What function does a router primarily serve within a network?

A router primarily serves the function of interconnecting multiple types of networks. It acts as a gateway that enables communication between different networks, such as between a local area network (LAN) and the internet. Routers analyze data packets, determine the best path for them to reach their destination, and forward them accordingly, ensuring that data can traverse various network types and protocols.

While increasing signal strength is essential for maintaining a reliable connection, this function is typically associated with devices like amplifiers or repeaters rather than routers. Filtering out unwanted packets is a function that can be performed by routers through access control lists or firewall functionalities, but it is not the primary purpose. Similarly, connecting devices within a single LAN is more characteristic of switches or hubs, which operate mainly at the local network level to manage data traffic among devices within that specific network.