- A
The neighbor is sending a partial update with five routes, which is typical for a triggered update after a topology change.
Why wrong: The update contains multiple routes, but the label 'update/interval' suggests it is a periodic update, not a triggered one.
- B
The neighbor is sending a full update, which occurs during initial neighbor formation or after a major change.
Why wrong: A full update would contain all routes, but the debug does not indicate it is a full update; 'update/interval' suggests periodic.
- C
The neighbor is sending a periodic update with five routes, which is normal EIGRP behavior.
EIGRP sends periodic updates (every 90 seconds by default) to maintain neighbor state, and this debug shows such an update.
- D
The neighbor is sending an update with incorrect metrics, causing routing issues.
Why wrong: The metrics appear consistent and there is no indication of error.
300-410 EIGRP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of eigrp troubleshooting. 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 update *Mar 1 00:10:15.456: EIGRP: received packet with opcode = 2 (Update) on GigabitEthernet0/0, src 10.1.2.2 dst 10.1.2.1 *Mar 1 00:10:15.456: EIGRP: Update contains 5 routes, version 145, seq 10 *Mar 1 00:10:15.456: EIGRP: Update update/interval, 10.1.1.0/24 metric 131072 *Mar 1 00:10:15.456: EIGRP: Update update/interval, 10.2.2.0/24 metric 131072 *Mar 1 00:10:15.456: EIGRP: Update update/interval, 10.3.3.0/24 metric 131072 *Mar 1 00:10:15.456: EIGRP: Update update/interval, 10.4.4.0/24 metric 131072 *Mar 1 00:10:15.456: EIGRP: Update update/interval, 10.5.5.0/24 metric 131072
What does this output indicate?
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
The neighbor is sending a periodic update with five routes, which is normal EIGRP behavior.
The debug shows an EIGRP Update packet received from 10.1.2.2 containing five routes. This is a normal update, likely sent as a periodic or triggered update. The 'update/interval' indicates the update is being sent due to the periodic update timer.
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.
- ✗
The neighbor is sending a partial update with five routes, which is typical for a triggered update after a topology change.
Why it's wrong here
The update contains multiple routes, but the label 'update/interval' suggests it is a periodic update, not a triggered one.
- ✗
The neighbor is sending a full update, which occurs during initial neighbor formation or after a major change.
Why it's wrong here
A full update would contain all routes, but the debug does not indicate it is a full update; 'update/interval' suggests periodic.
- ✓
The neighbor is sending a periodic update with five routes, which is normal EIGRP behavior.
- ✗
The neighbor is sending an update with incorrect metrics, causing routing issues.
Why it's wrong here
The metrics appear consistent and there is no indication of error.
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.
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.
What to study next
Got this wrong? Here's your next step.
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.
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FAQ
Questions learners often ask
What does this 300-410 question test?
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: The neighbor is sending a periodic update with five routes, which is normal EIGRP behavior. — The debug shows an EIGRP Update packet received from 10.1.2.2 containing five routes. This is a normal update, likely sent as a periodic or triggered update. The 'update/interval' indicates the update is being sent due to the periodic update timer.
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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Last reviewed: Jun 18, 2026
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