Installing protection with AD

Hi all,

I’m working with a big network, they have an AD system and they’re using Cisco Aironet AP’s to create a WiFi network.

The fact is, I need to put a RADIUS Client and a Certification Authority on a server … I’m wondering if I can put it on the Domain Controller, or should I use an another server to do the job ?

Will everything works fine or not ?

Thanks in advance for every answers.