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Like most tools used in computer security, Nmap is useful to both system administrators and crackers (or script kiddies). System administrators can use it to test for possible unauthorized servers in the workplace, whereas crackers use it to "scope out" a potential target.
Nmap is often confused with a host vulnerability assessment tool such as Nessus. Nmap is stealthy, built to evade intrusion detection systems, and less likely to interfere with the normal operation of the networks or computers being scanned.
Nmap was also used in The Matrix by the character Trinity to help hack into a power plant through the SSH1 CRC32A cyclic redundancy check (CRC) is a type of hash function used to produce a checksum which is a small integer from a large block of data, such as network traffic or computer files, in order to detect errors in transmission or duplication. CRCs are calcul exploit (discovered in 20012001 is a common year starting on Monday (see link for calendar), and also: The International Year of the Volunteer The United Nations Year of Dialogue Among Civilizations Events January January 1 A black monolith measuring approximately nine feet tall ap).