What action can an administrator take to access patch information without Internet access at vCenter Server?

The most effective action for an administrator to access patch information without Internet access at vCenter Server involves utilizing an offline ISO file to manually import patches. This method allows the administrator to obtain the required patches through pre-downloaded files and apply them wherever necessary.

Using an offline ISO file means that patch files can be downloaded from another internet-connected environment, then moved to the vCenter Server for installation. This is particularly useful in environments with strict security policies, where direct internet access is restricted, ensuring system updates can still be performed securely and effectively.

Other options including installing VMware vSphere Update Manager Download Service on either Linux or Windows servers are not directly addressing the issue of accessing patch information without internet connectivity at the vCenter. While these might assist in managing and downloading patches, they still rely on some form of internet access to fetch updates initially. Similarly, using a web server on the vCenter machine would not overcome the core issue of lacking internet access for updating patch information.