Exam 400-007 topic 1 question 261 discussion

Actual exam question from Cisco's 400-007

Question #: 261
Topic #: 1

Two routers R1 and R2 are directly connected through an Ethernet link. Both routers are running OSPF. OSPF has been registered with BFD and BFD is running in asynchronous mode with the echo function enabled. Which two actions occur that are related to the echo function? (Choose two.)

A. BFD echo packets are sent from forwarding engines along the Layer 2 path to perform detection
B. BFD control packets are sent at a higher pace because the echo function is enabled
C. BFD sessions at either end actively participate in the forwarding of echo packets
D. BFD control packets are sent at a slower pace because the echo function is enabled
E. Only BFD control packets are sent from forwarding engines along the Layer 2 path to perform detection

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Suggested Answer: AD 🗳️

by Doobiedoo at Aug. 19, 2024, 7:55 p.m.

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Redrum702

9 months, 1 week ago

Selected Answer: AC

Answer is CD: In the scenario described, where BFD (Bidirectional Forwarding Detection) is running in asynchronous mode with the echo function enabled, the following two actions occur: A. BFD echo packets are sent from forwarding engines along the Layer 2 path to perform detection. C. BFD sessions at either end actively participate in the forwarding of echo packets. With the echo function enabled, the routers utilize the existing data path to send echo packets, allowing for faster detection of link failures. This leverages the forwarding engine for efficient monitoring of the connection.

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