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300-410 Practice Question: In OSPFv3, what is the purpose of the link-local…
In OSPFv3, what is the purpose of the link-local address in the neighbor adjacency process?
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 link-local address is used as the source address for OSPFv3 packets and for next-hop resolution.
OSPFv3 uses link-local addresses for neighbor discovery and as the source address for OSPF packets. This is a change from OSPFv2, which uses the interface's IPv4 address. The link-local address is used for next-hop resolution and adjacency formation.
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 link-local address is used as the router ID for OSPFv3.
Why it's wrong here
Incorrect. The router ID is a separate 32-bit value, not derived from the link-local address.
- ✓
The link-local address is used as the source address for OSPFv3 packets and for next-hop resolution.
Why this is correct
Correct. OSPFv3 packets are sourced from the link-local address, and next hops are link-local addresses.
- ✗
The link-local address is only used for DR/BDR election.
Why it's wrong here
Incorrect. DR/BDR election uses the router ID, not the link-local address.
- ✗
The link-local address is not used in OSPFv3; global unicast addresses are used instead.
Why it's wrong here
Incorrect. OSPFv3 relies on link-local addresses for its operation.
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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Last reviewed: Jun 18, 2026
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