Question 58 of 1,840
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350-401 Practice Question: The default EIGRP hello interval on a…
What is the default EIGRP hello interval on a point-to-point serial link?
⚠ Common exam trap
Cisco often tests the distinction between EIGRP and OSPF hello intervals, so the trap here is that candidates confuse the 10-second OSPF default with EIGRP's 5-second default on point-to-point links.
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
✓
5 seconds
The default EIGRP hello interval on a point-to-point serial link is 5 seconds. EIGRP uses different hello intervals depending on the media type: for high-speed broadcast links (e.g., Ethernet) and point-to-point links, the default is 5 seconds; for multipoint non-broadcast links (e.g., Frame Relay), the default is 60 seconds.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
5 seconds
Why this is correct
Correct. The default hello interval for point-to-point serial links is 5 seconds.
- ✗
10 seconds
Why it's wrong here
Incorrect. 10 seconds is the default for OSPF on broadcast links, not EIGRP.
- ✗
30 seconds
Why it's wrong here
Incorrect. 30 seconds is not a standard EIGRP hello interval.
- ✗
60 seconds
Why it's wrong here
Incorrect. 60 seconds is the default for low-speed NBMA interfaces, not point-to-point serial.
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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