These are few things which I check
1) Make sure BIOS settings is same on all host
2) Physical switch ports are properly confiured with the required vLAN, MTU, truck etc..
3) If using vSS make sure all the vSwitches and relevant port group are created
4) Required LUN's are mapped to the host
5) If you host profile in place apply that and check for any non-compliance issue
6) Perform HA test, vMotion, Storage vMotion with test VM's and make sure the VM's are able to network when on the new host