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If you send a UDP packet to a closed port on a server, the TCP/IP stack is supposed to send an ICMP port unreachable message back.
It is a free, open source application available on all UNIX and Windows operating systems.Auditors can use Nmap to get a quick idea of what hosts and services are available on a network.It can be used to scan a single subnet or much larger networks.There's more to network security than just penetration testing.This chapter discusses software tools and techniques auditors can use to test network security controls.
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If you execute Nmap with its default settings, and assuming you have root privileges, Nmap performs a SYN scan: Nmap sends a SYN to all of the ports listed in its services file (over 1,000 ports) and looks for a SYN/ACK response.