Network Cards
A card for a PC that connects the computer to the network. Includes networking software drivers to support popular network software.

Hubs
If more than two devices are to be networked, a hub is the central device into which all networks cables are connected. Hubs typically connect from 4-24 devices and can be "stacked" or "cascaded" together for more capacity.

Switches
Used to segment networks into smaller connected subnets. Networks can easily overload: switching them into separate subnets can enhance performance easily and inexpensively while preserving existing investments.

Routers
Link local network to some form of remote network. Used for Internet access, LAN-to-LAN connections of a wide area (intranet), or high speed remote access for a user or a branch office over an ISDN line.