Cisco
300-415 · Question #335
300-415 Question #335: Real Exam Question with Answer & Explanation
The correct answer is B: They continue operating normally for a configurable time.. WAN Edge devices continue to operate normally for a configurable period, forwarding data plane traffic based on their last known policies, even if the vSmart controller becomes inaccessible.
Architecture
Question
How do WAN Edge devices operate when vSmart is inaccessible or fails to be reached by the WAN Edge?
Options
- AThey continue operation normally.
- BThey continue operating normally for a configurable time.
- CThey continue to receive reachability updates.
- DThey cease to forward traffic in the data plane.
Explanation
WAN Edge devices continue to operate normally for a configurable period, forwarding data plane traffic based on their last known policies, even if the vSmart controller becomes inaccessible.
Common mistakes.
- A. They do not continue 'normally' indefinitely; there is a time limit before operations are impacted, specifically if new policy or routing updates are required.
- C. WAN Edge devices cannot receive reachability updates from vSmart if vSmart is inaccessible.
- D. WAN Edge devices do not immediately cease forwarding data plane traffic; they maintain their current state and forward traffic for a grace period.
Concept tested. Cisco SD-WAN vSmart controller failure impact
Topics
#SD-WAN Architecture#Controller Failure#WAN Edge Operation#Control Plane Resilience
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