Interview Questions.

Question 1. Do You Have Any Idea What Are The Actions That Has To Be Performed If Hardware Devices Are Not Recognized?

Answer :

If hardware gadgets are not identified by way of VirtualBox then first thing to do is to set the media change notification that notifies the person whilst his medium adjustments. Setting and configuration have to be changed such that it does not get turned off. 

Second element that can be performed is tweaking the registry of the system via going to:

HKEY_LOCAL_MACHINESystemCurrentControlSetServicesHardwareDeviceAutorun

This registry access will allow the hardware gadgets to be identified. Set the value as 1 to turn on the automatic notification.

Question 2. Can You Explain What Are Disadvantages Of Using Microsofts Rdp Client In Virtualbox?

Answer :

RDP customer is used to connect virtual machines. This RDP purchaser is likewise called as Remote Desktop connection. By using this purchaser the communique between the digital machines receives delayed. This delay is taking place because of the fact that RDP patron connects input for a fixed quantity of time earlier than sending it to the RDP server. The period of the time may be diminished down by means of the use of the registry key. If smaller values then the default fee then the length of delays may be behind schedule.

The registry documents that may be changed are as follows:

HKEY_CURRENT_USERSoftwareMicrosoftTerminal Server ClientMin Send Interval

The placing may be executed in the neighborhood device additionally.

HKEY_LOCAL_MACHINESoftwareMicrosoftTerminal Server ClientMin Send Interval.

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Question three. Tell Me How Are The Problems That Can Occur While Using Other Servers On A Single System Using Virtualbox?

Answer :

While the use of different servers like iSCSI server impasse can arise on the host system that try and run the iSCSI goal in a visitor virtual gadget. There are many flaws that can come inside an OS to response to the virtual device's request. Some troubles are due to cache manager element that gives some delays in the reaction related to an blunders. Till the time the error is coming the visitor gets blocked and unstability happens inside the virtual device itself. To resolve this problem surroundings variables may be set with the aid of setting the variable VBOX_DISABLE_HOST_DISK_CACHE to 1.

Question four. Do You Know What Are The Issues Faced By Virtualbox?

Answer :

VirtualBox uses the COM (Component object version) that's evolved via microsoft. It uses it for inter and intra system communique. This COM object lets in smooth sharing of common configuration between distinct digital machines and its methods. It provide many person interface choice to without difficulty customise the pics in keeping with their requirements. The consumer interface is based totally on a commonplace structure that includes all the configurations and standing information this is globally described by means of the technique VboxSVC. This technique is out-of-method COM server and terminates itself after few seconds. This unexpected behavior preserve the COM server jogging and hold the configuration files locked Due to this there are problems to save the configuration and settings for the person.

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Question five. Tell Me How To Setup The Virtual Machine With Nat Networking With Full Functionalities That Is Been Used By The Host System?

Answer :

NAT is referred to as as Network deal with translation and it features the identical manner. It just translates TCP or UDP applications. To setup NAT at the host device there is a requirement for IP protocol and the ping command that isn't always translated the use of this networking method. To set the NAT user need to set the DNS correctly that fits with the host device. DNS relay must be set to forward all DNS queries to look the proper machine as a server. The check may be performed by using placing all of the configuration by going to the browser and getting into the IP address of the guest.

If it would not paintings then placing of DNS must be achieved once more. Checking of the firewall must be seen to look that the connections aren't getting blocked and it is getting sufficient permissions to run its own IP through the virtual gadget.

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Question 6. Do You Know What Is The Process To Share Virtual Machines In A Dual Boot System?

Answer :

To proportion the virtual machines to distinct platform the VDI that is digital tool interfaces needs to be shared between each the OS so that they can examine and write the file. There is a provision to create a new virtual machine on a gadget and select the VDI from the host on that you are currently working and choose it as a difficult force with the same previous settings. The settings like MAC cope with and digital NICs cards additionally need to be identical to avoid the trouble of activation. 

To percentage the command that can be written is as follows:

Machine uuid= " some hex value" name= "name of your OS" OSType= "Type of OS you are the use of".

Question 7. Tell Me Is It Possible To Run Virtualbox Without The Need Of Any Operating System Like Vmware Esx Server?

Answer :

VirtualBox is a type-2 hypervisor and VMWare ESX server is type-1 hypervisor that runs as a bare steel (i.E. Immediately as an OS). Virtualbox is a standalone software this is used to run on an OS and uses the device kernel to communicate with the packages. The work is in procedure and Sun microsystem working at the VirtualBox which could run as OS and it is named as xVM server.

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Question eight. Tell Me What Are The Different Network Modes Used By Virtualbox?

Answer :

There are five types of network modes that is used by Virtual Box. These are as follows:

Unattached: it's far a mode where there may be no cable required to be connected to any gadget and there's a standalone gadget running the digital machines.
NAT (Network cope with Translation): is used to offer response where the extent IP addresses are low.
Network adapter host: it's far used whilst DHCP server isn't always being provided on VPN. In this manual configuration of IP addresses is being executed. For example Tftpd32: this is a community mode that works below home windows and used for IP configuration.
Internal network: paintings the same manner as bridge mode
Bridge: it is a community mode wherein the virtual machines can speak with the host system without any restrictions.
Question 9. Do You Know What Are The Similarities Between Virtual Box And Qemu?

Answer :

Virtual field makes use of qemu functionalities like digital hardware devices standards and the recompiler that is used with the qemu as its fallback mechanism. Quemu permits the usage of digital system screen that executes in real time and preserve the application at run time. It provides extra performance and excessive performance while used with virtual container.

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Question 10. Tell Me What Is The Function Of Release Log File?

Answer :

Release log file is being maintained the moment Virtual container starts up. It includes records about digital gadget configuration and the occasions that are being perfomed in the course of runtime. The log report that is being maintained is known as Vbox.Log. At the start of the startup of the digital machine the unique log file receives renamed to .1-.Three. These logs help to troubleshoot the hassle if any. It saves for every mistakes a different log which may be visible for the possible answers. It consists of diagnostics statistics like Host operating gadget, version of OS, and so forth.

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Question 11. Can You Explain What Is The Role Of Virtual Box Debugger?

Answer :

Virtaul field consists of in built debugger that debugs the digital system. This debugger controls and keeps the virtual device country. It supports symbolic symbols debugging that determines the guest working system version and locate the kernel symbols this is being utilized in visitor's reminiscence. Debugging commands are used to test, execute and locate the popularity of a image. Debuggers are vital as it affords essential errors that must be removed, to efficiently run the virtual machine example for debugging.

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Question 12. Tell Me What Is The Virtual Box Core Format For All Vms?

Answer :

Virtual box supports 32 bit and sixty four bit ELF layout for the middle files. The record is being controlled by means of VboxManage and the report that is getting used is debugvm. The core documents of the VM consists of memory and CPU dumps of VM.

The instance is given about the format of VM core beneath:

[ ELF 64 Header]

[ Program Header, type PT_NOTE ]

-> offset to COREDESCRIPTOR

[ Program Header, type PT_LOAD ]

-> Memory offset of variety

-> File offset

[ Note Header, type NT_VBOXCPU ] - one for every vCPU

[ vCPU 1 Note Header ]

[ CPUMCTX - vCPU 1 dump ]

[ Additional Notes + Data ] - currently unused

[ Memory dump ]

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Question thirteen. Do You Know What Is The Function Of Vboxclient?

Answer :

VboxClient is a process that creates files in the layout of .Vboxclient*.Pid within the domestic directory of the user. This helps manner to recognise that a system is already walking and it prevents every other carrier from beginning. This would not permit the deletion of the documents after the carrier of the method being stopped. The files are constantly owned through root. Once stopped it prevents the process to start in future.

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Question 14. Can You Explain What Are The Different Network Modes Used By Virtualbox?

Answer :

There are five types of network modes this is utilized by Virtual Box. These are as follows:

Unattached: it's miles a style where there is no cable required to be linked to any system and there is a standalone device jogging the digital machines.
NAT (Network cope with Translation): is used to give response where the level IP addresses are low.
Network adapter host: it's miles used whilst DHCP server is not being furnished on VPN. In this guide configuration of IP addresses is being carried out. For instance Tftpd32: this is a network mode that works under home windows and used for IP configuration.
Internal community: paintings the equal manner as bridge mode
Bridge: it's miles a network mode where the virtual machines can speak with the host gadget without any restrictions.
Question 15. Tell Me How To Provide Http Services Using Virtualbox?

Answer :

To offer the http services person need Virtual field visitor strolling on a NAT connection. The connection which is being setup uses HTTP port forwarding method to provide the http offerings. The http services may be furnished on the Virtual container guest the usage of the host computer via the usage of the http server strolling at the host and the usage of the port 5000.

The command that is used:

VboxManage modifyvm <guest_name> --natpf1 "any-call, tcp, , 5000, , 5000".

This command will permit the digital field guest gadget to communicate with the host device by means of forwarding all of the requests on localhost of the host the usage of port 5000.

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Question 16. Explain What Are The Effects That Can Be Caused If Virtual Kernel Module Doesn't Load?

Answer :

If the VirtualBox kernel module doesn't load then the mistake can be shown to the person pronouncing that "Error putting vboxdrv: Invalid argument". In this will the possibility that the kernel of the device won't have uploaded correctly. The trouble may be checked via dmesg command that tells the error due to which the failure has occurred. The kernel of the device has its very own set of configurations and it assessments the configuration of the virtualbox kernel to bring together the module.

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