Final answer:
The command 'nmap -sV --version-intensity 8' is used for aggressive service version detection on a target host or network, potentially providing detailed information about services running on open ports.
Step-by-step explanation:
The command nmap -sV --version-intensity 8 is used in network security and administration to perform service version detection on a target host or network. The service version detection capability of nmap provides information about the services running on open ports of a target machine. The --version-intensity 8 option adjusts the intensity of this detection process.
Specifically, setting the version intensity to 8 tells nmap to perform deeper and more aggressive service detection, potentially providing more detailed information about the services and protocols in use. However, this thorough scan might take longer to execute and could be more intrusive, which might raise flags in intrusion detection systems. It's important to have authorization before scanning networks to avoid legal issues.