Question 31 of 2,152

DMVPN →hardMultiple ChoiceObjective-mapped

EIGRP Stub in Named Mode — Stuck-in-Active Spoke Loss | Cisco CCNP ENARSI 300-410 Explained

This 300-410 practice question tests your understanding of dmvpn. 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.

An engineer configures EIGRP named mode on a DMVPN Phase 3 hub with 'eigrp stub' on the spoke routers. Unexpectedly, when a spoke loses its WAN connection to the hub, the hub's EIGRP table shows the spoke's routes as active (stuck-in-active) for an extended period. Which is the most likely explanation?

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.

A
The spoke's EIGRP stub configuration in named mode does not suppress query propagation for all routes; the hub queries the spoke for routes that are not in the stub's advertised set, causing a stuck-in-active when the spoke is unreachable.
In named mode, the stub command only limits the routes the spoke advertises, but the hub still sends queries to the spoke for all routes. If the spoke is unreachable, the query remains active until the active timer expires.
B
The spoke's EIGRP stub configuration in named mode automatically sets the 'receive-only' flag, preventing any queries from being sent to the spoke.
Why wrong: 'receive-only' is a separate configuration; default stub in named mode includes 'connected' and 'summary', not 'receive-only'.
C
The DMVPN tunnel interface on the spoke is configured with 'eigrp stub', which causes the spoke to ignore queries from the hub, but the hub still expects a reply.
Why wrong: The stub configuration does not cause the spoke to ignore queries; it limits the routes advertised but does not affect query processing.
D
The hub's EIGRP process is in classic mode, while the spoke is in named mode, causing a mismatch in the stub behavior.
Why wrong: EIGRP classic mode and named mode are interoperable; the stub behavior differences are within named mode itself.

Full breakdown with real-world context →

Quick Answer

The most likely explanation is that the spoke’s EIGRP stub configuration in named mode does not suppress query propagation for all routes, so the hub still queries the spoke for routes not in the stub’s advertised set, causing a stuck-in-active when the spoke becomes unreachable. In named mode, the default stub setting only advertises connected and summary routes, but if the spoke has additional networks—such as loopbacks or redistributed routes—the hub will send queries for those, and without a reachable reply, the query times out, triggering the stuck-in-active condition. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding that EIGRP stub in named mode is not a blanket query suppressor; a common trap is assuming the stub keyword alone prevents all queries, but you must explicitly use a leak-map or configure receive-only to fully block them. Memory tip: “Stub stops some, not all—queries leak through unless you plug the hole with a leak-map.”

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's EIGRP stub configuration in named mode does not suppress query propagation for all routes; the hub queries the spoke for routes that are not in the stub's advertised set, causing a stuck-in-active when the spoke is unreachable.

In EIGRP named mode, the stub feature by default includes 'connected' and 'summary' routes, but not 'static' or 'redistributed'. If the spoke is configured as a stub with the default settings, it does not advertise any routes beyond its connected interfaces. However, if the spoke has a loopback or other network that is not directly connected to the EIGRP process, the hub may still query the spoke for those routes, and if the spoke is unreachable, the query times out, causing a stuck-in-active. The corner case is that the stub configuration in named mode does not suppress query propagation for all routes unless explicitly configured with 'leak-map' or 'receive-only'.

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's EIGRP stub configuration in named mode does not suppress query propagation for all routes; the hub queries the spoke for routes that are not in the stub's advertised set, causing a stuck-in-active when the spoke is unreachable.
Why this is correct
In named mode, the stub command only limits the routes the spoke advertises, but the hub still sends queries to the spoke for all routes. If the spoke is unreachable, the query remains active until the active timer expires.
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 spoke's EIGRP stub configuration in named mode automatically sets the 'receive-only' flag, preventing any queries from being sent to the spoke.
Why it's wrong here
'receive-only' is a separate configuration; default stub in named mode includes 'connected' and 'summary', not 'receive-only'.
✗
The DMVPN tunnel interface on the spoke is configured with 'eigrp stub', which causes the spoke to ignore queries from the hub, but the hub still expects a reply.
Why it's wrong here
The stub configuration does not cause the spoke to ignore queries; it limits the routes advertised but does not affect query processing.
✗
The hub's EIGRP process is in classic mode, while the spoke is in named mode, causing a mismatch in the stub behavior.
Why it's wrong here
EIGRP classic mode and named mode are interoperable; the stub behavior differences are within named mode itself.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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 300-410 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.

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.

Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this 300-410 question test?

DMVPN — This question tests DMVPN — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The spoke's EIGRP stub configuration in named mode does not suppress query propagation for all routes; the hub queries the spoke for routes that are not in the stub's advertised set, causing a stuck-in-active when the spoke is unreachable. — In EIGRP named mode, the stub feature by default includes 'connected' and 'summary' routes, but not 'static' or 'redistributed'. If the spoke is configured as a stub with the default settings, it does not advertise any routes beyond its connected interfaces. However, if the spoke has a loopback or other network that is not directly connected to the EIGRP process, the hub may still query the spoke for those routes, and if the spoke is unreachable, the query times out, causing a stuck-in-active. The corner case is that the stub configuration in named mode does not suppress query propagation for all routes unless explicitly configured with 'leak-map' or 'receive-only'.

What should I do if I get this 300-410 question wrong?

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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