The additional software that must be installed is a device driver.
Explanation:
Device driver is a software program that is used to control a device connected to a computer.
If a user later buys a new type of device that the operating system did not recognize, new device driver will have to be installed just as in the given question when new NIC is installed. Device driver allows communication between hardware device and operating system.
So device driver will allow the OS to communicate with the new installed NIC.
