Question 1,752 of 2,152

EIGRP Troubleshooting →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the route to 10.40.40.0/24 is stuck-in-active, which indicates a potential network instability. This is correct because the topology table shows the route in the Active state (coded as "A") with an infinite feasible distance (FD is Infinity) and zero successors, meaning the router has sent out queries for a successor but has not received all replies, leaving the route in an unresolved active state. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to troubleshoot EIGRP active state and stuck-in-active conditions, a common topic where routers fail to receive replies from neighbors due to unidirectional links, packet loss, or a neighbor going down. A common trap is confusing the "A" code with a normal query process; remember that a route stuck in Active for more than three minutes triggers the SIA condition, which can destabilize the entire EIGRP domain. Memory tip: "Active with Infinity means SIA—no successor, just a mess."

300-410 EIGRP Troubleshooting Practice Question

This 300-410 practice question tests your understanding of eigrp troubleshooting. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 on Router R1:

R1# show ip eigrp topology

EIGRP-IPv4 Topology Table for AS(100)/ID(192.168.1.1) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status

P 10.10.10.0/24, 1 successors, FD is 28160 via 10.1.1.2 (28160/28160), GigabitEthernet0/0 P 10.20.20.0/24, 1 successors, FD is 28160 via 10.2.2.2 (28160/28160), GigabitEthernet0/1 P 10.30.30.0/24, 1 successors, FD is 28160 via 10.3.3.2 (28160/28160), GigabitEthernet0/2 A 10.40.40.0/24, 0 successors, FD is Infinity via 10.4.4.2 (Infinity/Infinity), GigabitEthernet0/3

Based on this output, what is the problem?

Question 1hardmultiple choice

Study the full EIGRP explanation →

A
The route to 10.40.40.0/24 is stuck-in-active and may cause a network instability.
A route in Active state with no successor indicates that the router is querying neighbors and has not received a reply, which can lead to SIA.
B
The route to 10.40.40.0/24 is passive and stable.
Why wrong: The code 'A' indicates Active, not Passive.
C
The route to 10.30.30.0/24 has a feasible successor.
Why wrong: The output shows only one successor for 10.30.30.0/24; no feasible successor is listed.
D
All routes are in a stable passive state.
Why wrong: The route to 10.40.40.0/24 is Active, so not all routes are passive.

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 to 10.40.40.0/24 is stuck-in-active and may cause a network instability.

The topology table shows that the route to 10.40.40.0/24 is in Active state (A), meaning the router is actively querying for a successor. The FD is Infinity, indicating no feasible successor is available. This could be due to a network failure or a stuck-in-active condition.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 to 10.40.40.0/24 is stuck-in-active and may cause a network instability.
Why this is correct
A route in Active state with no successor indicates that the router is querying neighbors and has not received a reply, which can lead to SIA.
Related concept
Read the scenario before looking for a memorised answer.
✗
The route to 10.40.40.0/24 is passive and stable.
Why it's wrong here
The code 'A' indicates Active, not Passive.
✗
The route to 10.30.30.0/24 has a feasible successor.
Why it's wrong here
The output shows only one successor for 10.30.30.0/24; no feasible successor is listed.
✗
All routes are in a stable passive state.
Why it's wrong here
The route to 10.40.40.0/24 is Active, so not all routes are passive.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Trap categories for this question

Command / output trap
The output shows only one successor for 10.30.30.0/24; no feasible successor is listed.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this 300-410 question test?

EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The route to 10.40.40.0/24 is stuck-in-active and may cause a network instability. — The topology table shows that the route to 10.40.40.0/24 is in Active state (A), meaning the router is actively querying for a successor. The FD is Infinity, indicating no feasible successor is available. This could be due to a network failure or a stuck-in-active condition.

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

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

1 more ways this is tested on 300-410

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A network engineer runs the following command on Router R1: R1# show ip eigrp topology 10.50.50.0/24 EIGRP-IPv4 Topology Entry for AS(100)/ID(192.168.1.1) for 10.50.50.0/24 State: Active, Reply status: 0, Originating router: 192.168.1.1 Routing Descriptor Blocks: 10.1.1.2 (GigabitEthernet0/0), from 10.1.1.2, Send flag: 0x0 Composite metric: (4294967295/4294967295), Route is Internal Vector metric: Minimum bandwidth: 100000 Kbit Total delay: 100 microseconds Reliability: 255/255 Load: 1/255 Minimum MTU: 1500 Hop count: 1 Based on this output, what is the problem?

hard

✓ A.The route is in Active state with an infinite metric, indicating that the router has lost the route and is querying for a new path.
B.The route is passive and stable.
C.The metric of 4294967295 is normal for a summary route.
D.The hop count of 1 indicates the route is one hop away and reachable.

Why A: The route to 10.50.50.0/24 is in Active state, meaning the router is actively querying for a successor. The composite metric is 4294967295 (Infinity), indicating that the route is unreachable. This is a problem because the router has lost the route and is trying to find an alternative path.

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Question Discussion

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