Hi i am new to VMWare,
Is it Possible to add multiple versions of ESXIs to Vcenter.
Yes you can. Check this two: https://blogs.vmware.com/vsphere/2011/10/mixing-esxesxi-versions-in-an-hadrs-cluster.html & FDM in mixed ESX and vSphere clusters - frankdenneman.nl
Do you already have a VMware infrastructure? Or planning to create one?
In general yes, just make sure that the vCenter is compatible with the Host is.
Check VMware Product Interoperability Matrices for more information.
-- Ben
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