1) In the disadvantage of DHCPv6 section, you ought to mention that there is a ensure that the DHCP server always returns an up-to-date value for the address of the preferred recursive DNS server. In large networks, this is not trivial: the notion of which server is closest depends on routing configuration and on server status, all of which are dynamic. In contrast, the anycast approach guarantees that the request will reach the closest server.