mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot an…
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?
⚠ Common exam trap
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.
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.
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.
- ✗
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.
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.
Go deeper
Related to this question
About these practice questions
One of 1,966 original 300-410 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.