What is the function of a core router in a network?

The function of a core router in a network is to connect multiple networks and transfer data efficiently. Core routers are typically utilized within the backbone of the internet or large networks, functioning at high speeds to forward packets between various interconnected networks. They are designed to handle a vast amount of data traffic efficiently, ensuring that data is transmitted quickly and effectively across different network paths.

Core routers operate at the network layer of the OSI model and do not connect end-user devices directly; instead, they interconnect distributed networks, including those managed by Internet Service Providers (ISPs) and large enterprises. This role is crucial for maintaining the overall performance and reliability of data transmission across multiple domains and can also involve managing routing protocols to optimize data flow across these networks.

The other options point to functions that do not align with the specific role of a core router. Connecting subnetworks within the same LAN pertains more to access or distribution layer devices. Managing user authentication relates to network security and access control, while prioritizing traffic is generally the responsibility of quality of service (QoS) mechanisms rather than a core routing function.