Discussion
Which situation would primarily cause a router to choose a suboptimal path even though all routing protocols are functioning correctly ?
Answer: A
The cause is unequal cost metrics between heterogeneous routing protocols.
Each routing protocol measures paths in its own unit: RIP counts hops, OSPF uses a bandwidth-based cost, EIGRP a composite metric. When routes from different protocols meet on one router, or are redistributed from one protocol into another, the metrics cannot be compared directly. The router falls back on administrative distance or an assigned seed metric, and can end up preferring a longer path even though each protocol is working exactly as designed.
Redistribution loops and unacknowledged link-state packets are faults, so they contradict 'functioning correctly'. MTU mismatches cause fragmentation, dropped packets or failed adjacencies rather than a deliberate choice of a worse path.
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