Question 1,045 of 2,152

EIGRP Troubleshooting →hardMultiple ChoiceObjective-mapped

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# show ip eigrp topology all-links

IP-EIGRP Topology Table for AS 100

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - Reply status, s - sia Status

P 10.1.1.0/24, 1 successors, FD is 131072 via 10.1.2.2 (131072/130816), GigabitEthernet0/0 via 10.1.3.3 (131328/131072), GigabitEthernet0/1 P 10.2.2.0/24, 1 successors, FD is 131072 via 10.1.2.2 (131072/130816), GigabitEthernet0/0 A 10.3.3.0/24, 0 successors, FD is Infinity via 10.1.2.2 (4294967295/4294967295), GigabitEthernet0/0 via 10.1.3.3 (4294967295/4294967295), GigabitEthernet0/1

What does this output indicate?

Question 1hardmultiple choice

Study the full EIGRP explanation →

A
The route 10.3.3.0/24 is stuck-in-active because replies have not been received from all neighbors.
The Active state with FD Infinity and no successors indicates EIGRP is waiting for replies, which can lead to a stuck-in-active condition if not resolved.
B
The route 10.3.3.0/24 is passive and has two feasible successors.
Why wrong: The route is Active, not Passive, and has no successors.
C
The route 10.3.3.0/24 is learned via both neighbors with equal metrics.
Why wrong: The metrics are 4294967295, which indicates unreachable, not equal.
D
The route 10.3.3.0/24 is installed in the routing table via both neighbors.
Why wrong: Active routes are not installed in the routing table.

Full breakdown with real-world context →

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 route 10.3.3.0/24 is stuck-in-active because replies have not been received from all neighbors.

The route 10.3.3.0/24 is in Active state with no successors and FD set to Infinity, meaning EIGRP is actively querying neighbors for this route and has not yet received a reply. The metric of 4294967295 indicates an unreachable route.

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 route 10.3.3.0/24 is stuck-in-active because replies have not been received from all neighbors.
Why this is correct
The Active state with FD Infinity and no successors indicates EIGRP is waiting for replies, which can lead to a stuck-in-active condition if not resolved.
Related concept
OSPF neighbours must agree on key parameters.
✗
The route 10.3.3.0/24 is passive and has two feasible successors.
Why it's wrong here
The route is Active, not Passive, and has no successors.
✗
The route 10.3.3.0/24 is learned via both neighbors with equal metrics.
Why it's wrong here
The metrics are 4294967295, which indicates unreachable, not equal.
✗
The route 10.3.3.0/24 is installed in the routing table via both neighbors.
Why it's wrong here
Active routes are not installed in the routing table.

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 route 10.3.3.0/24 is stuck-in-active because replies have not been received from all neighbors. — The route 10.3.3.0/24 is in Active state with no successors and FD set to Infinity, meaning EIGRP is actively querying neighbors for this route and has not yet received a reply. The metric of 4294967295 indicates an unreachable route.

What should I do if I get this 300-410 question wrong?

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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