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350-401 Practice Question: Which two statements about Cisco SD-WAN overlay…
Which two statements about Cisco SD-WAN overlay routing and OMP are true? (Choose two.)
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
✓
OMP (Overlay Management Protocol) is used to exchange routing, policy, and service information between vSmart controllers and vEdge routers.
Option A is correct because OMP (Overlay Management Protocol) is the control-plane protocol in Cisco SD-WAN that runs between vSmart controllers and vEdge/cEdge routers, carrying routing information (OMP routes), policy, and service-related data such as TLOCs and VPN membership. Option B is correct because OMP can advertise both IPv4 and IPv6 prefixes in the overlay, allowing the SD-WAN fabric to route IPv6 traffic natively alongside IPv4. Option C is incorrect because OMP does not run directly between vEdge routers; vEdge devices form data-plane IPsec tunnels between themselves, but OMP adjacencies are established only with vSmart controllers (and vBond for orchestration). Option D is incorrect because OMP routes are not automatically redistributed into BGP on vEdge routers; redistribution between OMP and BGP (or OSPF) must be explicitly configured via route policies. Option E is incorrect because OMP uses TCP port 12346 (not UDP) for control-plane communication between vSmart and vEdge devices.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
OMP (Overlay Management Protocol) is used to exchange routing, policy, and service information between vSmart controllers and vEdge routers.
Why this is correct
OMP runs only between vSmart controllers and vEdge/cEdge routers, carrying route prefixes, TLOC attributes, policies and service-side information in a single protocol. That combined routing, policy and service exchange is exactly what the stem's overlay routing statement requires.
- ✓
OMP supports both IPv4 and IPv6 prefix advertisements within the SD-WAN overlay.
Why this is correct
OMP carries IPv4 and IPv6 prefixes as distinct address families over the same DTLS or TLS control connections, so dual-stack sites advertise reachability without separate overlays. This satisfies the stem's requirement that OMP handle both protocols within the SD-WAN fabric, unlike TLOC-only or single-family routing advertisements.
- ✗
OMP runs directly between vEdge routers to establish a full mesh of routing adjacencies.
Why it's wrong here
OMP is not a peer-to-peer routing protocol between vEdge devices; it runs between each WAN Edge and the vSmart controllers, which redistribute routes. The full mesh of data-plane tunnels is built by TLOC/BFD, not OMP adjacencies. It is tempting because OMP does distribute routing information across the overlay, but via controllers, not direct device-to-device sessions.
- ✗
OMP routes are automatically redistributed into the local BGP process on the vEdge router.
Why it's wrong here
OMP routes are not automatically redistributed into BGP; redistribution must be configured explicitly, and OMP maintains its own routing table separate from BGP. It tempts engineers assuming seamless protocol interworking, which applies when explicit redistribution is configured between OMP and BGP.
- ✗
OMP uses UDP port 12346 for communication between vSmart and vEdge devices.
Why it's wrong here
OMP runs inside a DTLS or TLS tunnel, so its transport is not a bare UDP port; vSmart-to-vEdge control connections use DTLS 12346 or TLS 23456, making the statement incomplete. It tempts because 12346 is genuinely the DTLS port for OMP control connections, correct only when DTLS is the chosen transport.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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