Cisco Certified Network Associate (CCNA) Practice Exam 2026 - Free CCNA Practice Questions and Study Guide

EIGRP, or Enhanced Interior Gateway Routing Protocol, utilizes the Diffusing Update Algorithm (DUAL) for route selection. This algorithm allows EIGRP to efficiently manage routing information and calculate the best paths to various network destinations. DUAL ensures that EIGRP can quickly converge and maintain loop-free paths, making it particularly effective for large and complex networks.

The uniqueness of DUAL lies in its ability to keep track of multiple paths and provide a loop-free topology by maintaining backup routes and quickly switching to these alternate paths as necessary. This capability reduces downtime and ensures stability in the network.

Other algorithms mentioned, such as the Link State Algorithm and Distance Vector Algorithm, are characteristic of different routing protocols. While EIGRP has distance vector features, its use of DUAL differentiates it from traditional distance vector protocols by providing more advanced mechanisms for route selection and convergence. Therefore, recognizing DUAL as the algorithm EIGRP uses emphasizes its innovative approach to routing in comparison to other routing protocols.