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352-001 · Question #189
352-001 Question #189: Real Exam Question with Answer & Explanation
The correct answer is A: Interface dampening uses an exponential backoff algorithm to suppress event reporting to the. Interface dampening benefits a network by using exponential backoff to suppress flapping interfaces and by withholding further link events from upper protocol modules once an interface is dampened.
Question
In order to meet your service level agreement, your network designer created a design solution that includes interface dampening. In which two ways will interface dampening benefit your overall network design? (Choose two.)
Options
- AInterface dampening uses an exponential backoff algorithm to suppress event reporting to the
- BWhen the interface is dampened, further link events are not reported to the upper protocol modules.
- CWhen the interface is dampened, further link events are reported to the upper protocol module.
- DPeriodic interface flapping that affects the routing system as a whole should have a period shorter
Explanation
Interface dampening benefits a network by using exponential backoff to suppress flapping interfaces and by withholding further link events from upper protocol modules once an interface is dampened.
Common mistakes.
- C. This is the opposite of dampening behavior - the entire purpose of dampening is to stop reporting link events to upper protocol modules once the suppress threshold is reached, not to continue reporting them.
- D. A shorter flapping period increases the rate of instability events and worsens routing churn - this describes a condition that motivates dampening rather than a benefit it provides.
Concept tested. Interface dampening exponential backoff and event suppression
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