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FIREWALL: SPLIT DNS
The intelligent Domain Name Server acts as the DNS server for the externally visible domain space, hiding internal detail, and acts as the internal domain name resolver. Domain Name Servers may be chained through departmental level firewalls, while the Distributed DNS mechanism tunnels DNS requests throughout firewalls in the same domain. Overall Internet performance can be enhanced by enabling the Asynchronous DNS Cache, which stores up to 2000 recently accessed names for instant retrieval.