For EIGRP to maintain loop-free alternate paths, the feasibility condition must be met:
A. The Reported Distance (RD) must be lower than the router's Feasible Distance (FD).
E. A feasible successor must exist (i.e., an alternate next-hop satisfying the feasibility condition).
This design allows immediate failover without recomputation, ensuring fast convergence — a critical CCDE v3.1 protocol design principle.
Why other options are incorrect:
B, C, D: Misstate the feasibility condition or confuse RD and FD relationships.
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