When placing a vSAN host into maintenance mode, choosing "Ensure Accessibility" ensures that all data remains accessible during the maintenance operation. It moves data off the host only if necessary, prioritizing accessibility while minimizing downtime. This option is designed to minimize the time required to complete the operation compared to "Full Data Migration."

Host Profiles allow administrators to create and apply configuration standards (e.g., networking, storage, security) across multiple ESXi hosts, reducing configuration drift and ensuring uniform settings.

Migrating VMs off hosts via vMotion (A), scheduling a maintenance window (C), and using NIC teaming (D) for redundancy help minimize downtime. Disabling DRS (B) can be detrimental if loads need rebalancing.

A Key Management Server (KMS) is required to manage encryption keys in the environment, ensuring that encrypted data is securely managed across ESXi hosts.
Creating an encryption policy in vCenter allows administrators to define how encryption is applied to virtual machines and data.
Applying the encryption policy to the existing VMs ensures that the encryption settings are enforced on virtual machines that require protection.

vRealize Orchestrator (vRO) is the workflow engine for automation and integration. Log Insight (A) gathers logs, vRealize Automation (B) offers self-service provisioning, and vRealize Operations (C) handles performance and capacity analytics.