I have a Samsung Smart TV running Tizen OS, and out of curiosity I scanned it with Nmap. I found multiple open ports. One of those ports is running a "display" service. Does this mean it can cast its own screen, or that i can cast my screen to it?
While this isn't strictly a security question, I'm unsure if the Stack Exchanges for Super User or Networking would take this, so I'll just answer it quickly:
Depending on your options, nmap will return different results for ports because different steps for service reconnaissance are taken. Since you seem to use a GUI to
nmap and are asking a security beginners question, I'm assuming it's the default options, untweaked. In this case, per
/usr/share/nmap/nmap-services this is:
display 7236/tcp 0.000000 # Wi-Fi Alliance Wi-Fi Display Protocol
If the port does in fact match (unfortunately, you did hide that information from us), this is probably a Miracast instance.
From there you can see the direction the display sharing is supposed to work (emphasis mine):
Miracast is a standard for wireless connections from devices (such as laptops, tablets, or smartphones) to displays (such as TVs, monitors or projectors), introduced in 2012 by the Wi-Fi Alliance. It can roughly be described as "HDMI over Wi-Fi", replacing the cable from the device to the display.
Does this mean it can cast its own screen, or that i can cast my screen to it?