mediumMultiple Choice
350-401 Practice Question: Interface GigabitEthernet0/0 ip address…
interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0 ip ospf network non-broadcast ip ospf priority 1
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router ospf 1 network 192.168.1.0 0.0.0.255 area 0 neighbor 192.168.1.2
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the misconception that 'non-broadcast' means 'no DR/BDR election,' but the trap here is that non-broadcast is still a multi-access network type and requires DR/BDR election, unlike point-to-point or point-to-multipoint network types.
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
✓
OSPF will form an adjacency with 192.168.1.2 and elect a DR/BDR based on priority.
The configuration sets the OSPF network type to non-broadcast on the interface, which requires manual neighbor statements (neighbor 192.168.1.2) to form adjacencies. In non-broadcast mode, OSPF uses unicast instead of multicast, but it still performs DR/BDR election because the network type is considered multi-access (like Frame Relay). The ip ospf priority 1 command influences the election, so the correct answer is that OSPF will form an adjacency with 192.168.1.2 and elect a DR/BDR based on priority.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
OSPF will form an adjacency with 192.168.1.2 and elect a DR/BDR based on priority.
Why this is correct
On a non-broadcast (NBMA) OSPF network type, the link is treated as a multi-access segment, so after the neighbor 192.168.1.2 is manually configured, OSPF forms a full adjacency and performs a DR/BDR election. The router with the highest interface priority (then highest router ID) becomes DR, and election occurs only among routers with priority greater than 0. This is correct because non-broadcast network type requires unicast neighbor configuration and still has multi-access semantics.
- ✗
OSPF will form an adjacency with 192.168.1.2 without DR/BDR election.
Why it's wrong here
Non-broadcast is a multi-access OSPF network type, and multi-access networks always use DR/BDR election to minimize flooding and full adjacencies. Since the segment can contain more than two routers, OSPF cannot simply form a single point-to-point-style adjacency without electing a DR and BDR. Thus, on a non-broadcast network with 192.168.1.2, adjacency formation is accompanied by DR/BDR election, not suppressed.
- ✗
OSPF will automatically discover neighbors via multicast and form adjacencies.
Why it's wrong here
Non-broadcast network type explicitly lacks broadcast and multicast capability, so OSPF cannot use multicast addresses 224.0.0.5 or 224.0.0.6 to discover neighbors dynamically. Instead, neighbors must be manually defined with the 'neighbor' command, and OSPF sends hello packets via unicast to those configured addresses. Automatic neighbor discovery via multicast is a property of the broadcast network type, not non-broadcast.
- ✗
OSPF will use a 30-second hello interval and suppress DR/BDR election.
Why it's wrong here
Although the non-broadcast network type does use a 30-second hello interval and a 120-second dead interval by default, the assertion that it suppresses DR/BDR election is false. DR/BDR election is a function of the network's multi-access nature, not its hello timer, and NBMA is multi-access. Therefore, OSPF on this link will still elect a DR/BDR based on priority while sending hellos every 30 seconds, making this option incorrect.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.