The correct effect is that OSPF will form an adjacency with 192.168.1.2 and elect a Designated Router (DR) and Backup Designated Router (BDR) based on the configured priority of 1. This is because the `ip ospf network non-broadcast` command changes the OSPF network type to Non-Broadcast Multi-Access (NBMA), which requires explicit manual neighbor configuration via the `neighbor` command—unlike broadcast networks that use multicast Hello discovery. On the ENCOR 350-401 exam, this scenario tests your understanding of how OSPF behaves on NBMA links like Frame Relay, where DR/BDR election still occurs but neighbors must be statically defined. A common trap is assuming that setting the network type to non-broadcast disables DR/BDR election entirely; in reality, election proceeds normally, and the priority value (here set to 1) ensures the router is eligible. Memory tip: “Non-broadcast needs a neighbor list, but DR/BDR still exists.”
350-401 WAN Technologies Practice Question
This 350-401 practice question tests your understanding of wan technologies. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
interface GigabitEthernet0/0
ip address 192.168.1.1 255.255.255.0
ip ospf network non-broadcast
ip ospf priority 1
!
router ospf 1
network 192.168.1.0 0.0.0.255 area 0
neighbor 192.168.1.2
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 OSPF network type is set to non-broadcast, which requires manual neighbor configuration. The 'neighbor' command is used to specify the neighbor IP. The priority is set to 1, which allows the router to participate in DR/BDR election. This is typical for Frame Relay or other NBMA networks.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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
Correct. Non-broadcast network type requires manual neighbor configuration and uses DR/BDR election.
OSPF will form an adjacency with 192.168.1.2 without DR/BDR election.
Why it's wrong here
Incorrect. Non-broadcast network type uses DR/BDR election.
✗
OSPF will automatically discover neighbors via multicast and form adjacencies.
Why it's wrong here
Incorrect. Non-broadcast network type does not use multicast; neighbors must be configured manually.
✗
OSPF will use a 30-second hello interval and suppress DR/BDR election.
Why it's wrong here
Incorrect. Non-broadcast uses a 30-second hello interval but does not suppress DR/BDR election.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.
WAN Technologies — This question tests WAN Technologies — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: OSPF will form an adjacency with 192.168.1.2 and elect a DR/BDR based on priority. — The OSPF network type is set to non-broadcast, which requires manual neighbor configuration. The 'neighbor' command is used to specify the neighbor IP. The priority is set to 1, which allows the router to participate in DR/BDR election. This is typical for Frame Relay or other NBMA networks.
What should I do if I get this 350-401 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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