VirtualBox Interview Questions And Answers

VirtualBox Interview Questions And Answers. Here Coding compiler sharing a list of 16 Real-Time VirtualBox Interview Questions for experienced. These Oracle VM VirtualBox questions were asked in various interviews and prepared by industry experts. Learn Now!

VirtualBox Interview Questions

  1. What is Virtual Box?
  2. What is the use of virtual box?
  3. What are the benefits of using a virtual machine?
  4. Virtual box runs on which operating systems?
  5. Why is virtualization useful?
  6. What is Host operating system (host OS)?
  7. Guest operating system (guest OS)?
  8. What are VM groups?
  9. What is Clean architecture or unprecedented modularity?
  10. Virtual Box extension packages uses which file name extension?

VirtualBox Interview Questions Answers

VirtualBox Interview Questions
VirtualBox is an Open source software
VirtualBox is a Hypervisor for x86 computers
VirtualBox supported OS Windows, macOS, Linux and Solaris
VirtualBox developed by Oracle Corporation
VirtualBox author Innotek GmbH
VirtualBox has written in C, C++, x86 assembly language

1) What is Virtual Box?

A) VirtualBox is powerful Cross-platform Virtualization Software for x86-based systems.

2) What is the use of virtual box?

A) Running multiple operating systems simultaneously. VirtualBox allows you to run more than one operating system at a time. This way, you can run software written for one operating system on another (for example, Windows software on Linux or a Mac) without having to reboot to use it.

3) What are the benefits of using a virtual machine?

A) The main advantages of virtual machines: Multiple OS environments can exist simultaneously on the same machine, isolated from each other; Virtual machine can offer an instruction set architecture that differs from real computer’s; Easy maintenance, application provisioning, availability and convenient recovery.

We can create and run multiple Virtual Machines, running different operating systems, on the same computer at the same time. For example, you can run Windows and Linux on your Mac, run Linux and Solaris on your Windows PC, or run Windows on you Linux systems.

4) Virtual box runs on which operating systems?

A) Presently, VirtualBox runs on Windows, Linux, Macintosh, and Solaris hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista, Windows 7, Windows 8, Windows 10), DOS/Windows 3.x, Linux (2.4, 2.6, 3.x and 4.x), Solaris and OpenSolaris, OS/2, and OpenBSD.

5) Why is virtualization useful?

A) The techniques and features that VirtualBox provides are useful for several scenarios:

Running multiple operating systems simultaneously. VirtualBox allows you to run more than one operating system at a time. This way, you can run software written for one operating system on another (for example, Windows software on Linux or a Mac) without having to reboot to use it.

Since you can configure what kinds of “virtual” hardware should be presented to each such operating system, you can install an old operating system such as DOS or OS/2 even if your real computer’s hardware is no longer supported by that operating system.

Easier software installations. Software vendors can use virtual machines to ship entire software configurations. For example, installing a complete mail server solution on a real machine can be a tedious task.

With VirtualBox, such a complex setup (then often called an “appliance”) can be packed into a virtual machine. Installing and running a mail server becomes as easy as importing such an appliance into VirtualBox.

Testing and disaster recovery. Once installed, a virtual machine and its virtual hard disks can be considered a “container” that can be arbitrarily frozen, woken up, copied, backed up, and transported between hosts.

Infrastructure consolidation. Virtualization can significantly reduce hardware and electricity costs. Most of the time, computers today only use a fraction of their potential power and run with low average system loads.

Oracle VM VirtualBox Interview Questions

6) What is Host operating system (host OS)?

A) Host OS is the operating system of the physical computer on which VirtualBox was installed.

7) Guest operating system (guest OS)?

A) Guest OS is the operating system that is running inside the virtual machine.

8) What are VM groups?

A) VirtualBox provides a groups feature that enables the user to organize and control virtual machines collectively, as well as individually. In addition to basic groups, it is also possible for any VM to be in more than one group, and for groups to be nested in a hierarchy — i.e. groups of groups.

In general, the operations that can be performed on groups are the same as those that can be applied to individual VMs i.e. Start, Pause, Reset, Close (Save state, Send Shutdown, Poweroff), Discard Saved State, Show in fileSystem, Sort.

9) What is Clean architecture or unprecedented modularity?

A) VirtualBox has an extremely modular design with well-defined internal programming interfaces and a clean separation of client and server code. This makes it easy to control it from several interfaces at once: for example, you can start a VM simply by clicking on a button in the VirtualBox graphical user interface and then control that machine from the command line, or even remotely.

10) Virtual Box extension packages uses which file name extension?

A) VirtualBox extension packages have a .vbox-extpack file name extension.

VirtualBox Frequently Asked Interview Questions

VirtualBox Interview Questions # 11) What is the use of log file in Virtual Box?

A) One of the key tools you can use to diagnose any issues with VirtualBox is the VirtualBox log file for a vm session. VirtualBox always creates a log file which reflects the lifecycle of the virtual machine.

VirtualBox Interview Questions # 12) Where do you find log files in VirtualBox?

A) VirtualBox log files live in a per-user/per-vm standard directory that will be something like:

On Windows, this is “%HOMEDRIVE%%HOMEPATH%\\.VirtualBox\\Machines\\<vm name>\\Logs”; typically some- thing like “C:\\Users\\Username\\.VirtualBox\\Machines\\<vm name>\\Logs\\vbox.log”

On Mac OS X, this is “$HOME/VirtualBox/Machines/<vm name>/Logs”

On Unix-like systems (Linux, Solaris), this is “$HOME/.VirtualBox/Machines/<vm name>/Logs”

VirtualBox Interview Questions # 13) What is Software-based virtualization?

A) In the absence of hardware-assisted virtualization, VirtualBox adopts a standard software-based virtualization approach. This mode supports 32-bit guest OSs which run in rings 0 and 3 of the Intel ring architecture.

VirtualBox Interview Questions # 14) What is Hardware-assisted virtualization?

A) VirtualBox supports both Intel’s VT-x and AMD’s AMD-V hardware-virtualization. Making use of these facilities, VirtualBox can run each guest VM in its own separate address-space; the guest OS ring 0 code runs on the host at ring 0 in VMX non-root mode rather than in ring 1.

VirtualBox Interview Questions # 15) What is Device virtualization?

A) The system emulates hard disks in one of three disk image formats:

VDI: This format is the VirtualBox-specific VirtualBox Disk Image and stores data in files bearing a “.vdi” filename extension.

VMDK: This open format is used by VMware products such as VMware Workstation and VMware Player. It stores data in one or more files bearing “.vmdk” filename extensions. A single virtual hard disk may span several files.

VHD: This format is used by Windows Virtual PC, and is the native virtual disk format of the Microsoft Windows operating system, starting with Windows 7 and Windows Server 2008 R2. Data in this format are stored in a single file bearing the “.vhd” filename extension.

16) What are the different methods of Cloning virtual machines in Virtualbox?

Full clone: In this mode all depending disk images are copied to the new VM folder. The clone can fully operate without the source VM.

Linked clone: In this mode new differencing disk images are created where the parent disk images are the source disk images. If you selected the current state of the source VM as clone point, a new snapshot will be created implicitly.


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