Consider the following Nmap output: What command-line parameter could you use to determine the type and version number of the web server?

The Nmap `-sv` (Service Version detection) command-line parameter instructs Nmap to attempt to determine the service running on open ports and its version number. This is crucial for identifying the specific type of web server (e.g., Apache, Nginx, IIS) and its version, which can then be cross-referenced with known vulnerabilities.

The `-Pn` (No ping) parameter skips the host discovery phase, treating all hosts as online, and is not used for service version detection.

The `-V` parameter (or `--version`) simply prints the Nmap version number and exits, it does not scan for service versions.

The `-ss` parameter (or `-sS`) specifies a SYN scan (stealth scan), which is a port scanning technique but does not perform service version detection.