The correct answer is that EIGRP hellos are suppressed on all interfaces except GigabitEthernet0/0. This occurs because the passive-interface default command globally sets every interface on the router to a passive state, which prevents the sending and receiving of EIGRP hello packets, thereby blocking neighbor adjacency formation. The subsequent no passive-interface GigabitEthernet0/0 command explicitly overrides that default for only that specific interface, restoring its ability to exchange hellos and form adjacencies. On the ENCOR 350-401 exam, this configuration tests your understanding of how the passive-interface default command interacts with per-interface overrides—a common trap is assuming the default keyword only affects interfaces not explicitly configured with a network statement. Remember the memory tip: "Default makes all quiet; no passive lets one speak."
CCNP Cisco DNA Center Practice Question
This 350-401 practice question tests your understanding of cisco dna center. 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.
Consider the following configuration snippet from a Cisco IOS-XE router:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
EIGRP hellos are suppressed on all interfaces except GigabitEthernet0/0.
The command 'passive-interface default' makes all interfaces passive by default, meaning they will not send or receive EIGRP hellos. The subsequent 'no passive-interface GigabitEthernet0/0' overrides this for that specific interface, allowing EIGRP adjacency formation on it.
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.
✓
EIGRP hellos are suppressed on all interfaces except GigabitEthernet0/0.
Why this is correct
The default passive suppresses hellos on all interfaces, and the no passive allows them on G0/0.
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.
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.
What to study next
Got this wrong? Here's your next step.
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 350-401 OSPF questions on adjacency and route selection.
Cisco DNA Center — This question tests Cisco DNA Center — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: EIGRP hellos are suppressed on all interfaces except GigabitEthernet0/0. — The command 'passive-interface default' makes all interfaces passive by default, meaning they will not send or receive EIGRP hellos. The subsequent 'no passive-interface GigabitEthernet0/0' overrides this for that specific interface, allowing EIGRP adjacency formation on it.
What should I do if I get this 350-401 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 350-401 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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Question Discussion
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