VMware Interview Questions and Answers

1Q) Explain The Difference B/w Clone And template in VMware?



2Q) What are the three port groups present in ESX server networking

Ans: 1. Virtual Machine Port Group - Used for Virtual Machine Network 2. Service Console Port Group - Used for Service Console Communications 3. VMKernel Port Group - Used for VMotion, iSCSI, NFS Communications

3Q) What is the use of a Port Group?

Ans: The port group segregates the type of communication.

4Q) What is the type of communications which requires an IP address for sure?

 Ans: Service Console and VMKernel (VMotion and iSCSI), these communications do not happen without an IP

address (Whether it is a single or dedicated)

5Q) In the ESX Server licensing features VMotion License is showing as Not used, why?   

Ans:  Even though the license box is selected, it shows as "License Not Used" until you enable the VMotion option for specific vSwitch


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6Q) How the Virtual Machineort group communication works? 

 Ans: All the VM's which are configured in VM Port Group are able to connect to the physical machines on the network. So this port group enables the communication between vSwitch and Physical Switch to connect VM's to Physical Machine's

 7Q) What is a VLAN?     

Ans: A VLAN is a logical configuration on the switch port to segment the IP Traffic. For this to happen, the port must be trunked with the correct VLAN ID.

 8Q) Does the vSwitches support VLAN Tagging? Why?      

Ans: Yes, The vSwitches support VLAN Tagging, otherwise if the virtual machines in an esx host are connected to different VLANS, we need to install a separate physical nic (vSwitch) for every VLAN. That is the reason VMware included the VLAN tagging for vSwitches. So every vSwitch supports up to 1016 ports, and BTW they can support 1016 VLANS if needed, but an ESX server doesn’t support that many VM’s. :)

 9Q) What is Promiscuous Mode on vSwitch? What happens if it sets to Accept?  

Ans: If the promiscuous mode set to Accept, all the communication is visible to all the virtual machines, in other words, all the packets are sent to all the ports on vSwitch If the promiscuous mode set to Reject, the packets are sent to the intended port so that the intended virtual machine was able to see the communication.

10Q) What is MAC address Changes? What happens if it is set to Accept ?

Ans: When we create a virtual machine the configuration wizard generates a MAC address for that machine, you can see it in the .vmx (VM Config) file. If it doesn't matches with the MAC address in the OS this setting does not allow incoming traffic to the VM. So by setting the Reject Option, both MAC addresses will remain the same, and the incoming traffic will be allowed to the VM.

11Q) What is Forged Transmits? What happens if it is set to Accept?

Ans: When we create a virtual machine the configuration wizard generates a MAC address for that machine, you can see it in the .vmx (VM Config) file. If it doesn't matches with the MAC address in the OS this setting does not allow outgoing traffic from the VM. So by setting Reject Option, both MAC addresses will remain the same, and the outgoing traffic will be allowed from the VM.

12Q) What are the core services of VC?

Ans: VM provisioning, Task Scheduling, and Event Logging

13Q) Can we do vMotion between two datacenters? If possible how it will be?

Ans: Yes we can do vMotion between two datacenters, but the mandatory requirement is the VM should be powered off.

14Q) What is a VC agent? and what service it is corresponded to? What are the minimum req's for VC agent installation?

Ans: VC agent is an agent installed on the ESX server which enables the communication between VC and ESX server. The daemon  associated with it is called VMware-hosted, and the service which corresponds to it is called as mgmt-VMWare, in the event of VC agent failure just restart the service by typing the following command at the service console

     " service mgmt-VMware restart "  VC agent installed on the ESX server when we add it to the VC, so at the time of installation if you are getting an error like " VC Agent service failed to install ", check the /Opt size whether it is sufficient or not.

15Q) How can you edit VI Client Settings and VC Server Settings?

Ans: Click Edit Menu on VC and Select Client Settings to change VI settings Click Administration Menu on VC and Select VC Management Server Configuration to Change VC Settings

16Q) What are the files that make a Virtual Machine?  

Ans:  .vmx - Virtual Machine Configuration File .nvram - Virtual Machine BIOS .vmdk - Virtual Machine Disk file .vswp - Virtual Machine Swap File .vmsd - Virtual MAchine Snapshot Database .vmsn - Virtual Machine Snapshot file .vmss - Virtual Machine Suspended State file .vmware.log - Current Log File .vmware-#.log - Old Log file

17Q) What are the devices that can be added while the virtual machine running?

Ans: In VI 3.5 we can add Hard Disk and NIC's while the machine running.

In vSphere 4.0 we can add Memory and Processor along with HDD and NIC's while the machine running

18Q) How to set the time delay for the BIOS screen for a Virtual Machine?

Ans: Right, Click on VM, select edit settings, choose the options tab, and select boot option, set the delay how much you want.

19Q) What is a template?

Ans: We can convert a VM into Template, and it cannot be powered on once it changed to the template. This is used to quick provisioning of VM's.

20Q) What to do to customize the windows virtual machine clone,?

Ans: copy the Sysprep files to the Virtual center directory on the server, so that the wizard will take the advantage of it.

21Q) What to do to customize the Linux/UNIX virtual machine clone,?

Ans: VC itself includes the customization tools, as these operating systems are available as open-source.

22Q) Does cloning from a template happens between two datacenters?

Ans: Yes.. it can, if the template in one data center, we can deploy the VM from that template in another datacenter without any problem.

23Q) What are the common issues with snapshots? What stops from taking a snapshot and how to fix it?

Ans: If you configure the VM with Mapped LUN's, then the snapshot failed. If it is mapped as virtual then we can take a snapshot of it. If you configure the VM with Mapped LUN's as physical, you need to remove it to take a snapshot.

24Q) What are the settings that are taken into consideration when we initiate a snapshot?

Ans: Virtual Machine Configuration (What hardware is attached to it) State of the Virtual Machine Hard Disk file ( To revert back if needed) State of the Virtual Machine Memory (if it is powered on)

25Q) What are the requirements for Converting a Physical machine to VM?

Ans: An agent needs to be installed on the Physical machine VI client needs to be installed with Converter Plug-in A server to import/export virtual machines

26Q) What is VMWare consolidated backup?

Ans: It is a backup framework, that supports 3rd party utilities to take backups of ESX servers and Virtual Machines. It's not a backup service.

27Q) To open the guided consolidation tool, what are the user requirements?

Ans: in components of the vCenter Server architecture. vSphere Client and Web Client: a user interface. SSO: a security domain in a virtual environment vCenter Server database: SQL server to store security roles, inventory resource pools, etc. Briefly discuss hypervisor and its types? A Virtual layer that enables multi-operating systems is known as Hypervisor and shares a single hardware host. Each VM is allocated physical resources like CPU, memory, storage, etc. by the host. There are two significant hypervisors types. (also known as Hosted Hypervisor) Bare-metal also was known as VMvisor is virtualization software and is installed directly onto the hardware and controls physical resources.