This document discusses advanced DNS topics including DHCP auto-updates, DNS security techniques like restricting zone transfers and using IP or crypto controls, the importance of running closed recursive resolvers to prevent amplification attacks, and other DNS uses like DNS blacklists and ENUM. Best practices for DNS include not mixing authoritative and caching servers, explicitly configuring options rather than relying on defaults, closing resolvers, documenting zone file changes, using $ORIGIN to specify the domain name, and being consistent with naming.