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350-401 Practice Question: Examine the following EIGRP configuration…
Examine the following EIGRP configuration snippet:
interface GigabitEthernet0/0 ip bandwidth-percent eigrp 100 50
What is the effect of this command?
⚠ Common exam trap
Cisco often tests the misconception that `ip bandwidth-percent eigrp` controls data traffic or route selection, when in fact it only limits EIGRP's own control plane bandwidth usage.
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 use up to 50% of the interface bandwidth for its control traffic.
The `ip bandwidth-percent eigrp 100 50` command configures EIGRP to use up to 50% of the interface's configured bandwidth for its control traffic (hello, update, query, and reply packets). This limits the amount of bandwidth EIGRP can consume to prevent it from starving other traffic. The percentage is applied to the interface's `bandwidth` setting, not the actual physical link speed.
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 up to 50% of the interface bandwidth for its control traffic.
Why this is correct
Correct. This command limits EIGRP's bandwidth usage to 50% of the interface's configured bandwidth.
- ✗
EIGRP will only advertise routes that have a metric within 50% of the best path.
Why it's wrong here
Incorrect. This command does not affect route selection; it only controls bandwidth usage for EIGRP packets.
- ✗
EIGRP will use 50% of the interface bandwidth for data traffic.
Why it's wrong here
Incorrect. This command specifically controls EIGRP control traffic, not data traffic.
- ✗
EIGRP will reduce its hello interval by 50%.
Why it's wrong here
Incorrect. The command does not affect hello intervals.
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.
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Last reviewed: Jun 24, 2026
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