- A
The offset-list increased the feasible distance beyond the advertised distance, making the route no longer feasible.
Correct. Offset-lists increase the FD, and if the FD exceeds the AD, the route becomes infeasible and is removed from the topology table.
- B
The offset-list is applied to the wrong interface, so it does not affect the route.
Why wrong: Incorrect. If the offset-list is applied to the wrong interface, it would not affect the route, but the route would still be installed.
- C
The BFD session is flapping, causing EIGRP to remove the route.
Why wrong: Incorrect. BFD flapping would cause EIGRP to remove all routes learned via that neighbor, not just the one with the offset-list.
- D
The offset-list is using a metric that exceeds the maximum hop count for EIGRP.
Why wrong: Incorrect. EIGRP does not have a hop count limit; it uses composite metric.
300-410 Bidirectional Forwarding Detection (BFD) Practice Question
This 300-410 practice question tests your understanding of bidirectional forwarding detection (bfd). 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 BFD for EIGRP and also applies an offset-list to increase the metric of a route. The BFD session is up, but the route with the offset-list is not being installed in the routing table. The engineer verifies that the offset-list is correctly configured. What 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 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 offset-list increased the feasible distance beyond the advertised distance, making the route no longer feasible.
EIGRP offset-lists can increase the metric of a route, but they affect the feasible distance (FD), not the advertised distance (AD). If the offset-list increases the FD such that the route is no longer feasible (i.e., the FD exceeds the AD of the successor), the route may be removed from the topology table. BFD does not interact with offset-lists.
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 offset-list increased the feasible distance beyond the advertised distance, making the route no longer feasible.
Why this is correct
Correct. Offset-lists increase the FD, and if the FD exceeds the AD, the route becomes infeasible and is removed from the topology table.
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 offset-list is applied to the wrong interface, so it does not affect the route.
Why it's wrong here
Incorrect. If the offset-list is applied to the wrong interface, it would not affect the route, but the route would still be installed.
- ✗
The BFD session is flapping, causing EIGRP to remove the route.
Why it's wrong here
Incorrect. BFD flapping would cause EIGRP to remove all routes learned via that neighbor, not just the one with the offset-list.
- ✗
The offset-list is using a metric that exceeds the maximum hop count for EIGRP.
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.
What to study next
Got this wrong? Here's your next step.
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.
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Bidirectional Forwarding Detection (BFD) — study guide chapter
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FAQ
Questions learners often ask
What does this 300-410 question test?
Bidirectional Forwarding Detection (BFD) — This question tests Bidirectional Forwarding Detection (BFD) — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The offset-list increased the feasible distance beyond the advertised distance, making the route no longer feasible. — EIGRP offset-lists can increase the metric of a route, but they affect the feasible distance (FD), not the advertised distance (AD). If the offset-list increases the FD such that the route is no longer feasible (i.e., the FD exceeds the AD of the successor), the route may be removed from the topology table. BFD does not interact with offset-lists.
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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Last reviewed: Jun 18, 2026
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