hardMultiple SelectObjective-mapped
CCNP Practice Question: Which three statements about SD-WAN overlay…
Which three statements about SD-WAN overlay tunnels and transport 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
✓
Control plane communication between vSmart and edge devices uses DTLS or TLS encryption.
SD-WAN uses DTLS or TLS for secure control plane tunnels, and IPsec for data plane tunnels. Each edge device builds multiple IPsec tunnels to other edge devices based on TLOC mapping. The transport can be any combination of MPLS, Internet, or LTE. TLOC uniquely identifies a WAN attachment point. OMP manages route distribution, not tunnel establishment.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Control plane communication between vSmart and edge devices uses DTLS or TLS encryption.
Why this is correct
Correct because the control plane (vSmart to edge) uses DTLS by default, with TLS as an option.
- ✓
Data plane tunnels between edge devices are encrypted using IPsec with IKEv2 key exchange.
Why this is correct
Correct because IPsec is used for secure data plane tunnels between vEdge/cEdge routers.
- ✓
A TLOC (Transport Location) is defined by the combination of system IP, color, and encapsulation type.
Why this is correct
Correct because TLOC is uniquely identified by the system IP, color, and encapsulation (IPsec/GRE).
- ✗
SD-WAN edge devices can only use MPLS or Internet as transport; LTE is not supported.
Why it's wrong here
Incorrect because LTE is supported as a transport type in addition to MPLS and Internet.
- ✗
OMP is responsible for dynamically establishing IPsec tunnels between edge devices based on policy.
Why it's wrong here
Incorrect because OMP distributes routes and policies; IPsec tunnels are built based on TLOC reachability, not directly by OMP.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.