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BIND - Berkeley Internet Name Domain - most common DNS
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DNS is a distributed database that resides on different domain servers. There are primary, secondary, and cash-only servers
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Primary DNS server keeps the master copy of the entire (local) database both in memory and on disk
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Secondary DNS server obtains a copy of the database from the primary server
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Cash-only server: runs the name server software, but keeps no nameserver database files
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DNS server can provide lots of information about a network (nodes, operating system, people responsible, mail servers)
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DNS can provide "unwanted " information for
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hackers
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vendors' sales representatives
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outside agents
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