Hi
We know is good(for Experts earn points) that you ask all this questions, but most of them you can get just googling
Try to read some documentation about VMware virtualization environments
Thats my opinion
http://virtualizationreview.com/blogs/everyday-virtualization/2009/09/esxi-lockdown-mode.aspxhttp://www.doublecloud.org/2010/08/manage-lockdown-mode-with-new-api-in-vsphere-4-1/Jail