- A
EIGRP adjacency is forming and routes are being exchanged successfully.
The debug shows HELLO and UPDATE packets with proper sequence numbers, confirming adjacency and route exchange.
- B
EIGRP adjacency is stuck in INIT state because no hello packets are received.
Why wrong: Hello packets are received, so adjacency is not stuck in INIT.
- C
EIGRP is experiencing authentication failures.
Why wrong: No authentication errors are shown in the output.
- D
EIGRP is only sending hellos but not receiving updates.
Why wrong: Updates are received, as shown by the 'Received UPDATE' line.
Question 1,686 of 2,152
What Does 'debug eigrp packets' Show?
This 300-410 practice question tests your understanding of device management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 troubleshoot an EIGRP issue:
R1# debug eigrp packets
EIGRP: Received HELLO on GigabitEthernet0/0 nbr 10.1.1.2 AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 EIGRP: Sending HELLO on GigabitEthernet0/0 AS 100, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0 EIGRP: Received UPDATE on GigabitEthernet0/0 nbr 10.1.1.2 AS 100, Flags 0x1, Seq 1/0 idbQ 0/0 iidbQ un/rely 0/0 EIGRP: Sending UPDATE on GigabitEthernet0/0 nbr 10.1.1.2 AS 100, Flags 0x1, Seq 2/1 idbQ 0/0 iidbQ un/rely 0/0
What does this output indicate?
Quick Answer
The answer is that the debug eigrp packets output indicates a normal and healthy EIGRP adjacency formation with successful route exchange. This is correct because the output shows both received and sent HELLO packets on GigabitEthernet0/0 with matching AS 100, confirming neighbor discovery, followed by UPDATE packets with incrementing sequence numbers (Seq 1/0 and Seq 2/1), which demonstrates reliable transport and proper route advertisement without errors or retransmissions. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to distinguish normal EIGRP operation from problematic patterns like stuck-in-active or neighbor flapping; a common trap is misinterpreting the Flags 0x1 in the UPDATE as an error, when it actually indicates the initial or reliable packet. A useful memory tip is to think of the sequence numbers as a handshake: if they increment smoothly, the adjacency is healthy, but if you see repeated retransmissions or zero sequence numbers, suspect a problem.
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
✓
EIGRP adjacency is forming and routes are being exchanged successfully.
The output shows both incoming and outgoing Hello packets, confirming that the EIGRP adjacency is established and both routers are in the Init state or beyond. The subsequent UPDATE packets with sequence numbers (Seq 1/0 and Seq 2/1) indicate that routes are being exchanged successfully, which is the normal behavior for a forming or stable EIGRP neighbor relationship.
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.
- ✓
EIGRP adjacency is forming and routes are being exchanged successfully.
Why this is correct
The debug shows HELLO and UPDATE packets with proper sequence numbers, confirming adjacency and route exchange.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
EIGRP adjacency is stuck in INIT state because no hello packets are received.
Why it's wrong here
Hello packets are received, so adjacency is not stuck in INIT.
- ✗
EIGRP is experiencing authentication failures.
Why it's wrong here
No authentication errors are shown in the output.
- ✗
EIGRP is only sending hellos but not receiving updates.
Why it's wrong here
Updates are received, as shown by the 'Received UPDATE' line.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misinterpretation of debug output where candidates assume that seeing only Hello packets means no adjacency, but the presence of UPDATE packets with sequence numbers is the key indicator of a fully formed neighbor relationship and route exchange.
Trap categories for this question
Command / output trap
No authentication errors are shown in the output.
Detailed technical explanation
How to think about this question
EIGRP uses Reliable Transport Protocol (RTP) for UPDATE packets, which require acknowledgment (ACK). The sequence numbers in the debug output (e.g., Seq 1/0 and Seq 2/1) track the reliable delivery: the first number is the packet's sequence number, and the second is the sequence number being acknowledged. In this case, the neighbor is acknowledging received updates, confirming a fully operational adjacency with bidirectional route exchange.
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?
Device Management — This question tests Device Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: EIGRP adjacency is forming and routes are being exchanged successfully. — The output shows both incoming and outgoing Hello packets, confirming that the EIGRP adjacency is established and both routers are in the Init state or beyond. The subsequent UPDATE packets with sequence numbers (Seq 1/0 and Seq 2/1) indicate that routes are being exchanged successfully, which is the normal behavior for a forming or stable EIGRP neighbor relationship.
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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