300-415 · Question #266
Which protocol detects path status (up/down), measures loss/latency/jitter, and measures the quality of the IPsec tunnel MTU?
The correct answer is B. BFD. Bidirectional Forwarding Detection (BFD) is the protocol used in Cisco SD-WAN to actively monitor the status, quality metrics (loss, latency, jitter), and MTU of data plane tunnels, including IPsec tunnels.
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Options
- ADTLS
- BBFD
- COMP
- DIP-SLA
How the community answered
(38 responses)- A5% (2)
- B89% (34)
- C3% (1)
- D3% (1)
Why each option
Bidirectional Forwarding Detection (BFD) is the protocol used in Cisco SD-WAN to actively monitor the status, quality metrics (loss, latency, jitter), and MTU of data plane tunnels, including IPsec tunnels.
DTLS (Datagram Transport Layer Security) is used for control plane connections in Cisco SD-WAN to secure communication between control plane elements and WAN Edge devices, not for data plane path monitoring.
BFD (Bidirectional Forwarding Detection) is a lightweight protocol that quickly detects link failures and measures key performance indicators like loss, latency, and jitter, as well as the path MTU, for data plane tunnels in Cisco SD-WAN. It is essential for ensuring the health and quality of service for overlay tunnels.
Concept tested: BFD for SD-WAN tunnel monitoring and quality
Source: https://www.cisco.com/c/en/us/td/docs/sdwan/sd-wan-release-20-x/configuration-guide/sdwan-monitor-cg/sdwan-monitor-cg_chapter_011.html
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