Thanks for the reply
Could you detail a topology of locations for Core router at data center-radius server billing server at our office.
It would be greatly appreciated
Thanks
As long as there is stable network connections, you can put your server anywhere you want. You will put the IP address of the radius server into the mikrotik. There are no rules about where you can put your equipment. Every company is different. Do what works for you, that is the great thing about networks... you can put many of your devices anywhere on the network that you want to.
Just make sure they are physically secure, they are on a good stable network connection (and power), and that you have 24/7 physical access to them in case you have an emergency during the night and have to access them.