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nmap is a utility for port scanning large networks,
although it works fine for single hosts.
The guiding philosophy for the creation of nmap was
TMTOWTDI (There's More Than One Way To Do It). This is the
Perl slogan, but it is equally applicable to scanners.
Sometimes you need speed, other times you may need stealth.
In some cases, bypassing firewalls may be required. Not to
mention the fact that you may want to scan different
protocols (UDP, TCP, ICMP, etc.). You just can't do all
this with one scanning mode. And you don't want to have 10
different scanners around, all with different interfaces
and capabilities. Thus, nmap incorporates virtually every
scanning technique.
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