300-415 Question 127
Select 2A company is deploying Cisco SD-WAN and requires dynamic tunnels between branch offices to optimize application performance and reduce latency. Which conditions must be met for dynamic tunnels to be established between branch sites?
- A
The branch devices must have active TLOC routes advertised by the vSmart controller.
- B
The branch devices must use OSPF to exchange routing information directly.
- C
The devices at both branches must have the same color for their TLOCs.
- D
IPSec must be enabled and configured for the WAN transport interfaces.
- E
The vSmart controller must explicitly configure static tunnels between the branch devices.
Show answer and explanation
Correct answers: A, D
Explanation
Dynamic tunnels in Cisco SD-WAN are automatically established between branch sites to optimize performance. For this to occur, branch devices must have active TLOC routes advertised by the vSmart controller, allowing them to learn about each other's reachability. Additionally, IPSec must be enabled to secure the dynamic tunnels. Static tunnel configuration is not required, and TLOC colors do not need to match between branches.
- A. Correct.
Correct: Active TLOC routes advertised by the vSmart controller are required for branches to learn about each other's reachability and build dynamic tunnels.
- B. Incorrect.
Incorrect: While OSPF can be used within a site for routing, it is not required for dynamic tunnels in Cisco SD-WAN as the vSmart controller handles route advertisement.
- C. Incorrect.
Incorrect: TLOC colors do not need to match between branches for dynamic tunnels to be established. They are used to identify transport types, not to enforce connectivity.
- D. Correct.
Correct: IPSec is required to secure the dynamic tunnels that are established between branch sites in Cisco SD-WAN.
- E. Incorrect.
Incorrect: Dynamic tunnels are established automatically by the SD-WAN fabric and do not require static configuration by the vSmart controller.