CCNP Virtualization Practice Question
A network engineer is troubleshooting a Cisco SD-WAN deployment. The engineer notices that a branch site's vEdge router is not establishing control connections to the vSmart controller. The vEdge has the correct system IP and organization name. Which action should the engineer take first to verify connectivity?
⚠ Common exam trap
The trap here is focusing on vSmart or vManage configuration before verifying the initial vBond connection, which is the prerequisite for all other control connections.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the vEdge's configuration for the correct vBond IP address and ensure UDP port 12346 is open.
In Cisco SD-WAN, a vEdge router must first establish a control connection to the vBond orchestrator. This requires the vBond IP address to be configured and UDP port 12346 to be open. Once the vEdge authenticates with vBond, it receives the list of vSmart controllers and can then establish control connections to them. Therefore, the first troubleshooting step is to verify vBond reachability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Check the vEdge's configuration for the correct vBond IP address and ensure UDP port 12346 is open.
Why this is correct
The vEdge must first connect to the vBond orchestrator to learn about vSmart and vManage. The vBond IP address must be correctly configured, and UDP port 12346 must be open for the DTLS control connection. If the vEdge cannot reach vBond, it will not obtain the vSmart information and cannot establish control connections. This is the first step in troubleshooting.
- ✗
Ensure that the vEdge's WAN interface has a public IP address and can reach the internet.
Why it's wrong here
While internet reachability is necessary for the vEdge to reach vBond, the scenario already implies the vEdge has correct system IP and org name, but does not mention internet connectivity. However, checking vBond IP and port is more specific to the control connection process. Internet connectivity is a prerequisite, but the first step is to verify the vBond configuration and port.
- ✗
Verify that the vSmart controller has the correct certificate and is in the whitelist.
Why it's wrong here
While certificate and whitelist are important, they are not the first thing to check if the vEdge cannot establish control connections. The vEdge must first reach vBond to get the vSmart information. If vBond connectivity is broken, certificate issues are moot. The scenario indicates the vEdge has correct system IP and org name, so the next step is vBond reachability.
- ✗
Check the vManage GUI for the vEdge's serial number and ensure it is listed in the authorized devices.
Why it's wrong here
The vEdge's serial number must be authorized in vManage for it to be part of the overlay, but this is not the first step for control connection establishment. The vEdge first connects to vBond, then to vSmart. If the serial number is not authorized, the vEdge may not appear in vManage, but control connections to vSmart could still be attempted. The immediate issue is vBond reachability.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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