When conducting a port scan, what type of devices is most likely discovered if ports 80, 443, 515, and 9100 are responding?

The presence of responding ports 80, 443, 515, and 9100 during a port scan indicates specific services typically associated with printers. Port 80 and 443 are commonly used for HTTP and HTTPS traffic, which can be utilized by more advanced network printers that offer web-based management interfaces. Port 515 is associated with the Internet Printing Protocol (IPP), and port 9100 is broadly recognized as the default port for raw printing, which many network printers use for printing jobs.

This combination of open ports strongly suggests that the devices likely to be discovered are printers, particularly those that support network printing capabilities and offer web-based functionality. While web servers would typically respond on ports 80 and 443, they would not usually engage on ports 515 and 9100, making printers the more likely candidates in this context.