NICs allow the computers to be physically linked with the network cable. They accommodate the mismatch in the speed with which the network transmits and that with which the CPU processes the incoming data. They handle the details of frame transmission or reception without requiring the CPU to handle each bit. A hub is a junction box that allows new computers to be connected to the network easily. They strengthen an attenuating signal passing through the network.
Some hubs can detect network problems and disconnect the faulty port or alert the network manager.
The NOS is the software that controls the functionality of the network. The server software provides functionality to the file, printer, or database server. It acts as the application software by executing requests sent to it by the clients. The Client software often runs in parallel with the client's own operating system. LAN Topologies Topologies refer to the way that networks are laid out, either physically or logically.