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Question 7 - JN0-280 discussion

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When considering bidirectional forwarding detection, which two statements are correct? (Choose two.)

A.

The BFD default minimum interval is 3.

Answers
A.

The BFD default minimum interval is 3.

B.

You can configure BFD per interface within the protocol stanza.

Answers
B.

You can configure BFD per interface within the protocol stanza.

C.

The BFD operation always consists of minimum intervals and multipliers.

Answers
C.

The BFD operation always consists of minimum intervals and multipliers.

D.

The BFD default multiplier is 5.

Answers
D.

The BFD default multiplier is 5.

Suggested answer: B, C

Explanation:

Bidirectional Forwarding Detection (BFD) is a protocol used to detect faults in the forwarding path between two routers. It provides rapid failure detection, enhancing the performance of routing protocols like OSPF, BGP, and IS-IS.

Step-by-Step Breakdown:

Per Interface Configuration:

BFD can be configured on a per-interface basis within the protocol stanza (e.g., OSPF, BGP). This allows granular control over where BFD is enabled and the failure detection intervals for specific interfaces.

Minimum Interval and Multiplier:

BFD uses a minimum interval (the time between BFD control packets) and a multiplier (the number of missed packets before the path is declared down). The combination of these two defines the detection time for failures.

Juniper

Reference:

BFD Configuration: In Juniper, BFD is configurable within routing protocol stanzas, with the failure detection mechanism always based on minimum intervals and multipliers.

asked 10/10/2024
Jailson Batista
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