The answer is that EIGRP will send hello packets every 15 seconds and wait 45 seconds before declaring a neighbor down on that interface. This is correct because the `ip hello-interval eigrp 100 15` command overrides the default hello timer (typically 5 or 60 seconds depending on bandwidth), while `ip hold-time eigrp 100 45` sets the hold timer to 45 seconds for autonomous system 100. On the Cisco CCNP ENARSI 300-410 exam, this configuration tests your understanding that the hold time is not automatically adjusted when you change the hello interval—it must be set explicitly, or it remains at its default value. A common trap is assuming the hold time scales proportionally; here, it is manually set to three times the hello interval, but that ratio is not enforced by the router. For the exam, remember the memory tip: “Hello sets the beat, hold sets the wait—change one, check the other.”
300-410 EIGRP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of eigrp troubleshooting. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Examine the following EIGRP configuration on Router R6:
interface GigabitEthernet0/2
ip hello-interval eigrp 100 15
ip hold-time eigrp 100 45
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
EIGRP will send hello packets every 15 seconds and wait 45 seconds before declaring a neighbor down.
These commands change the EIGRP hello interval to 15 seconds and hold time to 45 seconds on the interface for AS 100. The hold time is three times the hello interval by default, but here it is explicitly set.
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 will send hello packets every 15 seconds and wait 45 seconds before declaring a neighbor down.
Why this is correct
The hello interval is set to 15 seconds, and hold time to 45 seconds.
EIGRP will send hello packets every 45 seconds and wait 15 seconds.
Why it's wrong here
The hello interval is 15 seconds, not 45.
✗
EIGRP will use the default hello interval of 5 seconds and hold time of 15 seconds.
Why it's wrong here
Explicit configuration overrides defaults.
✗
EIGRP will not form neighbor adjacencies because the hold time is not a multiple of the hello interval.
Why it's wrong here
There is no such requirement; hold time can be any value.
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.
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.
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: EIGRP will send hello packets every 15 seconds and wait 45 seconds before declaring a neighbor down. — These commands change the EIGRP hello interval to 15 seconds and hold time to 45 seconds on the interface for AS 100. The hold time is three times the hello interval by default, but here it is explicitly set.
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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