300-415 Question 40
Single answerAn enterprise is deploying Cisco SD-WAN and needs to configure Bidirectional Forwarding Detection (BFD) for tunnel health monitoring between two WAN Edge routers. Which statement about BFD behavior in this scenario is correct?
- A
BFD sessions are established automatically on all Cisco SD-WAN tunnels, and their timers are adjustable.
- B
BFD can only operate if explicitly configured on each individual tunnel between Cisco SD-WAN devices.
- C
BFD requires a separate configuration for monitoring control plane traffic in Cisco SD-WAN.
- D
BFD in Cisco SD-WAN operates at the application layer to monitor the performance of specific applications.
Show answer and explanation
Correct answer: A
Explanation
In Cisco SD-WAN, BFD is a critical protocol for monitoring the health of data plane tunnels. It is automatically enabled on all Cisco SD-WAN tunnels and is responsible for detecting tunnel failures and performance degradation. BFD timers can be adjusted to tune the sensitivity of failure detection, but no explicit configuration is needed to enable BFD on the tunnels. This automation ensures consistent and efficient health monitoring across the SD-WAN network.
- A. Correct.
Correct. BFD sessions are automatically established for all tunnels in Cisco SD-WAN to monitor tunnel health, and the timers can be adjusted to suit network requirements.
- B. Incorrect.
Incorrect. BFD does not require explicit configuration for each tunnel in Cisco SD-WAN; it is enabled by default on all tunnels.
- C. Incorrect.
Incorrect. BFD in Cisco SD-WAN monitors data plane traffic and does not require separate configuration for control plane traffic.
- D. Incorrect.
Incorrect. BFD operates at the data plane level to monitor tunnel health, not at the application layer.