The answer is that all interfaces except GigabitEthernet0/0 will be passive, meaning only GigabitEthernet0/0 will send and receive OSPF hellos. This is because the passive-interface default command globally sets every interface on the router to a passive state, preventing them from sending hello packets or forming neighbor adjacencies. The subsequent no passive-interface GigabitEthernet0/0 command explicitly overrides that default for that specific interface, restoring its ability to establish OSPF adjacencies. On the Cisco CCNP ENARSI 300-410 exam, this configuration tests your understanding of the order of operations in OSPF interface control, often appearing in troubleshooting scenarios where a router is unexpectedly not forming neighbors. A common trap is assuming passive-interface default alone stops all OSPF traffic, but it does not affect the router’s own loopback or management interfaces unless they are explicitly matched by a network statement. Remember the memory tip: “Default makes all quiet; no passive lets one shout.”
300-410 OSPF Troubleshooting (v2/v3) Practice Question
This 300-410 practice question tests your understanding of ospf troubleshooting (v2/v3). This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Examine this OSPF configuration on router R5:
router ospf 1
network 10.0.0.0 0.255.255.255 area 0
passive-interface default
no passive-interface GigabitEthernet0/0
What is the effect of the passive-interface default command?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
All interfaces except GigabitEthernet0/0 will be passive; GigabitEthernet0/0 will send and receive OSPF hellos.
The passive-interface default command sets all interfaces as passive by default, meaning they will not send OSPF hello packets or form adjacencies. The no passive-interface command then overrides this for the specified interface, allowing it to form adjacencies.
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.
✓
All interfaces except GigabitEthernet0/0 will be passive; GigabitEthernet0/0 will send and receive OSPF hellos.
Why this is correct
Correct. The default passive is overridden for GigabitEthernet0/0.
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.
Trap categories for this question
Command / output trap
Incorrect. The no passive-interface command takes precedence.
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: All interfaces except GigabitEthernet0/0 will be passive; GigabitEthernet0/0 will send and receive OSPF hellos. — The passive-interface default command sets all interfaces as passive by default, meaning they will not send OSPF hello packets or form adjacencies. The no passive-interface command then overrides this for the specified interface, allowing it to form adjacencies.
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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