Networking modules are the electronic components, systems and devices used to connect two or more networks together. They can range from a simple Ethernet switch to a complex multi-layered router and provide network administrators with an easy way to configure and manage networks. Networking modules are used to build and manage local area networks, wide area networks, and metropolitan area networks. They are also used to bridge networks of different media types, such as WiFi, cellular, satellite and optical. Networking modules are also used to secure networks and enable continual traffic monitoring and performance optimization.