Nessus is best described as?

• A. Nessus is a vulnerability scanner used to identify potential vulnerabilities in systems.
• B. Perimeter email gateway
• C. tcptraceroute tool
• D. XSS testing framework

Answer: (A)

Nessus is best described as a vulnerability scanner used to identify potential vulnerabilities in systems. It works by scanning hosts and networks with a large set of checks (plugins) to detect missing patches, misconfigurations, weak settings, default credentials, and other known weaknesses. The results are organized by severity and asset, helping security teams prioritize remediation and reduce risk. It isn’t a perimeter email gateway, which filters email traffic; it isn’t a tcptraceroute tool, which maps the network path to a host; and it isn’t an XSS testing framework, which focuses on web application input flaws.