Cisco Certified Network Associate (CCNA) Practice Exam

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What does EIGRP use to maintain the topology of the network?

Routing Tables
Topology Tables
Neighbor Tables
Adjacency Tables

The correct answer is: Topology Tables

EIGRP (Enhanced Interior Gateway Routing Protocol) uses topology tables to maintain the network’s topology. The topology table stores all routes that EIGRP knows about, providing a comprehensive view of the network's paths and their associated metrics, such as bandwidth and delay. This information allows EIGRP to make optimal routing decisions based on the current state of the network. The topology table is critical for EIGRP's operations, particularly in terms of calculating the best path to a destination using the DUAL (Diffusing Update Algorithm) algorithm. When changes occur in the network, EIGRP can quickly adjust its routing decisions based on the data stored in the topology table. In contrast, other tables like the routing table primarily hold only the best routes to reach destinations, while the neighbor table keeps information about directly connected EIGRP neighbors. Adjacency tables, while relevant in other protocols, are not a primary feature of EIGRP's topological maintenance. Thus, the topology table plays a key role in enabling EIGRP to efficiently manage and optimize the network’s routing information.