The answer is that the router 2.2.2.2 is connected to the Designated Router at 10.0.0.1 over the DMVPN tunnel with a cost of 10. This is correct because the OSPF router LSA shows a single link of type "Transit Network," where the Link ID is the DR's interface address (10.0.0.1) and the Link Data is the advertising router's own interface address (10.0.0.2). In a DMVPN topology, the hub typically becomes the DR on the NBMA network, and each spoke advertises a single transit link back to that hub, as seen here with only one link listed and a metric of 10. On the Cisco CCNP ENARSI 300-410 exam, this output tests your ability to interpret OSPF LSAs in non-broadcast multi-access environments, where a common trap is assuming multiple links or a point-to-point type. A key memory tip is "one spoke, one link, one DR"—if a router LSA shows only one transit link, the router is a spoke connected to the hub acting as the DR.
300-410 DMVPN Practice Question
This 300-410 practice question tests your understanding of dmvpn. 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 OSPF database on a DMVPN hub:
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: 100
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: 80000001
Checksum: 0x1234
Length: 48
Number of Links: 1
Link connected to: a Transit Network
(Link ID) Designated Router address: 10.0.0.1
(Link Data) Router Interface address: 10.0.0.2
Number of MTID 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 router 2.2.2.2 is connected to the DR at 10.0.0.1 over the DMVPN tunnel with cost 10.
The output shows the router LSA from 2.2.2.2, advertising a link to a transit network (the DMVPN tunnel) with metric 10, indicating the spoke is connected to the hub's DR.
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 router 2.2.2.2 is advertising a stub network via Tunnel0.
Why it's wrong here
Incorrect because the link type is 'Transit Network', not stub.
✓
The router 2.2.2.2 is connected to the DR at 10.0.0.1 over the DMVPN tunnel with cost 10.
Why this is correct
Correct: The LSA shows a transit link to DR 10.0.0.1 with metric 10.
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.
DMVPN — This question tests DMVPN — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The router 2.2.2.2 is connected to the DR at 10.0.0.1 over the DMVPN tunnel with cost 10. — The output shows the router LSA from 2.2.2.2, advertising a link to a transit network (the DMVPN tunnel) with metric 10, indicating the spoke is connected to the hub's DR.
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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