VMware Certified Professional - Data Center Virtualization (VCP-DCV) Practice Exam

When a vSphere 5.5 Client attempts to connect to an ESXi 6.x host, the operation prompts the administrator to run a script to upgrade the vSphere Client. This behavior is associated with the transition from earlier versions of vSphere to 6.x, which introduced several architecture and compatibility changes.

The vSphere Client from version 5.5 is not fully compatible with ESXi 6.x. Instead of outright failing or silently updating, the system prompts users to undertake an upgrade process. This ensures that administrators use a version of the client that is fully compatible with the features and functionalities provided by ESXi 6.x, maintaining the integrity of both management capabilities and host interactions.

This approach helps prevent issues that could arise from using outdated management tools on newer infrastructure, which could lead to operational difficulties or limited functionality. Therefore, the correct course of action requires the administrator to run a script that facilitates the upgrade of the vSphere Client to a version that is suited for managing ESXi 6.x hosts.