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352-001 · Question #635
352-001 Question #635: Real Exam Question with Answer & Explanation
The correct answer is B: Throttle timer. The throttle timer introduces a configurable initial delay before the routing protocol generates or propagates updates after a topology change, preventing instability from immediately flooding the network.
Question
Which feature must be part of the network design to wait a predetermined amount of time before notifying the routing protocol of a change in the path in the network?
Options
- ATransmit delay
- BThrottle timer
- CSPF hold time
- DInterface dampening
Explanation
The throttle timer introduces a configurable initial delay before the routing protocol generates or propagates updates after a topology change, preventing instability from immediately flooding the network.
Common mistakes.
- A. Transmit delay is an OSPF parameter that increments the age field of an LSA before transmission to account for propagation delay, and does not introduce a hold period before the routing protocol is notified of a path change.
- C. SPF hold time controls the minimum interval between successive SPF calculations within the routing process itself, not the delay before the routing protocol first receives or acts on a topology change notification.
- D. Interface dampening suppresses flapping physical interfaces using a penalty-based algorithm but operates at the interface layer and is distinct from a timer that delays routing protocol notification of a path change by a predetermined amount of time.
Concept tested. Routing protocol throttle timer delaying topology change notification
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