Nmap scan type: TCP full connection, semi-connection, FIN scan instance, nmapfin

Nmap scan type: TCP full connection, semi-connection, FIN scan instance, nmapfin

1. Introduction to nmap:

Nmap is a network connection scanning software used to scan the network connection end opened by online computers. Determine which services are running on which terminals and infer which operating system the computer is running (also known as fingerprinting ). It is one of the necessary software for network administrators and is used to evaluate the security of network systems.

2. scan Method: nmap scan mainly includes TCP full-connection scan (records will be left on the scanned machine) and semi-connection scan (records will not be left ), FIN scan (you can determine the type of the other operating system ).

The differences between TCP full connection and semi-connection are as follows:

3. Full connection instance:

4. Semi-connect instance:

5. FIN scan instance:

6. Operating System Detection: