In the present era, the majority of the organization demands the best expert to manage business process and operation. They need to recruit top talent guys to improve the growth of the business. The candidates are selected through the technical VMware Interview Questions and other processes. VMware is the leading cloud technology and virtualization and offers the best solution to desktop and network virtualization. If you are a fresher or experience looking for the interview question regarding VMware, you are landed at the right place and read the important questions. It is a great opportunity for you to move ahead of career with VMware Certification. In this article, we list out the question asked in an interview about the subject that aids you to gain a dream in the organization.
If you are shortlisted for VMware interview and wants an all-round preparation for the same in order to clear the VMware Interview Questions in the first shot, then you have come at the right place. We at SSDN Technologies provide frequently asked questions on VMware both for Experienced as well as Fresher candidates. These set of questions are asked by VMware interviewers of top IT companies and MNCs, which comprises of various sections on VMware, providing a lot of opportunities to the candidates as it currently holds about 0.5% market share per research.
As we all know that VMware is the leader in Virtualization and Cloud Computing Technologies, which also offers solutions in the field of network and desktop virtualization. And, because of implementation of virtual environment to merge the available hardware, the demand for VMware experts have increased considerably in the market. Besides the initial HR round, technical interview round is also conducted by VMware professionals or masters to assess the interviewee’s abilities and knowledge in the field of virtualization for continued business process.
So, below we have answered top 20 trending questions that are asked in a VMware Interview Questions and virtualization technology, which are applicable for both freshers and experienced professionals to examine their technical knowledge and hands on expertise.
VMware is the process of virtualization of different kinds of operating system that used for one or more workstation and server. It surely meets the demands of various applications and software for the virtualization. The VMware products are differentiated into two different levels like server application and desktop application. Moreover, it is used for running application or operating system in a single system. It helps the IT industry to simplify the process of operation and speed up the new application.
It is the process of developing a virtual version of physical elements like a storage device, server, network devices, and others. These kinds of elements run on a physical host known as virtualization. This one allows different virtual machine run on the single machine which named as ESXi host.
VMware manages different kinds of virtualization that used for the different purpose in the industry. Below are the kinds of virtualization that offer VMware
(i) Server Virtualization:
It allows the different operating system to run on a single server that highly efficient for the virtual machine. It provides ideal benefits to the industry.
• It improves the efficiency of IT business operation
• It minimizes the cost of operation
• It is suitable for quick workload deployment
• It is better to improve the performance of the application
• It reduces server damage and complexity
(ii) Network Virtualization:
It lets application to run on a virtual server if application runs on the physical network. It gives greater operational benefit to the industry. This one is used for different purposes like
• Running protocol analyzer
• Logical Ports
• Load Balancer
• Firewalls and others
(iii) Application Virtualization:
Application runs on the host and installed in different forms. This could be accomplished by application streaming, VDI, or desktop virtualization. It is suitable for increasing mobility of different applications and permits migration of VM from the host. It minimizes downtimes of application.
(iv) Presentation Virtualization:
From this virtualization, ICA protocol and Microsoft terminal services are developed. Any application can run on the host and allows the client to view in the screen and gains details of running the place.
(v) Storage Virtualization:
The disk storage of data is combined and maintained by the virtual storage system. It offers abstraction layer that ideal for physical storage to maintain and optimize in virtual deployment.
VMware is considered to be the best standard for virtualization. It provides the widest range of solution that better for the business to improve the growth in a simple way. Here are the popular solution offered by VMware like
(i) VMware Vcenter Site Recovery Manager:
This is very useful to keep the system running in case any failure occurs in hardware components. Whether the physical server is damaged, all the data and files automatically shift to another server. It provides constant system availability and never minimizes uptime when waiting for any resource to fix the issues in the crashed server.
(ii) VMware Vcenter Server:
The solution helps you to minimize a number of the physical server that business needs to have. With the virtualization of different servers, this will reduce the need of service and decrease storage space in server. It is better to lower the energy bill.
(iii) VMware Vcenter Lab Manager:
It lets anyone to test different things like system configuration, software, and updates without compromising time and effort to change workstation.
(iv) VMware View:
It is a simple solution that maintains desktop workstation and also creates a workstation virtual. Updates and software installations are handled at a single place. This will help you to save and money. It is simply and easy to manage, support and provides complete control of workstation.
It acts as a virtualization layer that accommodates various operating systems to share single hardware. Each and every operating system manages the physical components like CPU, memory, storage and lot more. There are different kinds of hypervisors such as
• Hosted hypervisor
• Bare metal hypervisor
VMKernal acts as a virtualization interface between a Virtual Machine and the ESXi host that is responsible for storing VMs. All the available resources of ESXi host such as memory, CPU, storage, etc. are allocated to VMs by VMKernal. VMKernal is also responsible for controlling special services like vMotion, Fault Tolerance, NFS, traffic management and iSCSI. It is impossible for hosted VMs to communicate with ESXi server without the help of VMKernel.
Fault Tolerance or FT is an important element of VMware vSphere. Its work is to provide continuous availability for VMs at the time of an ESXi host failure. Fault Tolerance is bandwidth intensive and requires 10GB NIC to configure it. FT is useful in creating a complete copy of an entire VM, such as storage, compute and memory. In VMware vSphere 6.0 version, FT can support up to 4 vCPUs and 64 GB RAM/Memory.
The copied version of a virtual machine is called a clone. If a VM is cloned, time is saved when multiple VMs with the same configurations are required to be configured. Whereas, the master copy of an image created from a VM is known as a template that can be used to create numerous clones in the future. Once a VM is converted to a template, it cannot be powered-on or edited.
VMware Tools is a house of utilities that are aimed to enhance the Virtual Machine’s performance of guest operating system and to improve Virtual Machone’s management. Following issues are either improved or eliminated after installing VMware Tools, which are-
● Low video resolution
● Incorrect display of network speed
● Inability to copy and paste and drag & drop files
● Synchronization of time in the guest operating system with the time on the host, and more.
Distributed Resource Scheduler or DRS is a tool that dynamically balances available resources across various hosts with the help of Cluster or resource pool. VMware DRS permits users to formulate the rules and policies that are going to fix the manner in which VMs will be sharing the resources and how these resources are prioritized among multiple VMs.
Distributed Power Management or DPM of VMware DRS that is used to monitor required resources in a cluster. At times when resources gets decreased due to low usage, VMware DPM merges workloads and shut down the hosts that are unused, and when the resources are increased, it automatically power on the unused hosts.
VMware HA or High Availability works on the host level and configured on the Cluster. In case of any host level failure, a Cluster configured with HA will automatically migrate and restart all the VMs running under any of the host to another hoat below the identical Cluster. ALL ESX Server hosts in a cluster are monitored by VMware HA and they also detect failures.
vSphereHA is independent of vCenterserver for its operations because when HA is configured, an agent is installed into each host who performs its part of function independent of vCenterserver. In any case of host failure, HA does not use vMotion, as it just starts VMs into another host.
Whereas, vSphere DRS is dependent on vCenterserver since it uses vMotion for its activities of live migration of VMs between multiple hosts. So, if vCenterserver goes down, then the vMotion would also stop working leading to DRS failure.
It is not necessary for vCenterserver to be online for Fault Tolerance (FT) to work when FT is configured for a Virtual Machine. Failover would take place from the Primary to the Secondary Virtual Machine, even when vCenterserver is offline. In addition to this, spawning of a new Secondary Virtual Machine also take place in the absence of vCenterserver.
Promiscuous mode in VMware is a security policy, which are describable at the virtual switch or port group level. Use of promiscuous mode in a virtual machine, Service Console or VMKernel network interface in a port group helps it to see all network traffic traversing the virtual switch. If the promiscuous mode is set to reject, the packets are sent to the intended port so that the targeted virtual machine will only be able to see the communication.
VMware VMotion helps in live migration of running virtual machines from one physical server to another with zero downtime. The entire pool of resources is automatically optimized and allocated by VMotion to get maximum hardware utilization and to perform hardware maintenance function without any scheduled downtime. It proactively migrate virtual machines away from failing or underperforming servers.
When any of the hosts inside a cluster fails, then all the virtual machines running under it are restarted on different host under the same cluster with the help of VMware HA. For this migration of VMs to different host, VMware HA is completely dependent on vMotion. So the only use of vMotion is to assist in the migration process between multiple hosts. vMotion is laos capable enough to migrate any VM to any of the host inside the cluster without interrupting its state.
A person can only place the original or the Primary virtual machine. He has full control with DRS or vMotion to assign it to any node. When Secondary virtual machine is created, it is placed automatically on the basis of the available hosts. But at the time of creation and placement of Secondary VM, the person can vMotion it to the preferred host.
VDI is an acronym for Virtual Desktop Infrastructure where end user physical machines, such as desktop or laptop are visualized because of which VDI is described as “delivering dtops from the data center” by VMware. Once VDI is used, with the help of a device called thin client the end user can connect to their desktops.
A “point in time image” of a virtual operating system (VM) is known as snapshot. This snapshot contains an image of the VMs disk, RAM, and devices at a time when they were taken. With the help of this snapshot, a person can return the VM to that point in time, whenever you choose. The snapshot functionality can be used for features, such as performing image level backups of VMs without the need of shutting them down.
The main difference between VMware HA and FT is that- VMware HA is enabled per cluster and VMware FT is enabled per VM. In case of VMware HA, when a host failure occurs, the VMs restarts and is powered on another host under the same cluster. Whereas, in VMware there is no downtime since the second copy is activated automatically in case of host failure.
The three port groups that are configured in ESXi networking are as follows-
● Virtual Machine Port Group: This is used for Virtual Machine Network
● Service Console Port Group: This is used for Service Console Communications
● VMKernel Port Group: This is used for VMotion, iSCSI, NFS Communications
vCenterserver architecture has three main components, which are as follows-
● vSphere Client and Web Client: Which is a user interface
● vCenter Server Database: SQL server or embedded PostgreSQL to store inventory, security roles, resource pools, etc.
● SSO: Which is a security domain in a virtual environment
There are three types of disks in VMware that are as follows-
1.) Thick Provision Lazy Zeros: In this disk format, every virtual disk is created by default.
2.) Thick Provision Eager Zeros: This type of disk is used in VMware Fault Tolerance.
3.) Thin Provision: This disk type provides an on demand allocation of disk space to a VM.
vSphere 6.0 has three licensing options, which are explained below-
1.) Standard Edition: This license contains 1 vCenter Server Standard license, up to 2 vCPUs for FT, vMotion, Storage vMotion, HA, VVols, etc.
2.) Enterprise Edition: It is the same as Standard Edition license with only an additional feature of APIs for Array Integration and Multipathing, DRS, and DPM.
3.) Enterprise Plus: This license includes all the features of Standard and Enterprise Edition with only an additional feature of Fault Tolerance up to 4 vCPUs and 64 GB of RAM. It also comprises of Distributed vSwitch and is the most expensive licensing option of vSphere 6.0.