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Vulnerability Scanners This lesson covers vulnerability scanners. Vulnerability scanners are tools that allow us to check and audit devices on our network to see if there are any known weaknesses. Two vulnerability scanners are Nessus and Nmap. Nessus scans for known vulnerabilities and provides account and auditing. It is run on a scheduled scan cycle. Nmap conducts scanning to look for open ports and protocols, services running on ports and OS fingerprinting.