200-301 Question 415
Select 3A network administrator is troubleshooting a connectivity issue between two branches of an organization. The branches are connected via a software-defined WAN (SD-WAN) solution. The administrator suspects a control plane issue. Which of the following could be a possible cause of the problem?
- A
Loss of connectivity between the branch edge router and the SD-WAN controller
- B
Misconfigured data plane policies on the edge routers
- C
Corrupted or outdated routing information in the SD-WAN control plane
- D
Insufficient bandwidth on the WAN link connecting the two branches
- E
The SD-WAN controller being unable to establish a secure tunnel with the branch edge router
Show answer and explanation
Correct answers: A, C, E
Explanation
The control plane in an SD-WAN solution is responsible for managing and distributing routing information, policies, and secure tunnels between the SD-WAN controller and edge devices. Issues such as loss of connectivity to the controller, corrupted routing data, or an inability to establish secure tunnels can disrupt the control plane and affect network connectivity. On the other hand, data plane issues like bandwidth limitations or data policy misconfigurations do not directly impact the control plane.
- A. Correct.
Loss of connectivity between the branch edge router and the SD-WAN controller can prevent the control plane from pushing updated policies or routing information to the edge router.
- B. Incorrect.
Data plane policies define how traffic is handled and forwarded, but they do not directly affect the control plane, making this unrelated to the suspected issue.
- C. Correct.
Corrupted or outdated routing information in the SD-WAN control plane can cause problems with how traffic paths are calculated and distributed to edge devices.
- D. Incorrect.
Insufficient bandwidth on the WAN link is a performance issue related to the data plane, not the control plane.
- E. Correct.
If the SD-WAN controller cannot establish a secure tunnel with the branch edge router, it cannot perform its functions, such as managing routing and policies, which are vital to the control plane.