How do most routers in large networks acquire their routing tables?

Most routers in large networks acquire their routing tables by automatically building and maintaining their own routing tables. This process typically involves using routing protocols such as OSPF (Open Shortest Path First), RIP (Routing Information Protocol), or BGP (Border Gateway Protocol). These protocols enable routers to communicate with one another, exchange information about network topology, and dynamically adjust to changes in the network.

By automatically updating their routing tables, routers can respond effectively to network changes, such as the addition or removal of routers or variations in network traffic. This dynamic nature of routing table updates significantly increases the efficiency and reliability of data packet routing within large networks, as opposed to relying on static or manually configured routes, which may not accurately reflect the current state of the network. Consequently, option B provides a reflection of the modern methodologies employed in network routing, emphasizing the importance of adaptability and efficiency in maintaining optimal data flow.