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  2. Service scan - Wikipedia

    en.wikipedia.org/wiki/Service_scan

    On the other hand, a network attacker may use a special type of service scanner, known as a vulnerability scanner, to find devices that have not been patched to find a known vulnerability. [8] An attacker may also use a service scanner to find open administrative ports such as Telnet on TCP/21 and SSH on TCP/22. Once an attacker finds those ...