hardMultiple Choice
300-410 Practice Question: Runs the following command to verify OSPFv3…
A network engineer runs the following command to verify OSPFv3 database:
R1# show ipv6 ospf database router 2.2.2.2
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
LS age: 60 LS Type: Router Links Link State ID: 0.0.0.0 Advertising Router: 2.2.2.2 LS Seq Number: 80000003 Checksum: 0x5678 Length: 40 Number of Links: 1
Link connected to: a Transit Network (Link ID) Interface ID: 2 (Link Data) Neighbor Interface ID: 1 Number of TOS metrics: 0 TOS 0 Metrics: 10
What does this output indicate?
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 LSA indicates a single transit link with interface IDs, typical for OSPFv3.
The output shows an OSPFv3 Router LSA from router 2.2.2.2 with one link to a transit network, using interface IDs instead of IP addresses.
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 LSA shows a link to a stub network with prefix information.
Why it's wrong here
The output states the link is connected to a Transit Network, identified by Interface ID and Neighbor Interface ID, not a stub network. Stub links instead carry IPv6 prefix information in the LSA. It tempts because stub links are the other common Router-LSA link type, so candidates who misread the link description pick it.
- ✓
The LSA indicates a single transit link with interface IDs, typical for OSPFv3.
Why this is correct
The Router-LSA lists one link of type Transit Network, carrying the interface ID and neighbour interface ID rather than IPv4 addresses. OSPFv3 identifies links by interface ID, so this is normal output for a broadcast segment with a single adjacency.
- ✗
The advertising router is 1.1.1.1.
Why it's wrong here
The Advertising Router field reads 2.2.2.2; 1.1.1.1 is the local router ID shown in the header. It tempts because the header line names the local router, so candidates confuse the querying device with the LSA originator. Advertising Router identifies which router generated the LSA.
- ✗
This is a Type 5 External LSA.
Why it's wrong here
The output shows LS Type: Router Links, which is Type 1, not Type 5. Type 5 External LSAs advertise redistributed routes from outside the OSPF domain and appear under AS External Link States. It tempts because external LSAs are also inspected with the database command.
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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