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Exam 300-420 topic 1 question 63 discussion

Actual exam question from Cisco's 300-420
Question #: 63
Topic #: 1
[All 300-420 Questions]

How is a sub-second failure of a transport link detected in a Cisco SD-WAN network?

  • A. Hellos are sent between the WAN Edge routers and the vSmart controller.
  • B. BFD runs on the IPsec tunnels between WAN Edge routers.
  • C. BGP is used between WAN Edge routers and the vSmart controller.
  • D. Link state change messages are sent between vSmart controllers.
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Suggested Answer: B 🗳️
by XalaGyan at March 29, 2022, 2:02 p.m.

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XalaGyan
7 months, 3 weeks ago
Selected Answer: B
Provided answer is correct https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/Monitor-And-Maintain/monitor-maintain-book/m-network.html BFD Protocol The Role of BFD in Cisco SD-WAN Solution The BFD protocol detects links failures between routers. It measures data loss and latency on the data tunnel to determine the status of the devices at either end of the connection. For data plane resiliency, the Cisco SD-WAN software implements the BFD protocol, which runs automatically on the secure IPsec and GRE connections between routers. These connections are used for the data plane, and for data traffic, and are independent of the DTLS tunnels used by the control plane.
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