Intense scan is a very detailed, comprehensive scan. Logically, this means the intense scan may take up much more time scanning than the others will probably take, though it may come in useful when you want accurate results. This scan does the following scans and detections to reach the most accurate result as possible:

Let's cover these first. OS detection does a detailed detection of operating system running on a host. Nmap does this scan by stack fingerprinting, which works by sending series of TCP/UDP packets and then monitoring the response from the target. This scan is one of the best-known scans of Nmap. More about OS detection is given on the following pages.

The version detection is, described by Nmap, a high speed, parallel the operation via nonblocking sockets and a probe definition grammar designed for efficient yet powerful implementation. Version detection determines the application name and version number where...