The answer is that the router is configured as an EIGRP stub with 'receive-only', which prevents it from installing any EIGRP routes. This occurs because the 'receive-only' keyword explicitly tells the router to accept routes from neighbors but never advertise or install any EIGRP-learned prefixes into its own routing table, even though the topology table shows them in a passive state with a feasible distance. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of EIGRP stub behavior in named mode, where the address-family configuration can easily hide this restrictive setting. A common trap is assuming a route in the topology table will automatically be installed, but the stub's receive-only mode breaks that assumption. Remember the memory tip: "Receive-only means receive, but never believe"—the router learns the route but refuses to install it.
300-410 Route Redistribution Practice Question
This 300-410 practice question tests your understanding of route redistribution. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 router. A route is learned via EIGRP, but the router does not install it in the routing table. The show ip eigrp topology shows the route in passive state with a feasible distance. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The router is configured as an EIGRP stub with 'receive-only', which prevents it from installing any EIGRP routes.
In named mode, EIGRP uses address-family configuration. The route may be learned but not installed if the 'no ip route-cache' or 'no ip routing' is misconfigured, or if the route is suppressed by a route-map. However, a common edge case is that the route is an internal route but the router is configured as a stub with 'receive-only', which prevents installing any routes.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 route is an external route and the EIGRP administrative distance is set to 255.
Why it's wrong here
AD of 255 means route is not installed, but this is not default.
✓
The router is configured as an EIGRP stub with 'receive-only', which prevents it from installing any EIGRP routes.
Why this is correct
Stub receive-only blocks all EIGRP routes from being installed.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The 'metric weights' command is misconfigured, causing incorrect metric calculation.
Why it's wrong here
Metric weights affect path selection, not installation.
✗
The route is a summary route that is not advertised due to 'summary-address' configuration.
Why it's wrong here
Summary routes are created locally, not learned.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
Route Redistribution — This question tests Route Redistribution — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The router is configured as an EIGRP stub with 'receive-only', which prevents it from installing any EIGRP routes. — In named mode, EIGRP uses address-family configuration. The route may be learned but not installed if the 'no ip route-cache' or 'no ip routing' is misconfigured, or if the route is suppressed by a route-map. However, a common edge case is that the route is an internal route but the router is configured as a stub with 'receive-only', which prevents installing any routes.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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