Which routing protocol provides the fastest convergence and greatest flexibility within a campus environment?

OSPF requires an SPF calculation after topology changes and, while fast, generally converges more slowly than EIGRP in a campus environment due to its link-state flooding mechanism.

IS-IS is a link-state protocol primarily used in service provider cores; it offers good scalability but is not optimized for campus environments and is less commonly deployed there.

BGP is a path-vector protocol designed for inter-domain routing with slow convergence characteristics - it is not appropriate for campus network routing due to its high overhead and slow failover.

EIGRP uses the Diffusing Update Algorithm (DUAL) to maintain Feasible Successors - pre-computed, loop-free backup routes that are installed instantly upon primary path failure without triggering a full recalculation. Its partial, bounded updates and flexibility in summarization and filtering make it ideal for campus designs requiring rapid convergence and operational simplicity.