- A
show ip eigrp neighbors
This command directly lists all EIGRP neighbors, their interfaces, and hold time, confirming adjacency.
- B
show ip eigrp interfaces
This command shows interfaces with EIGRP enabled and the number of neighbors on each, verifying EIGRP activity.
- C
show ip route eigrp
Why wrong: This displays only the EIGRP-learned routes in the routing table, not neighbor adjacency status.
- D
show ip protocols
Why wrong: This shows EIGRP process configuration and summary, but does not confirm per-interface neighbor formation.
- E
show ip ospf neighbor
Why wrong: This is an OSPF command, not applicable to EIGRP troubleshooting.
Question 409 of 2,152
Essential Commands for Verifying EIGRP Neighbor Adjacencies
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.)
Quick Answer
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.
Answer choices
Why each option matters
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 displays the EIGRP neighbor table, which confirms that neighbor adjacencies have been successfully formed. The 'show ip eigrp interfaces' command shows which interfaces are enabled for EIGRP, including the number of peers (neighbors) on each interface, which verifies that the interface is actively participating in EIGRP and exchanging routes.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
show ip eigrp interfaces
Why this is correct
This command shows interfaces with EIGRP enabled and the number of neighbors on each, verifying EIGRP activity.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
show ip route eigrp
Why it's wrong here
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
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between commands that verify the adjacency formation process (neighbor table and interface status) versus commands that show the result of that process (routing table), leading candidates to incorrectly choose 'show ip route eigrp'.
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
EIGRP uses Reliable Transport Protocol (RTP) for neighbor discovery and route exchange, and the neighbor table is built after receiving Hello packets. The 'show ip eigrp interfaces' command also reveals the 'Peers' count, which directly indicates how many neighbors are adjacent on that interface, and the 'Pending Routes' field can show if route exchange is incomplete. In a real-world scenario, if an interface shows zero peers but is expected to have neighbors, it points to a Layer 2 or authentication mismatch issue.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: show ip eigrp neighbors — The 'show ip eigrp neighbors' command displays the EIGRP neighbor table, which confirms that neighbor adjacencies have been successfully formed. The 'show ip eigrp interfaces' command shows which interfaces are enabled for EIGRP, including the number of peers (neighbors) on each interface, which verifies that the interface is actively participating in EIGRP and exchanging routes.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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