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Question 42 - JN0-280 discussion

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Exhibit:

Referring to the exhibit, at which interval will the interface be considered down if no hello packets are received?

A.

2000 seconds

Answers
A.

2000 seconds

B.

400 milliseconds

Answers
B.

400 milliseconds

C.

400 seconds

Answers
C.

400 seconds

D.

2000 milliseconds

Answers
D.

2000 milliseconds

Suggested answer: D

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

multiplier: 5

Step-by-Step Breakdown:

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:

FailureInterval=minimum-intervalmultiplier\text{Failure Interval} = \text{minimum-interval} \times \text{multiplier}FailureInterval=minimum-intervalmultiplier

In this case:

400milliseconds5=2000milliseconds(2seconds)400 \, \text{milliseconds} \times 5 = 2000 \, \text{milliseconds} (2 seconds)400milliseconds5=2000milliseconds(2seconds)

Conclusion:

If no BFD control packets are received within 2000 milliseconds (2 seconds), the interface will be considered down, triggering OSPF to recalculate routes.

Juniper

Reference:

BFD Configuration: BFD parameters such as minimum-interval and multiplier are used to fine-tune the failure detection time for faster convergence.

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asked 10/10/2024
aakriti grover
51 questions
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