The answer is show ip eigrp neighbors and show ip eigrp interfaces. These two commands are correct because they directly verify the two critical aspects of EIGRP operation: neighbor adjacency formation and active interface participation. The show ip eigrp neighbors command displays all established adjacencies, including the neighbor’s IP address, hold time, and the local interface used, confirming that the neighbor relationship is up. The show ip eigrp interfaces command shows every interface on which EIGRP is enabled, along with the number of neighbors discovered on each, proving the interface is actively exchanging hello packets. On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to distinguish between commands that verify adjacency state versus those that show routing table entries or topology data—a common trap is choosing show ip route eigrp or show ip eigrp topology, which reveal routes, not neighbor health. A quick memory tip: think “Neighbors for who, Interfaces for where”—neighbors tells you who is connected, interfaces tells you where EIGRP is listening.
300-410 EIGRP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of eigrp troubleshooting. 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.
Which TWO commands would a network engineer use to verify that EIGRP is correctly forming neighbor adjacencies and exchanging routes on an interface? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
show ip eigrp neighbors
The 'show ip eigrp neighbors' command lists all established neighbors and their interface details, confirming adjacency. The 'show ip eigrp interfaces' command displays interfaces on which EIGRP is active and includes neighbor count, verifying that the interface is participating in EIGRP. The other commands either show routes (not neighbor state) or are not EIGRP-specific.
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.
✓
show ip eigrp neighbors
Why this is correct
This command directly lists all EIGRP neighbors, their interfaces, and hold time, confirming adjacency.
This displays only the EIGRP-learned routes in the routing table, not neighbor adjacency status.
✗
show ip protocols
Why it's wrong here
This shows EIGRP process configuration and summary, but does not confirm per-interface neighbor formation.
✗
show ip ospf neighbor
Why it's wrong here
This is an OSPF command, not applicable to EIGRP troubleshooting.
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.
Trap categories for this question
Command / output trap
This shows EIGRP process configuration and summary, but does not confirm per-interface neighbor formation.
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.
EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: show ip eigrp neighbors — The 'show ip eigrp neighbors' command lists all established neighbors and their interface details, confirming adjacency. The 'show ip eigrp interfaces' command displays interfaces on which EIGRP is active and includes neighbor count, verifying that the interface is participating in EIGRP. The other commands either show routes (not neighbor state) or are not EIGRP-specific.
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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