- A
EIGRP will use only 50% of the interface bandwidth for data traffic.
Why wrong: This command limits EIGRP's own bandwidth usage, not data traffic.
- B
EIGRP will limit its control traffic to 50% of the interface bandwidth.
The ip bandwidth-percent eigrp command restricts the percentage of bandwidth EIGRP can use for its protocol traffic.
- C
EIGRP will adjust the metric calculation to use 50% of the bandwidth.
Why wrong: This command does not affect metric calculations; it only limits bandwidth usage.
- D
EIGRP will form neighbor adjacencies only when bandwidth usage is below 50%.
Why wrong: The command does not control adjacency formation based on bandwidth usage.
Question 689 of 2,152
300-410 EIGRP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of eigrp troubleshooting. 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.
Examine the following EIGRP configuration on Router R3:
interface GigabitEthernet0/1 ip bandwidth-percent eigrp 100 50
What is the effect of this command?
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
✓
EIGRP will limit its control traffic to 50% of the interface bandwidth.
The `ip bandwidth-percent eigrp` command controls the percentage of the interface bandwidth that EIGRP can use for its control traffic (hello packets, updates, queries, and replies). By setting it to 50%, EIGRP will limit its control traffic to 50% of the configured interface bandwidth, preventing it from overwhelming the link. This does not affect data traffic or metric calculation.
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.
- ✗
EIGRP will use only 50% of the interface bandwidth for data traffic.
Why it's wrong here
This command limits EIGRP's own bandwidth usage, not data traffic.
- ✓
EIGRP will limit its control traffic to 50% of the interface bandwidth.
Why this is correct
The ip bandwidth-percent eigrp command restricts the percentage of bandwidth EIGRP can use for its protocol traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
EIGRP will adjust the metric calculation to use 50% of the bandwidth.
Why it's wrong here
This command does not affect metric calculations; it only limits bandwidth usage.
- ✗
EIGRP will form neighbor adjacencies only when bandwidth usage is below 50%.
Why it's wrong here
The command does not control adjacency formation based on bandwidth usage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing the `ip bandwidth-percent eigrp` command (which limits EIGRP control traffic) with the `bandwidth` command (which sets the metric value and is used for QoS calculations), leading candidates to incorrectly think it adjusts metrics or data traffic limits.
Trap categories for this question
Command / output trap
This command limits EIGRP's own bandwidth usage, not data traffic.
Detailed technical explanation
How to think about this question
Under the hood, EIGRP uses a token bucket mechanism to rate-limit its control packets to the specified percentage of the interface bandwidth (default is 50% if not configured). This is critical in WAN environments with low-bandwidth links (e.g., fractional T1) where EIGRP updates could otherwise saturate the link and cause packet loss for user traffic. The command does not affect the `bandwidth` parameter used in the composite metric, which is separately configured or inherited.
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.
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
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FAQ
Questions learners often ask
What does this 300-410 question test?
EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: EIGRP will limit its control traffic to 50% of the interface bandwidth. — The `ip bandwidth-percent eigrp` command controls the percentage of the interface bandwidth that EIGRP can use for its control traffic (hello packets, updates, queries, and replies). By setting it to 50%, EIGRP will limit its control traffic to 50% of the configured interface bandwidth, preventing it from overwhelming the link. This does not affect data traffic or metric calculation.
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: Jul 4, 2026
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