- A
A stub router advertises only connected and summary routes to its neighbors.
This is the core definition of EIGRP stub routing: it filters out all other routes from advertisements.
- B
The stub feature is configured on the hub router to limit queries from spokes.
Why wrong: Stub is configured on the spoke router, not the hub, to prevent the spoke from being a transit router.
- C
A stub router will send a query to its neighbors if it loses a route.
Why wrong: Stub routers do not send queries; they reply with 'Stub' to any queries received, indicating they have no alternate paths.
- D
Stub routers do not advertise any connected routes unless specifically configured.
Why wrong: By default, stub routers advertise connected routes; the 'receive-only' keyword suppresses this.
- E
The hub router must have the stub command configured to accept stub advertisements.
Why wrong: No special configuration is needed on the hub; it automatically recognizes stub neighbors via the EIGRP hello packet.
EIGRP Stub Routing Troubleshooting
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.
Which TWO statements about EIGRP stub routing are true when troubleshooting a hub-and-spoke topology? (Choose TWO.)
Quick Answer
The correct answer is that a stub router advertises only connected and summary routes to its neighbors, which is why this statement is true when troubleshooting EIGRP stub routing in a hub-and-spoke topology. This behavior is fundamental to the stub feature: it prevents the spoke router from being used as a transit point, so it will not forward traffic for other routes learned from the hub or other spokes. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of how stub routing reduces query scope and improves convergence in hub-and-spoke designs. A common trap is assuming the hub router also needs stub configuration—it does not; only the spoke is configured as a stub. Another trap is thinking stub routers stop advertising connected routes, but they still advertise them by default. For a quick memory tip, remember “Stub Spoke Stops Transit”: the spoke is the stub, and it stops being a transit router by only sending connected and summary routes.
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
A stub router advertises only connected and summary routes to its neighbors.
Option A is correct: By default, an EIGRP stub router advertises only its connected and summary routes to neighbors, which prevents it from being used as a transit router. This is essential in hub-and-spoke topologies to limit query propagation. Options B, C, D, and E are all incorrect. The stub feature is configured on the spoke router, not the hub (B). Stub routers do not send queries (C). They advertise connected routes by default (D). The hub does not need the stub command to accept stub advertisements; the stub command is only needed on the spoke (E). Therefore, only option A is a true statement among the choices.
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.
- ✓
A stub router advertises only connected and summary routes to its neighbors.
Why this is correct
This is the core definition of EIGRP stub routing: it filters out all other routes from advertisements.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The stub feature is configured on the hub router to limit queries from spokes.
Why it's wrong here
Stub is configured on the spoke router, not the hub, to prevent the spoke from being a transit router.
- ✗
A stub router will send a query to its neighbors if it loses a route.
Why it's wrong here
Stub routers do not send queries; they reply with 'Stub' to any queries received, indicating they have no alternate paths.
- ✗
Stub routers do not advertise any connected routes unless specifically configured.
Why it's wrong here
By default, stub routers advertise connected routes; the 'receive-only' keyword suppresses this.
- ✗
The hub router must have the stub command configured to accept stub advertisements.
Why it's wrong here
No special configuration is needed on the hub; it automatically recognizes stub neighbors via the EIGRP hello packet.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that the stub feature is configured on the hub router to limit queries from spokes, but in reality, it is configured on the spoke router to prevent it from being queried.
Trap categories for this question
Keyword trap
By default, stub routers advertise connected routes; the 'receive-only' keyword suppresses this.
Detailed technical explanation
How to think about this question
EIGRP stub routing uses the 'eigrp stub' command on the spoke router, which can be modified with keywords like 'connected', 'static', 'summary', or 'receive-only' to control which routes are advertised. Under the hood, the stub router sets a flag in its hello packets to inform neighbors that it is a stub, causing the hub to never send queries to it, thus preventing query storms in large hub-and-spoke networks. In a real-world scenario, this is critical for remote branch offices with limited bandwidth or CPU, as it ensures the spoke does not participate in complex EIGRP convergence events.
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
Got this wrong? Here's your next step.
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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: A stub router advertises only connected and summary routes to its neighbors. — Option A is correct: By default, an EIGRP stub router advertises only its connected and summary routes to neighbors, which prevents it from being used as a transit router. This is essential in hub-and-spoke topologies to limit query propagation. Options B, C, D, and E are all incorrect. The stub feature is configured on the spoke router, not the hub (B). Stub routers do not send queries (C). They advertise connected routes by default (D). The hub does not need the stub command to accept stub advertisements; the stub command is only needed on the spoke (E). Therefore, only option A is a true statement among the choices.
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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