hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures an IPv6 manual tunnel…
An engineer configures an IPv6 manual tunnel between two routers. The tunnel is up and both routers can ping each other's tunnel IPv6 addresses. However, when the engineer tries to redistribute a connected IPv6 route from the tunnel into OSPFv3, the route is not advertised. The OSPFv3 process includes the tunnel interface. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the misconception that a tunnel being up and pingable implies a connected IPv6 route exists, but in manual tunnels, the tunnel interface must have its own IPv6 address for a connected route to be present and redistributable.
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
✓
The tunnel interface does not have an IPv6 address configured; manual tunnels require an IPv6 address on the tunnel interface for the connected route to exist.
For a manual IPv6 tunnel, the tunnel interface must have an IPv6 address configured. Without an IPv6 address on the tunnel interface, there is no connected IPv6 route for that interface, so the 'redistribute connected' command under OSPFv3 has no route to advertise. The tunnel being up and pingable between tunnel IPv6 addresses indicates the tunnel itself is operational, but the absence of an IPv6 address on the tunnel interface means no connected route exists to redistribute.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The tunnel interface does not have an IPv6 address configured; manual tunnels require an IPv6 address on the tunnel interface for the connected route to exist.
Why this is correct
Without an IPv6 address on the tunnel interface, there is no connected route to redistribute. The tunnel may still pass traffic using the tunnel source/destination, but no IPv6 subnet is directly connected.
- ✗
OSPFv3 does not support redistribution of connected routes from tunnel interfaces.
Why it's wrong here
OSPFv3 supports redistribution from any interface, including tunnels.
- ✗
The 'redistribute connected' command must include the 'metric-type' keyword to be effective.
Why it's wrong here
The metric-type is optional; redistribution still occurs without it.
- ✗
The tunnel interface is in a different OSPFv3 process than the one where redistribution is configured.
Why it's wrong here
If the tunnel interface is in the same OSPFv3 process, redistribution should work.
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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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 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 300-410 exam.