Final answer:
The port number used by Virtual Network Computing (VNC) to provide remote screen sharing between devices is 5900.
Step-by-step explanation:
The port number used by Virtual Network Computing (VNC) to provide remote screen sharing between devices is port 5900. VNC operates using the Remote Framebuffer (RFB) protocol, which by default connects to TCP port 5900 plus the number corresponding to the display number of the VNC server (e.g., display :1 uses port 5901). It's important for anyone configuring VNC to ensure this port is properly forwarded in the network and that any firewalls are configured to allow traffic through this port.
VNC uses a client-server model where the VNC server runs on the computer that shares its screen, and the VNC client runs on the computer that wants to view/control the shared screen. When a VNC client wants to connect to a VNC server, it needs to specify the IP address of the server and the port number where the server is listening.For example, if the VNC server's IP address is 192.168.1.10, the VNC client would connect to 192.168.1.10:5900 to establish a remote screen sharing session.