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

The primary function of a router in a network is to connect multiple networks and facilitate the routing of data between them. Routers operate at the network layer (Layer 3) of the OSI model and are essential for directing data packets from one network to another. They analyze the data packets' destination addresses and determine the most efficient path for the packets to travel towards their destination.

This routing process allows different networks, which may operate using various protocols, to communicate with each other effectively. Routers can also manage traffic loads, implement security measures through access control lists, and support dynamic routing protocols, which adjust routes based on current network conditions.

The other choices describe functionalities that are not the primary role of a router. Amplifying signals relates more to devices like repeaters or boosters, endpoint security is typically associated with firewalls and security software, and domain name resolution falls under the purview of DNS servers.