The ESXi console is very straightforward and provides easy keyboard navigation to access basic options. The most common use of the console is to configure the management network so that the host can be accessed from the network by vCenter and directly by the vSphere client management tool.
There are two primary areas to be highlighted with regard to security:
Troubleshooting mode
Lockdown mode
ESXi 5.5 must be installed on the physical host, and we must have direct access available to the keyboard and monitor in order to proceed with the local console steps. ESXi is part of the vSphere 5.5 download file and can be found at https://my.vmware.com/web/vmware/evalcenter?p=vsphere-55.