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350-401 Practice Question: Which two statements about OSPF network types are…
Which two statements about OSPF network types are true? (Choose two.)
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
✓
The point-to-point network type does not require a DR/BDR election.
The point-to-point network type does not require a DR/BDR election. Option B is correct because the broadcast network type uses a DR/BDR to reduce adjacencies and LSAs. Option C is incorrect because NBMA networks require manual neighbor configuration. Option D is incorrect because the point-to-multipoint network type does not require a DR/BDR. Option E is incorrect because the loopback interface defaults to the loopback network type, not point-to-point.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The point-to-point network type does not require a DR/BDR election.
Why this is correct
Correct because in point-to-point networks, there are only two routers, so no DR/BDR is needed.
- ✓
The broadcast network type uses a DR/BDR to reduce the number of adjacencies.
Why this is correct
Correct because on broadcast multiaccess networks, a DR/BDR is elected to minimize adjacency formation and LSA flooding.
- ✗
The NBMA network type automatically discovers neighbors via hello packets.
Why it's wrong here
Incorrect because NBMA networks require manual neighbor configuration; they do not support dynamic neighbor discovery.
- ✗
The point-to-multipoint network type requires a DR/BDR election.
Why it's wrong here
Incorrect because point-to-multipoint treats each link as a point-to-point link and does not use DR/BDR.
- ✗
The loopback interface defaults to the point-to-point network type.
Why it's wrong here
Incorrect because the loopback interface defaults to the loopback network type, which is treated as a stub host.
Visual reference
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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Same concept, more angles
1 more way this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which two statements about OSPF network types are true? (Choose two.)
medium- ✓ A.On a broadcast multiaccess network, OSPF elects a DR and BDR to reduce LSA flooding.
- B.The OSPF point-to-point network type requires a DR/BDR election.
- ✓ C.On a non-broadcast multiaccess (NBMA) network, OSPF can use the neighbor command to manually discover neighbors.
- D.The OSPF point-to-multipoint network type always elects a DR.
- E.The default OSPF network type for a loopback interface is point-to-point.
Why A: OSPF network types control how adjacencies are formed and how LSAs are flooded. Broadcast and non-broadcast types require a DR/BDR election, while point-to-point and point-to-multipoint do not. The loopback interface defaults to loopback network type, not point-to-point.
Last reviewed: Jun 18, 2026
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