300-320 Question #40: Real Exam Question with Answer & Explanation

The correct answer is B: feasible successors. Feasible successors are pre-computed backup routes stored in EIGRP's topology table that are guaranteed to be loop-free (they satisfy the feasibility condition). When the primary route (the successor) fails, EIGRP can immediately promote a feasible successor to the routing table

Question

Which unique EIGRP feature allows for faster Layer 3 convergence?

Options

Afast EIGRP timers
Bfeasible successors
Chybrid routing protocol
DCisco proprietary protocol

Explanation

Feasible successors are pre-computed backup routes stored in EIGRP's topology table that are guaranteed to be loop-free (they satisfy the feasibility condition). When the primary route (the successor) fails, EIGRP can immediately promote a feasible successor to the routing table without running the DUAL algorithm or querying neighbors, resulting in near-instant convergence. This is EIGRP's most distinctive convergence advantage over other routing protocols.

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