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300-410 Practice Question: In EIGRP, which of the following K values is…
In EIGRP, which of the following K values is disabled by default and is associated with the maximum transmission unit (MTU)?
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
✓
K5 (MTU)
By default, EIGRP uses only K1 (bandwidth) and K3 (delay) in its composite metric calculation, with K1 and K3 set to 1. K2 (load), K4 (reliability), and K5 (MTU) are set to 0, meaning they are disabled by default. This question specifically targets the K value related to MTU, which is K5. Therefore, K5 (MTU) is the correct answer.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
K5 (MTU)
Why this is correct
Correct. K5 is the K value for MTU, and it is disabled by default.
- ✗
K1 (bandwidth)
Why it's wrong here
Incorrect. K1 (bandwidth) is enabled by default and used in the metric calculation.
- ✗
K3 (delay)
Why it's wrong here
Incorrect. K3 (delay) is enabled by default and used in the metric calculation.
- ✗
K2 (load)
Why it's wrong here
Incorrect. While K2 (load) is also disabled by default, it is not the K value associated with MTU. The question specifically asks for the K value related to MTU.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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