Disable internet access to 2012 domain controllers

Network or host-based Firewall (like Windows Firewall) will be able to block internet access

Blocking it from a Network layer is best

create root zone on domain controller, it will stop internet access  and internet name resolution from all domain controller

but is this your intention ?

That will stop internet name resolution, not internet access

it depends on how internet is accessed
After creating root zone On domain controllers, if proxy is used to access internet and if that proxy is not dependent on domain controller for name resolution, you can access internet,
otherwise if proxy is dependent on domain controllers for name resolution, you cannot access internet no matter if you have internet access on proxy or not and then this will be applicable to clients as well.

If there is no proxy defined, and domain controller only responsible for name resolution, still you cannot access internet, note that all clients will not be able to access internet as well

If there is no proxy defined, and domain controller only responsible for name resolution, still you cannot access internet

Of course you can, just not by name

it's too difficult to access internet by entering public ip addresses

Thanks Guys, All i need is just want to disable internet access only to DC's. Also we don't have a proxy.

then disable it on network level as suggested by shaun

Is there any specific configuration we need to consider?

u need to block outbound 80 & 443 from domain controller s towards extra net / internet

Thanks