- A
R2 has 'passive-interface default' configured, which prevents it from sending query replies back to R1.
Why wrong: Incorrect. The scenario states R1 has passive-interface default, not R2. Additionally, passive-interface on R1 would prevent neighbor formation, not cause an Active state neighbor.
- B
R1 has a route-map that filters the query for prefix 10.0.0.0/24.
Correct. A route-map filtering the specific prefix 10.0.0.0/24 can block the query from being sent to R2, so R2 never replies, causing SIA.
- C
The EIGRP K-values mismatch between R1 and R2 causes neighbor relationship issues.
Why wrong: Incorrect. K-values mismatch would prevent the EIGRP neighbor relationship from forming at all, but here the neighbor exists.
- D
The network 10.0.0.0 is not directly connected; need redistribution.
Why wrong: Incorrect. The network command under EIGRP includes 10.0.0.0/24, so no redistribution is needed. This does not cause SIA.
300-410 EIGRP Active State Practice Question
This 300-410 practice question tests your understanding of mpls operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: eIGRP Active State. 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.
EIGRP stuck-in-active (SIA) occurs in a large network. Router R1 shows 'show ip eigrp topology 10.0.0.0/24' output: 'P 10.0.0.0/24, 1 successors, FD is 128000, Q is 0, SIA is 00:01:00' and 'show ip eigrp neighbors' shows neighbor R2 in state 'Active'. R1 configuration includes 'router eigrp 100 network 10.0.0.0 passive-interface default'. What is the root cause?
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
R1 has a route-map that filters the query for prefix 10.0.0.0/24.
EIGRP SIA occurs when a router does not receive a reply to its query within the active timer. The scenario shows R1 has a neighbor R2 in Active state, but R1's configuration includes 'passive-interface default', which would normally prevent neighbor formation. Since the neighbor exists, the passive-interface default is likely overridden or not affecting the interface to R2. Option B is the most plausible cause: R1 has a route-map that filters the query for prefix 10.0.0.0/24, preventing the query from being sent to R2. Without receiving the query, R2 cannot reply, leading to SIA.
Key principle: EIGRP Active State
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
R2 has 'passive-interface default' configured, which prevents it from sending query replies back to R1.
Why it's wrong here
Incorrect. The scenario states R1 has passive-interface default, not R2. Additionally, passive-interface on R1 would prevent neighbor formation, not cause an Active state neighbor.
- ✓
R1 has a route-map that filters the query for prefix 10.0.0.0/24.
Why this is correct
Correct. A route-map filtering the specific prefix 10.0.0.0/24 can block the query from being sent to R2, so R2 never replies, causing SIA.
Related concept
EIGRP Active State
- ✗
The EIGRP K-values mismatch between R1 and R2 causes neighbor relationship issues.
Why it's wrong here
Incorrect. K-values mismatch would prevent the EIGRP neighbor relationship from forming at all, but here the neighbor exists.
- ✗
The network 10.0.0.0 is not directly connected; need redistribution.
Why it's wrong here
Incorrect. The network command under EIGRP includes 10.0.0.0/24, so no redistribution is needed. This does not cause SIA.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Passive-interface is often blamed for SIA, but here the actual cause is a distribute-list or route-map that filters the specific query. Ensure you check for route filtering when neighbors exist and SIA occurs.
Trap categories for this question
Command / output trap
Incorrect. The network command under EIGRP includes 10.0.0.0/24, so no redistribution is needed. This does not cause SIA.
Scenario analysis trap
Incorrect. The scenario states R1 has passive-interface default, not R2. Additionally, passive-interface on R1 would prevent neighbor formation, not cause an Active state neighbor.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- EIGRP Active State
- Distribute-list
- Stuck-in-Active (SIA)
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
EIGRP Active State
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?
MPLS Operations — This question tests MPLS Operations — EIGRP Active State.
What is the correct answer to this question?
The correct answer is: R1 has a route-map that filters the query for prefix 10.0.0.0/24. — EIGRP SIA occurs when a router does not receive a reply to its query within the active timer. The scenario shows R1 has a neighbor R2 in Active state, but R1's configuration includes 'passive-interface default', which would normally prevent neighbor formation. Since the neighbor exists, the passive-interface default is likely overridden or not affecting the interface to R2. Option B is the most plausible cause: R1 has a route-map that filters the query for prefix 10.0.0.0/24, preventing the query from being sent to R2. Without receiving the query, R2 cannot reply, leading to SIA.
What should I do if I get this 300-410 question wrong?
Review eIGRP Active State, then practise related 300-410 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
EIGRP Active State
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Last reviewed: Jun 18, 2026
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