Which optimal use of interface dampening on a fast convergence network design is true?

Occasional flaps of long duration do not generate the rapid penalty accumulation that dampening is designed to suppress, and such infrequent events are better handled through carrier delay or routing protocol hold-down timers.

Interface dampening accumulates penalty values each time an interface flaps and suppresses the interface once a configured threshold is crossed, preventing downstream routing protocol churn. When numerous consecutive flaps of very short duration occur in quick succession, the penalty accumulates rapidly and triggers suppression before the instability can propagate to the rest of the network. This rapid repeated flapping scenario is the primary design use case that interface dampening addresses.

A mismatch between router hardware detection speed and carrier delay timers is a detection timing issue, not the flap-storm scenario that interface dampening is designed to mitigate.

Debounce timers handle hardware-level physical signal bouncing at the interface layer, which is a separate mechanism from the network-level flap suppression that interface dampening provides.