Which Nutanix concept is responsible for accommodating and remediating node failure scenarios?

A company's security team has requested that all IT resources be hardened.
What should an administrator do to increase the security of the Nutanix environment?

A customer requires the ability to block all network traffic between their VDI VMs and their application VMs running on their Nutanix AHV clusters.
What Nutanix product would meet this requirement?

Protection Domains enable administrators to replicate which two items for Disaster Recovery? (Choose two-)

Refer to the exhibit.

An administrator has created a new VM, but when accessing the console to monitor the guest install, the administrator sees the error shown in the exhibit What is the likely cause of this issue?