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300-410 Practice Question: Which TWO statements correctly describe the…
Which TWO statements correctly describe the behavior of OSPFv3 when troubleshooting neighbor adjacency issues on a Cisco IOS-XE router? (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
✓
OSPFv3 neighbor adjacencies are formed using the link-local IPv6 address of the neighbor.
OSPFv3 uses link-local addresses for neighbor adjacency formation and relies on IPv6 link-local addresses for next-hop resolution. The router ID is still a 32-bit value, and the network type must be configured under the interface. The 'ipv6 ospf' command is used to enable OSPFv3 on an interface, not 'ipv6 router ospf'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
OSPFv3 neighbor adjacencies are formed using the link-local IPv6 address of the neighbor.
Why this is correct
Correct. OSPFv3 uses IPv6 link-local addresses for neighbor discovery and adjacency formation, not global unicast addresses.
- ✗
The OSPFv3 router ID is a 128-bit value derived from the highest loopback IPv6 address.
Why it's wrong here
Incorrect. The OSPFv3 router ID is still a 32-bit value, just like OSPFv2, and is typically set manually or derived from an IPv4 address.
- ✗
The 'ipv6 router ospf' command is used to enable OSPFv3 on an interface.
Why it's wrong here
Incorrect. The 'ipv6 router ospf' command enters OSPFv3 router configuration mode; to enable OSPFv3 on an interface, use the 'ipv6 ospf <process-id> area <area-id>' command under the interface.
- ✓
The 'show ipv6 ospf neighbor' command displays the link-local address of each neighbor.
Why this is correct
Correct. The 'show ipv6 ospf neighbor' command output includes the neighbor's link-local IPv6 address in the 'Address' field.
- ✗
OSPFv3 uses the network type configured under the OSPFv3 process globally, not per interface.
Why it's wrong here
Incorrect. The network type (e.g., broadcast, point-to-point) is configured per interface using the 'ipv6 ospf network' command, not globally.
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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