The correct interpretation is that this OSPFv3 Router LSA from advertising router 2.2.2.2 indicates a single transit link using interface IDs, which is standard for OSPFv3. Unlike OSPFv2, which uses IP addresses in the link data field, OSPFv3 relies on interface IDs to identify neighbors on point-to-point and transit links, as shown here with a Neighbor Interface ID of 1 and a local Interface ID of 2, both with a metric of 10. On the Cisco CCNP ENARSI 300-410 exam, this tests your ability to distinguish OSPFv3’s link-type encoding from OSPFv2’s, a common trap where candidates mistakenly expect IPv6 addresses in the Router LSA output. Remember that OSPFv3 Router LSAs never contain IP addresses—they only carry interface IDs and the router’s own RID. A useful memory tip: “OSPFv3 Router LSAs use IDs, not IPs—think ‘Interface ID, not Address ID’ to avoid the trap.”
300-410 OSPF Troubleshooting (v2/v3) Practice Question
This 300-410 practice question tests your understanding of ospf troubleshooting (v2/v3). Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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
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.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 link is to a transit network, not a stub network.
✓
The LSA indicates a single transit link with interface IDs, typical for OSPFv3.
Why this is correct
OSPFv3 uses interface IDs to identify links, and this LSA shows one transit link.
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
OSPF Troubleshooting (v2/v3) — This question tests OSPF Troubleshooting (v2/v3) — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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