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.
300-410 Device Management Practice Question
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
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 debug output shows normal EIGRP hello and update packet exchange between neighbors. The sequence numbers increment properly, indicating adjacency is established and routes are being exchanged without errors.
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 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.
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
No authentication errors are shown in the output.
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.
Device Management — This question tests Device Management — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: EIGRP adjacency is forming and routes are being exchanged successfully. — The debug output shows normal EIGRP hello and update packet exchange between neighbors. The sequence numbers increment properly, indicating adjacency is established and routes are being exchanged without errors.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.