mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ipv6 route | include Tunnel
O 2001:DB8:1::/48 [110/2] via FE80::1, Tunnel0 O 2001:DB8:2::/48 [110/3] via FE80::2, Tunnel1
Based on this output, which statement is correct?
⚠ Common exam trap
Cisco often tests the distinction between OSPFv3 and OSPFv2 by using the route code 'O' in IPv6 routing tables, leading candidates to mistakenly think it could be EIGRP or that the transport must be IPv4, when in fact 'O' always means OSPF in any routing table context.
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
✓
OSPFv3 is running over the tunnel interfaces and these routes are reachable.
The output shows OSPF routes (indicated by 'O') learned over tunnel interfaces. Since the routes are IPv6 (2001:DB8::/48) and OSPFv3 is the IPv6-capable version of OSPF, the correct interpretation is that OSPFv3 is running over the tunnels. The 'via FE80::1, Tunnel0' confirms the next hop is a link-local address reachable through the tunnel, meaning the routes are reachable via OSPFv3 over those tunnels.
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 routes are learned via EIGRP.
Why it's wrong here
The 'O' indicates OSPF, not EIGRP.
- ✗
The tunnels are using IPv4 as the transport.
Why it's wrong here
The output does not indicate the transport protocol; it only shows IPv6 routing.
- ✓
OSPFv3 is running over the tunnel interfaces and these routes are reachable.
Why this is correct
The OSPF routes are present with next-hop addresses via tunnel interfaces.
- ✗
Tunnel0 has a higher metric than Tunnel1.
Why it's wrong here
Tunnel0 has metric 2, Tunnel1 has metric 3; Tunnel0 has lower metric.
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
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.