George is performing security analysis for Hammond and Sons LLC. He is testing security vulnerabilities of their wireless network. He plans on remaining as "stealthy" as possible during the scan…

While Nessus is primarily known for wired network and host-based scanning, it can perform some forms of wireless-related testing, particularly against devices on a wireless network once connected.

Nessus is an active vulnerability scanner designed to aggressively probe systems and services to identify weaknesses, which generates a significant amount of network traffic and distinct patterns. This 'loud' behavior makes it easily detectable by intrusion detection systems or network administrators, directly contradicting the goal of a stealthy scan.

There are indeed ways to perform relatively 'stealthy' wireless scans, such as passive monitoring or targeted, low-activity probes, although complete invisibility is difficult.

Nessus is definitively a prominent network vulnerability scanner, widely used for identifying security flaws.