- A
The spoke routers are configured with 'eigrp stub receive-only', which prevents them from advertising any routes, so the hub does not have routes to the spoke's networks.
Correct. The 'receive-only' keyword prevents the spoke from advertising any routes, including its connected networks. The hub then cannot reach the spoke's networks, and the spoke may not learn routes that depend on those advertisements.
- B
The 'eigrp stub' command prevents the spoke from learning routes from the hub.
Why wrong: Incorrect. The stub command affects what the spoke advertises, not what it learns. Spoke routers can still learn routes from the hub.
- C
The hub router is also configured as stub, which prevents route propagation.
Why wrong: Incorrect. If the hub is stub, it would not advertise routes to spokes, but the scenario implies the hub was working before.
- D
The spoke routers have a different EIGRP autonomous system number than the hub.
Why wrong: Incorrect. If AS numbers differ, no adjacency would form, but the scenario says they were learning routes before.
Quick Answer
The answer is that the spoke routers are configured with 'eigrp stub receive-only', which prevents them from advertising any routes, so the hub lacks routes back to the spoke’s networks. This occurs because the receive-only mode is the most restrictive EIGRP stub setting—it instructs the spoke to learn routes exclusively while suppressing all outbound advertisements, including its directly connected or summarized networks. On the ENCOR 350-401 exam, this scenario tests your understanding of how stub routing impacts route learning in hub-and-spoke topologies, often appearing as a trap where candidates confuse receive-only with the default connected-and-summary stub mode. A common memory tip is to think of “receive-only” as a one-way street: the spoke gets routes but gives nothing back, breaking return reachability. Remember the mnemonic “R.O. blocks the flow”—Receive-Only cuts off all outbound route flow, leaving the hub blind to the spoke’s networks.
350-401 EIGRP Practice Question
This 350-401 practice question tests your understanding of eigrp. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is designing an EIGRP network with multiple routers in a hub-and-spoke topology. The engineer wants to ensure that the spoke routers do not become transit routers for traffic between other spokes. The engineer configures 'eigrp stub' on the spoke routers. However, after configuration, the spoke routers stop learning some routes from the hub. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 spoke routers are configured with 'eigrp stub receive-only', which prevents them from advertising any routes, so the hub does not have routes to the spoke's networks.
The 'eigrp stub receive-only' command configures the spoke router to only receive routes and not advertise any of its own networks. This causes the hub router to lack routes to the spoke's directly connected or summarized networks, breaking reachability from the hub to the spoke. The correct answer is A because this specific stub mode prevents the spoke from advertising any routes, which is the most likely reason the spoke stops learning some routes from the hub (since the hub may not have a route back to the spoke's networks).
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 spoke routers are configured with 'eigrp stub receive-only', which prevents them from advertising any routes, so the hub does not have routes to the spoke's networks.
Why this is correct
Correct. The 'receive-only' keyword prevents the spoke from advertising any routes, including its connected networks. The hub then cannot reach the spoke's networks, and the spoke may not learn routes that depend on those advertisements.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'eigrp stub' command prevents the spoke from learning routes from the hub.
Why it's wrong here
Incorrect. The stub command affects what the spoke advertises, not what it learns. Spoke routers can still learn routes from the hub.
- ✗
The hub router is also configured as stub, which prevents route propagation.
Why it's wrong here
Incorrect. If the hub is stub, it would not advertise routes to spokes, but the scenario implies the hub was working before.
- ✗
The spoke routers have a different EIGRP autonomous system number than the hub.
Why it's wrong here
Incorrect. If AS numbers differ, no adjacency would form, but the scenario says they were learning routes before.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that 'eigrp stub' prevents a router from learning routes, when in fact it only restricts the routes the router advertises, and the 'receive-only' keyword is the specific variant that stops all advertisements, causing the hub to lack routes to the spoke's networks.
Trap categories for this question
Command / output trap
Incorrect. The stub command affects what the spoke advertises, not what it learns. Spoke routers can still learn routes from the hub.
Scenario analysis trap
Incorrect. If the hub is stub, it would not advertise routes to spokes, but the scenario implies the hub was working before.
Detailed technical explanation
How to think about this question
EIGRP stub routing is designed to prevent spoke routers from becoming transit routers by restricting the types of routes they advertise (e.g., only connected and summary routes by default). The 'receive-only' keyword is the most restrictive stub mode, which suppresses all outbound route advertisements from the spoke, including its own connected networks. In a hub-and-spoke topology, this can cause the hub to have no route to the spoke's networks, leading to asymmetric routing or unreachability, which is why the spoke may appear to stop learning some routes (e.g., if the hub filters routes based on reverse path checks).
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 practitioner preparing for the 350-401 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
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FAQ
Questions learners often ask
What does this 350-401 question test?
EIGRP — This question tests EIGRP — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The spoke routers are configured with 'eigrp stub receive-only', which prevents them from advertising any routes, so the hub does not have routes to the spoke's networks. — The 'eigrp stub receive-only' command configures the spoke router to only receive routes and not advertise any of its own networks. This causes the hub router to lack routes to the spoke's directly connected or summarized networks, breaking reachability from the hub to the spoke. The correct answer is A because this specific stub mode prevents the spoke from advertising any routes, which is the most likely reason the spoke stops learning some routes from the hub (since the hub may not have a route back to the spoke's networks).
What should I do if I get this 350-401 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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