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400-007 · Question #130
400-007 Question #130: Real Exam Question with Answer & Explanation
The correct answer is B: when numerous adjacent flaps of very short duration occur. Interface dampening is optimally used when an interface experiences many rapid, short-duration flaps to prevent routing instability from propagating through the network.
Question
Which optimal use of interface dampening on a fast convergence network design is true?
Options
- AWhen occasional flaps of long duration occur
- Bwhen numerous adjacent flaps of very short duration occur
- Cwhen the router hardware it slower than the carrier delay down detection
- Dwhen the switch hardware is faster than the debounce timer down detection
Explanation
Interface dampening is optimally used when an interface experiences many rapid, short-duration flaps to prevent routing instability from propagating through the network.
Common mistakes.
- A. 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.
- C. 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.
- D. 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.
Concept tested. Interface dampening use case for rapid repeated flaps
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