Hi @buzzra ,
If you did not configure something in DNS, DHCP, Firewall sections, nothing will happen.
If you let the configurations "as is", the NS Server will not interfere with the other servers that you have in your network.
Anyway, there are some common things for any app, OS, hardware/software router/firewall/UTM, ... Even there are modules and/or services installed and if all or some of them are enabled, if you don set rules, nothing's happen.
How do you intend to use NS in your network? For which functions/services?
Maybe we can help you better if you will give us more details.