How do routers acquire information about remote networks dynamically?

Routers acquire information about remote networks dynamically primarily through the use of routing protocols. These protocols are designed to facilitate the automatic exchange of routing information between routers in a network. By employing protocols such as OSPF (Open Shortest Path First), BGP (Border Gateway Protocol), or RIP (Routing Information Protocol), routers can learn about network topology changes, reachability, and the most efficient paths to various destinations.

Routing protocols allow routers to share routing tables and make adjustments without requiring manual intervention. This dynamic process helps ensure that routers can adapt to changing network conditions, such as additions or failures of networks and devices, maintaining optimal routing paths without the need for constant manual updates.

In contrast, the other choices involve methods that do not provide dynamic updates. Local device exchanges and static routing configurations rely on pre-defined routes and do not adapt to the current network state. Manual entry of routing paths is also static and does not support the dynamic nature required for effective routing in larger, more complex networks.