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The program Nslookup, is available on all operating systems and provides all types of information from a DNS server and allows you to query all types of information from a DNS server and change how your system uses DNS.
The network administration command-line tool nslookup can be used to verify that your DNS servers can resolve external domain names.
Answer:
Improved performance.
Reduced system load.
Protection for source code and programs.
Improved productivity and quality.
Portability of compiled programs.
SAA compliance checking.