- 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.
Question 1,045 of 2,152
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?
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 'A' code for route 10.3.3.0/24 indicates it is in the Active state, meaning the router has sent Queries for this route and is waiting for Replies from all neighbors. The FD (Feasible Distance) is 'Infinity' (4294967295), and both successors are 0, confirming the route is not usable. The 's' (sia Status) code is not shown, but the Active state with no successors and infinite metrics directly points to a stuck-in-active (SIA) condition where replies have not been received from all neighbors, causing the route to remain active.
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 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
Read the scenario before looking for a memorised answer.
- ✗
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: answer the scenario, not the keyword
Cisco often tests the distinction between the 'A' (Active) and 'P' (Passive) codes in the 'show ip eigrp topology all-links' output, and candidates mistakenly assume that seeing two next hops means the route is installed or has feasible successors, ignoring the Active state and Infinity metrics.
Detailed technical explanation
How to think about this question
In EIGRP, when a route enters the Active state, the router sends Queries to all neighbors and starts a timer (default 3 minutes). If all Replies are not received within that timer, the route transitions to stuck-in-active (SIA), and the router resets the neighbor relationship with the non-responding neighbor. The metric value 4294967295 is the maximum 32-bit unsigned integer, used to represent Infinity in EIGRP, effectively making the route unreachable. This behavior is defined in RFC 7868 and is critical for loop-free path selection.
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.
TExam Day Tips
- 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 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.
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
What to study next
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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 10.3.3.0/24 is stuck-in-active because replies have not been received from all neighbors. — The 'A' code for route 10.3.3.0/24 indicates it is in the Active state, meaning the router has sent Queries for this route and is waiting for Replies from all neighbors. The FD (Feasible Distance) is 'Infinity' (4294967295), and both successors are 0, confirming the route is not usable. The 's' (sia Status) code is not shown, but the Active state with no successors and infinite metrics directly points to a stuck-in-active (SIA) condition where replies have not been received from all neighbors, causing the route to remain active.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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