Banner Grabbing is a reconnaissance technique to discover network services by simply querying the service port. Many services will respond with a simple text message (known as a service banner) indicating the technology in use.
This banner search is a passive information gathering tool, no testing is performed against the IP address directly. The results are drawn from cached Internet Scan data.
https://hackertarget.com/banner-grabbing/
The main
distinction between scan types is between active and passive test routines. A scanning
technique to passively test security controls operates by sniffing network traffic to
identify assets communicating on the network, service ports used, and potentially
some types vulnerabilities. A passive scanner may also use limited interaction
techniques, such as banner grabbing.
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