Which of the following is NOT a function of a hub?

A hub is a basic networking device that primarily operates at the physical layer of the OSI model. Its main functions involve connecting multiple devices within the same network segment, but it does not connect different networks. The core functionalities of a hub include extending and repeating signals to ensure that data can travel across the various devices connected to it, as well as allowing communication within a local area network.

While it can extend signals and repeat digital signals, it does this primarily within a single network rather than bridging different networks. Prolonging cable lengths is an aspect of maintaining the physical connections of a network, enabling devices to communicate over longer distances when necessary. The distinction lies in the fact that hubs do not perform the more complex routing functions necessary to connect separate networks, which would require more advanced devices like routers.