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It will apply to all networks.
However...
If you connect to a network that doesn't support IPv6, then what it is going to do is to fallback to whatever IPv4 DNS is supplied in the DHCP settings for that network.
If you want to assert that you use Google DNS, you should fill in IPv4 DNS as well as IPv6 DNS.
Velocio
Cool. I get it now.
One more thing: do DNS settings manually entered in the OS apply to all networks you connect to or do you have to do it per network?