What occurs when port forwarding is turned on and configured?

When port forwarding is turned on and configured, it results in the router having an open port. Port forwarding allows external devices, such as those connecting over the internet, to communicate with a specific device on a private network. This is done by directing traffic from a specific port on the router to the chosen port on a device within the network.

By configuring port forwarding, the router listens on that defined port for incoming traffic and forwards it to the appropriate internal IP address. This effectively opens up the designated port for incoming connections, allowing access to services such as a web server, gaming server, or CCTV system. Having an open port is essential for such functionalities to work, as it enables external users to reach services hosted on the internal network.

The other options represent states that do not accurately describe what happens when port forwarding is enabled and configured. A restricted port would not allow external connections, a random port would not facilitate specific traffic routing, and a disabled router would not function to forward any ports at all.