Question 761 of 1,958
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350-401 Practice Question: Is designing an EIGRP network with multiple…
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?
⚠ Common exam trap
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.
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).
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.
- ✗
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.
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.
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Last reviewed: Jun 24, 2026
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