- A
Named mode EIGRP uses a different metric calculation algorithm that is more sensitive to weight changes.
Why wrong: The metric calculation is the same; the issue is with how the change is applied.
- B
Named mode EIGRP requires a 'metric weights' change to be followed by a 'clear ip eigrp neighbors' command; otherwise, the router sends incorrect queries.
In named mode, changing k-values without resetting neighbors causes the router to use the new metric for new queries but the old metric for existing routes, leading to inconsistencies and SIA.
- C
Named mode EIGRP does not support changing k-values on the fly; it must be done during maintenance.
Why wrong: It does support it, but the change must be propagated correctly to avoid SIA.
- D
Named mode EIGRP automatically adjusts the metric weights to match neighbors, causing a temporary SIA.
Why wrong: Named mode does not automatically adjust metric weights; it uses the configured values.
Quick Answer
The answer is that named mode EIGRP requires a manual neighbor reset after changing metric weights, while classic mode does not. This happens because named mode does not automatically trigger a clear ip eigrp neighbors command when k-values are modified, so the router continues using old metric weights for established adjacencies while sending queries with the new weights. The resulting k-value mismatch causes incorrect query propagation, leading to a stuck-in-active (SIA) condition for the affected route. On the Cisco CCNP ENARSI 300-410 exam, this question tests your understanding of how EIGRP named mode handles metric weight changes differently from classic mode—a common trap is assuming both modes behave identically. Remember the memory tip: “Named mode needs a nudge”—after any metric weights change, you must manually clear neighbors to avoid SIA.
300-410 Device Access Control Practice Question
This 300-410 practice question tests your understanding of device access control. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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. After making a change to the metric weights, the router becomes stuck-in-active (SIA) for a route. Why does this happen in named mode but not in classic mode?
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
Named mode EIGRP requires a 'metric weights' change to be followed by a 'clear ip eigrp neighbors' command; otherwise, the router sends incorrect queries.
In named mode EIGRP, changing metric weights (k-values) does not automatically trigger a neighbor reset. Without a 'clear ip eigrp neighbors' command, the router continues to use the old k-values for existing neighbors while sending queries with the new k-values, causing a mismatch that leads to stuck-in-active (SIA) routes. Classic mode EIGRP automatically resets neighbors when metric weights change, avoiding this issue.
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.
- ✗
Named mode EIGRP uses a different metric calculation algorithm that is more sensitive to weight changes.
Why it's wrong here
The metric calculation is the same; the issue is with how the change is applied.
- ✓
Named mode EIGRP requires a 'metric weights' change to be followed by a 'clear ip eigrp neighbors' command; otherwise, the router sends incorrect queries.
Why this is correct
In named mode, changing k-values without resetting neighbors causes the router to use the new metric for new queries but the old metric for existing routes, leading to inconsistencies and SIA.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Named mode EIGRP does not support changing k-values on the fly; it must be done during maintenance.
Why it's wrong here
It does support it, but the change must be propagated correctly to avoid SIA.
- ✗
Named mode EIGRP automatically adjusts the metric weights to match neighbors, causing a temporary SIA.
Why it's wrong here
Named mode does not automatically adjust metric weights; it uses the configured values.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the subtle difference that named mode EIGRP requires an explicit 'clear ip eigrp neighbors' after changing metric weights, while classic mode handles it automatically, leading candidates to assume both modes behave identically.
Detailed technical explanation
How to think about this question
EIGRP uses the Diffusing Update Algorithm (DUAL) to maintain loop-free paths. When metric weights change, the router must recompute feasible distances and send queries to neighbors; if neighbors still use old k-values, they may not respond correctly, causing the query to remain active beyond the SIA timer (default 3 minutes). In classic mode, the 'metric weights' command automatically triggers a neighbor reset via the 'clear ip eigrp neighbors' process, ensuring all routers use consistent k-values before queries are sent.
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.
TExam Day Tips
- 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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Access Control — This question tests Device Access Control — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Named mode EIGRP requires a 'metric weights' change to be followed by a 'clear ip eigrp neighbors' command; otherwise, the router sends incorrect queries. — In named mode EIGRP, changing metric weights (k-values) does not automatically trigger a neighbor reset. Without a 'clear ip eigrp neighbors' command, the router continues to use the old k-values for existing neighbors while sending queries with the new k-values, causing a mismatch that leads to stuck-in-active (SIA) routes. Classic mode EIGRP automatically resets neighbors when metric weights change, avoiding this issue.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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