- A
Data plane traffic between vEdge routers is encrypted using IPsec tunnels.
Correct because IPsec is used to encrypt all data traffic traversing the overlay tunnels between WAN Edge routers.
- B
Control plane traffic between vSmart and vEdge routers is secured using DTLS or TLS.
Correct because control plane communication is encrypted with DTLS (default) or TLS to protect OMP and other signaling.
- C
VPN segmentation in SD-WAN allows traffic from different tenants or departments to be isolated using separate VRFs on the vEdge routers.
Correct because VPNs (similar to VRFs) provide Layer 3 isolation; each VPN has its own routing table and forwarding instance on the vEdge.
- D
Data plane encryption is performed between vSmart controllers and vEdge routers to protect OMP updates.
Why wrong: Incorrect because data plane encryption applies to traffic between vEdge routers, not between vSmart and vEdge; control plane encryption already protects OMP.
- E
VPN segmentation is configured on the vSmart controller and pushed to vEdge routers via OMP.
Why wrong: Incorrect because VPN segmentation is configured locally on the vEdge routers; vSmart distributes policy and routes but does not define VPNs.
CCNP SD-WAN Architecture Practice Question
This 350-401 practice question tests your understanding of sd-wan architecture. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which three statements about Cisco SD-WAN security and segmentation are true? (Choose three.)
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
Data plane traffic between vEdge routers is encrypted using IPsec tunnels.
Cisco SD-WAN uses IPsec for data plane encryption and supports multiple VPN segments (VRFs) for traffic isolation. Control plane encryption is also provided using DTLS or TLS. The data plane encryption is between vEdge routers, not between vSmart and vEdge. VPN segmentation is configured on vEdge routers, not on vSmart. The vBond orchestrator does not participate in data plane encryption.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Data plane traffic between vEdge routers is encrypted using IPsec tunnels.
- ✓
Control plane traffic between vSmart and vEdge routers is secured using DTLS or TLS.
- ✓
VPN segmentation in SD-WAN allows traffic from different tenants or departments to be isolated using separate VRFs on the vEdge routers.
- ✗
Data plane encryption is performed between vSmart controllers and vEdge routers to protect OMP updates.
Why it's wrong here
Incorrect because data plane encryption applies to traffic between vEdge routers, not between vSmart and vEdge; control plane encryption already protects OMP.
- ✗
VPN segmentation is configured on the vSmart controller and pushed to vEdge routers via OMP.
Why it's wrong here
Incorrect because VPN segmentation is configured locally on the vEdge routers; vSmart distributes policy and routes but does not define VPNs.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 350-401 question test?
SD-WAN Architecture — This question tests SD-WAN Architecture — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Data plane traffic between vEdge routers is encrypted using IPsec tunnels. — Cisco SD-WAN uses IPsec for data plane encryption and supports multiple VPN segments (VRFs) for traffic isolation. Control plane encryption is also provided using DTLS or TLS. The data plane encryption is between vEdge routers, not between vSmart and vEdge. VPN segmentation is configured on vEdge routers, not on vSmart. The vBond orchestrator does not participate in data plane encryption.
What should I do if I get this 350-401 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
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Last reviewed: Jun 18, 2026
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.
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