internal'

Answer

The host's firewall is blocking all outbound traffic

Answer

The hypervisor needs to be reinstalled

Question 2

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?

Accepted Answer

The guest OS does not support symmetric multiprocessing (SMP) properly. 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.

Answer

The host's ECC RAM has detected a memory error

Answer

The VM's virtual disk is fragmented

Answer

The hypervisor's CPU scheduler is overloaded

Question 3

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?

Accepted Answer

The VM's BIOS UUID has changed from the physical server. 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.

Answer

The virtual switch is set to NAT, blocking the license server

Answer

The VM has insufficient RAM allocated

Answer

The hypervisor does not support the application's OS

Question 4

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?

Accepted Answer

Fixed-size virtual disk. 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.

Answer

Dynamically expanding virtual disk

Answer

Differencing virtual disk

Answer

Thin provisioned virtual disk

Question 5

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?

Accepted Answer

Reduce the VM's RAM allocation to 2 GB. 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.

Answer

Increase the host's virtual memory page file size

Answer

Enable hyper-threading on the host CPU

Answer

Switch the VM's network adapter from NAT to bridged

Question 6

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?

Accepted Answer

Physical-to-Virtual (P2V) migration. 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.

Answer

Virtual-to-Virtual (V2V) migration

Answer

Physical-to-Physical (P2P) migration

Answer

Clone to template

Question 7

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?

Accepted Answer

Resource pooling. 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.

Answer

Virtual machine snapshots

Answer

Virtual switch VLAN tagging

Answer

Virtual machine cloning

Question 8

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?

Accepted Answer

The host does not have enough free RAM to support the VM's needs. 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.

Answer

The VM's virtual CPU is overclocked

Answer

The hypervisor is not compatible with Windows 10

Answer

The VM's network adapter is set to NAT instead of bridged

Question 9

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?

Accepted Answer

Bridged (external) virtual switch. 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.

Answer

Internal virtual switch

Answer

Private virtual switch

Answer

NAT virtual switch

Question 10

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?

Accepted Answer

Type 1 hypervisor. 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.

Answer

Type 2 hypervisor

Answer

Container-based virtualization

Answer

Emulation virtualization

Question 11

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?

Accepted Answer

The VM has too many virtual CPUs assigned. 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.

Answer

The host does not have enough RAM for the VM

Answer

The SSD is too slow for virtualization

Answer

The VM is using a dynamic disk instead of a fixed-size disk

Question 12

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?

Accepted Answer

The VM's boot order is set to hard disk first, and the hard disk is empty. 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.

Answer

The ISO file is corrupted

Answer

The VM has insufficient RAM

Answer

The virtual hard disk is not attached

Question 13

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?

Accepted Answer

Use a Type 2 hypervisor such as VirtualBox to run Windows 7 as a virtual machine. 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.

Answer

Install Windows 7 in a dual-boot configuration

Answer

Deploy Windows 11 and use Windows 7 compatibility mode

Answer

Replace the legacy application with a cloud-based alternative

Question 14

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?

Accepted Answer

Perform a live migration using the hypervisor's built-in feature. 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.

Answer

Snapshot the VM and restore on the new host

Answer

Use virtual machine cloning

Answer

Export the VM as an OVF and import on the new host

Question 15

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?

Accepted Answer

Configure a pass-through disk for the VM. 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.

Answer

Increase the virtual disk size

Answer

Use a virtual disk on a network-attached storage (NAS)

Answer

Enable disk compression on the virtual disk

Question 16

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?

Accepted Answer

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

Answer

Fixed-size (thick) virtual disk

Answer

Differencing disk

Answer

Dynamic expanding disk

Question 17

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?

Accepted Answer

The host's power plan is set to 'Balanced', causing the host to sleep when unplugged. 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.

Answer

The VM's virtual BIOS is set to power off on AC loss

Answer

The VM is configured with insufficient RAM

Answer

The laptop's battery is failing and cannot supply power

Question 18

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?

Accepted Answer

Use a virtual switch with port groups assigned to different VLANs. 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.

Answer

Configure each VM with a different MAC address

Answer

Use bridged networking for all VMs

Answer

Assign each VM a static IP address from a different subnet

Question 19

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?

Accepted Answer

Enable USB passthrough and attach the dongle to the VM. 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.

Answer

Enable USB 3.0 controller in the VM settings

Answer

Configure network bridging for the VM

Answer

Install the dongle driver on the host OS

Question 20

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?

Accepted Answer

Use a Type 1 hypervisor like VMware ESXi on a single host. 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.

Answer

Install a Type 2 hypervisor on each physical server

Answer

Migrate all applications to a single OS using compatibility layers

Answer

Use containerization instead of virtualization