Basic vmware questions.....

1. Difference between VI3 and vSphere4 and what is the current updated version available.
2. Basic difference between ESX 3.x 3.5 & 4.x
3. What is a standard procedure to restart ESX host in production environment.
4. What is port group and explain the use of VMkernal
5. How to recover the root password in ESX?
6. Explain the difference between datacenter role and administrator role. Which would be more powerful?
7. What is the major role about the vmtools and what is the necessity to install the tool in windows and other OS.
8. Tell me some of the port number which are used for vCenter and ESX
9. What is the PSOD and how to fix it?
10. Explain HA and DRS and what are the pre-requisitive to configure both?
11. What is the min hardware requirement to install ESX 4.x
12. Default Partitions created while installing ESX server.
13. Steps to add the NFS share to ESX host.
14. What is the output of this commands esxcfg-vswif –l & esxcfg-vswitch –l ?
15. How to check the vmware version in esx host using command?
16. What is the use of vmsupport command?
17. What is the use of the following commands?
i. esxcfg-vswitch – L vmnic1 vSwitch0
ii. esxcfg-mpath –l
iii. esxcfg-mpath –b
iv. uname –r
18. Using command prompt check whether lun is connected ESX host.
19. Using cmd how to check the path of registered virtual machines file?
20. How to stop the virtual machine from command prompt?