The answer is that Router 2.2.2.2 has a link to a transit network with DR address 10.1.1.2 and a stub network 192.168.1.0/24. This is correct because the show ip ospf database router command displays the router LSA (Type 1) from the advertising router, listing each of its directly connected links along with their type, metric, and associated interface or subnet information. In this output, the two links are explicitly described: one connected to a transit network (identifying the DR at 10.1.1.2) and one connected to a stub network (192.168.1.0/24). On the Cisco CCNP ENARSI 300-410 exam, interpreting the OSPF router LSA database command tests your ability to read the link-state database and understand how OSPF builds its topology, often requiring you to distinguish between transit, stub, and point-to-point link types. A common trap is confusing the Link State ID (2.2.2.2) with a network LSA—remember that a router LSA always uses the advertising router’s RID as the Link State ID. Memory tip: “Router LSA = My Links, My RID” — the Type 1 LSA only describes the originating router’s own interfaces.
300-410 OSPF Troubleshooting (v2/v3) Practice Question
This 300-410 practice question tests your understanding of ospf troubleshooting (v2/v3). The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 troubleshoot OSPF route propagation:
R1# show ip ospf database router 2.2.2.2
OSPF Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
LS age: 45
Options: (No TOS-capability, DC)
LS Type: Router Links
Link State ID: 2.2.2.2
Advertising Router: 2.2.2.2
LS Seq Number: 80000005
Checksum: 0x1234
Length: 48
Number of Links: 2
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.1.1.2
(Link Data) Router Interface address: 10.1.1.2
Number of TOS metrics: 0
TOS 0 Metrics: 10
Link connected to: a Stub Network
(Link ID) Network/subnet number: 192.168.1.0
(Link Data) Network Mask: 255.255.255.0
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
✓
Router 2.2.2.2 has a link to a transit network with DR address 10.1.1.2 and a stub network 192.168.1.0/24.
The output shows the router LSA from neighbor 2.2.2.2, listing its connected links including a transit network and a stub network.
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.
✗
Router 2.2.2.2 is advertising two stub networks.
Why it's wrong here
One link is a transit network (to a DR), the other is a stub network.
✓
Router 2.2.2.2 has a link to a transit network with DR address 10.1.1.2 and a stub network 192.168.1.0/24.
Why this is correct
The LSA shows exactly these two links with their types and metrics.
The output shows the network LSA for the transit network.
Why it's wrong here
The LS Type is Router Links, indicating a Router LSA.
Common exam traps
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: Router 2.2.2.2 has a link to a transit network with DR address 10.1.1.2 and a stub network 192.168.1.0/24. — The output shows the router LSA from neighbor 2.2.2.2, listing its connected links including a transit network and a stub network.
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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