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300-410 Practice Question: Is the default EIGRP network type on a Frame…
Which of the following is the default EIGRP network type on a Frame Relay point-to-point subinterface?
⚠ Common exam trap
Cisco often tests the misconception that Frame Relay always defaults to NBMA, but candidates must remember that point-to-point subinterfaces override this default to point-to-point, while only physical interfaces or multipoint subinterfaces retain the NBMA default.
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
✓
Point-to-point
On a Frame Relay point-to-point subinterface, the default EIGRP network type is point-to-point. This is because each point-to-point subinterface creates a separate logical connection to a single remote router, eliminating the need for NBMA-specific mechanisms like split horizon or next-hop-self adjustments. The point-to-point network type enables EIGRP to use multicast hello packets (224.0.0.10) and form a single adjacency over the link.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NBMA
Why it's wrong here
Incorrect. NBMA is the default for multipoint interfaces, not point-to-point subinterfaces.
- ✓
Point-to-point
Why this is correct
Correct. Point-to-point subinterfaces default to point-to-point network type.
- ✗
Broadcast
Why it's wrong here
Incorrect. Broadcast is used on Ethernet or when manually configured.
- ✗
Point-to-multipoint
Why it's wrong here
Incorrect. This is not a default EIGRP network type for point-to-point subinterfaces.
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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Senior Network & Security Engineer · founder of Courseiva
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