Hi Eugene the DNS proxy is a stub resolver, this means it can receive and forward DNS queries to other (authoritative or recursive) DNS servers but can't act on its own. it enables you to reroute requests for certain zones to a DNS server of your choosing, and forward everything else to a different DNS a good example would be servers in a DMZ that need to know certain internal zones, but you don't want them accessing the internal DNS server directly. if you setup a DNS proxy that reroutes for example localzone.local to your internal DNS server, and forwards everything else to the external DNS, you make sure other zone information on your internal DNS servers is kept secret from the DMZ servers. it can also be set up to connect internal DNS servers with external ones, if you don't want them directly connecting to eachother, or if the internal DNS servers are not allowed outside of the network, as in your example regards
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