Scripted installation is an efficient way to provision multiple ESXi host. This video explains how to use a kickstart file to install or upgrade ESXi. Both Shift-O invocation and PXE boot are supported.
The ESXi management interface is protected by a firewall that is enabled by default. This video provides a high-level overview of the ESXi firewall and how you can use it to best protect the hosts in your environment.
This video explores the concept of Virtual Machine Snapshots so that you can understand and troubleshoot problems relating to Snapshots.
Be sure to read the full content of the KB article for additional information: “Understanding Virtual Machine Snapshots in VMware ESX and ESXi(1015180)” at http://kb.vmware.com/kb/1015180