Question 535 of 2,015

EIGRP →hardMultiple SelectObjective-mapped

Quick Answer

The answer is that a stub router can be configured as 'receive-only' to not advertise any routes, which is one of three true statements about EIGRP stub routing. This configuration is correct because EIGRP stub routing is designed to limit query scope and improve convergence in hub-and-spoke topologies, where the stub router (spoke) advertises only its directly connected and summary routes to the hub, but never queries its neighbors, and the hub reciprocates by not sending queries to the stub. On the ENCOR 350-401 exam, this concept tests your understanding of how stub routers prevent unnecessary query propagation, often appearing in a "choose three" format with traps like assuming a stub can forward queries or that it must advertise all routes. A common memory tip is to think of the stub as a "silent leaf"—it only tells the hub about its own routes and never asks for updates, with the 'receive-only' option making it completely silent. Remember the mnemonic "No Queries, No Queries" to recall that stubs neither send nor receive queries.

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.

Which three statements about EIGRP stub routing are true? (Choose three.)

Question 1hardmulti select

Study the full EIGRP explanation →

A
A stub router does not send Query packets to its neighbors.
Correct because stub routers are not allowed to originate queries; they rely on the hub for routing information.
B
A hub router will send queries to a stub router when a route is lost.
Why wrong: Incorrect because the hub router does not send queries to a stub router, as the stub is not expected to have alternative paths.
C
The 'eigrp stub' command can be configured with the 'connected' keyword to advertise only connected routes.
Correct because the 'connected' keyword limits the stub to advertising only directly connected networks.
D
Stub routing is used to reduce the size of the routing table on the hub router.
Why wrong: Incorrect because stub routing primarily reduces query propagation and convergence time, not the routing table size on the hub.
E
A stub router can be configured as 'receive-only' to not advertise any routes.
Correct because the 'receive-only' keyword prevents the stub from advertising any routes; it only receives routes from the hub.

Full breakdown with real-world context →

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 does not send Query packets to its neighbors.

EIGRP stub routing is used to limit the query scope and improve convergence. A stub router is typically a spoke in a hub-and-spoke topology. It advertises its directly connected and summary routes to the hub, but does not query its neighbors. The hub router does not send queries to the stub router. The stub router can be configured with different options: connected, static, summary, receive-only, or redistributed. The 'eigrp stub' command enables this feature.

Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

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 does not send Query packets to its neighbors.
Why this is correct
Correct because stub routers are not allowed to originate queries; they rely on the hub for routing information.
Related concept
OSPF neighbours must agree on key parameters.
✗
A hub router will send queries to a stub router when a route is lost.
Why it's wrong here
Incorrect because the hub router does not send queries to a stub router, as the stub is not expected to have alternative paths.
✓
The 'eigrp stub' command can be configured with the 'connected' keyword to advertise only connected routes.
Why this is correct
Correct because the 'connected' keyword limits the stub to advertising only directly connected networks.
Related concept
OSPF neighbours must agree on key parameters.
✗
Stub routing is used to reduce the size of the routing table on the hub router.
Why it's wrong here
Incorrect because stub routing primarily reduces query propagation and convergence time, not the routing table size on the hub.
✓
A stub router can be configured as 'receive-only' to not advertise any routes.
Why this is correct
Correct because the 'receive-only' keyword prevents the stub from advertising any routes; it only receives routes from the hub.
Related concept
OSPF neighbours must agree on key parameters.

Common exam traps

Common exam trap: OSPF can fail even when IP connectivity looks correct

OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.

Detailed technical explanation

How to think about this question

OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.

KKey Concepts to Remember

OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.

TExam Day Tips

Check area mismatch first when OSPF adjacency fails.
Review passive interfaces when a network is advertised but no neighbour forms.
Use show ip ospf neighbor and show ip route clues carefully.

Key takeaway

OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.

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.

What to study next

Got this wrong? Here's your next step.

Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.

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FAQ

Questions learners often ask

What does this 350-401 question test?

EIGRP — This question tests EIGRP — OSPF neighbours must agree on key parameters..

What is the correct answer to this question?

The correct answer is: A stub router does not send Query packets to its neighbors. — EIGRP stub routing is used to limit the query scope and improve convergence. A stub router is typically a spoke in a hub-and-spoke topology. It advertises its directly connected and summary routes to the hub, but does not query its neighbors. The hub router does not send queries to the stub router. The stub router can be configured with different options: connected, static, summary, receive-only, or redistributed. The 'eigrp stub' command enables this feature.

What should I do if I get this 350-401 question wrong?

What is the key concept behind this question?

OSPF neighbours must agree on key parameters.

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Same concept, more angles

1 more ways this is tested on 350-401

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. Which two statements about EIGRP stub routing are true? (Choose two.)

medium

✓ A.A stub router advertises only connected and summary routes by default.
B.A stub router can still be used as a transit router for other EIGRP neighbors.
C.The 'eigrp stub' command is configured on the hub router in a hub-and-spoke topology.
✓ D.EIGRP stub routing reduces query scoping and improves convergence.
E.A stub router can be configured with the 'receive-only' keyword to advertise all its routes.

Why A: EIGRP stub routing limits the routes a stub router advertises, preventing it from being used as a transit router. Common stub types include connected, static, summary, and receive-only.

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