JN0-281 · Question #16
Referring to the exhibit, at which interval will the interface be considered down if no hello packets are received?
The correct answer is D. 2000 milliseconds. The exhibit shows the configuration of Bidirectional Forwarding Detection (BFD) for OSPF on interface xe-0/0/4.0, with the following parameters: minimum-interval: 400 milliseconds BFD Liveness Detection: BFD is used to detect link failures at sub-second intervals, providing…
Question
Referring to the exhibit, at which interval will the interface be considered down if no hello packets are received?
Exhibit
Options
- A2000 seconds
- B400 milliseconds
- C400 seconds
- D2000 milliseconds
How the community answered
(59 responses)- A7% (4)
- B14% (8)
- C3% (2)
- D76% (45)
Explanation
The exhibit shows the configuration of Bidirectional Forwarding Detection (BFD) for OSPF on interface xe-0/0/4.0, with the following parameters: minimum-interval: 400 milliseconds BFD Liveness Detection: BFD is used to detect link failures at sub-second intervals, providing faster convergence times for routing protocols like OSPF. The minimum-interval is the time between BFD control packets (in milliseconds), and the multiplier indicates how many missed BFD packets trigger a failure. Calculating Failure Detection Time: The failure detection interval is calculated as: If no BFD control packets are received within 2000 milliseconds (2 seconds), the interface will be considered down, triggering OSPF to recalculate routes.
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