hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures EIGRP named mode on a…
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?
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'.
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.
- ✗
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.
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.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
DMVPN Phase 3
DMVPN Phase 3 is a Cisco networking technology that allows branch offices to connect directly to each other without always going through a central hub, but with smarter routing that lets the hub control the traffic paths more efficiently.
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