The correct answer is that OSPF will use a 10-second hello interval and suppress the DR/BDR election. This happens because the `ip ospf network point-to-point` command changes the OSPF network type from the default broadcast to point-to-point, which inherently disables the DR/BDR election process since only two routers can exist on a point-to-point link. The explicit `ip ospf hello-interval 10` command is technically redundant here because the default hello interval for a point-to-point network is already 10 seconds, but it does not conflict with the configuration. On the ENCOR 350-401 exam, this question tests your understanding of how OSPF network types affect neighbor behavior and hello timers, with a common trap being that candidates assume the explicit hello-interval command is necessary or that a DR/BDR election still occurs. A useful memory tip is “point-to-point = no election, hello stays 10,” reminding you that the network type command is the key driver, not the timer override.
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 point-to-point
ip ospf hello-interval 10
!
router ospf 1
network 192.168.1.0 0.0.0.255 area 0
OSPF will use a 10-second hello interval and suppress DR/BDR election.
Correct. The point-to-point network type eliminates DR/BDR and uses a 10-second hello interval by default; the explicit command is redundant but confirms the behavior.
B
OSPF will use a 30-second hello interval and elect a DR/BDR.
Why wrong: Incorrect. The point-to-point network type uses a 10-second hello interval, not 30, and does not elect DR/BDR.
C
OSPF will use a 10-second hello interval but still elect a DR/BDR.
Why wrong: Incorrect. Point-to-point network type disables DR/BDR election.
D
OSPF will use a 30-second hello interval and suppress DR/BDR election.
Why wrong: Incorrect. The hello interval is 10 seconds, not 30, for point-to-point.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
OSPF will use a 10-second hello interval and suppress DR/BDR election.
The configuration sets the OSPF network type to point-to-point and overrides the default hello interval (which for point-to-point is 10 seconds) to 10 seconds, which is actually the default for point-to-point. However, the key point is that the 'ip ospf network point-to-point' command changes the OSPF network type from broadcast to point-to-point, which disables DR/BDR election and uses a 10-second hello interval by default. The explicit hello-interval command is redundant but not harmful.
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 use a 10-second hello interval and suppress DR/BDR election.
Why this is correct
Correct. The point-to-point network type eliminates DR/BDR and uses a 10-second hello interval by default; the explicit command is redundant but confirms the behavior.
OSPF will use a 30-second hello interval and elect a DR/BDR.
Why it's wrong here
Incorrect. The point-to-point network type uses a 10-second hello interval, not 30, and does not elect DR/BDR.
✗
OSPF will use a 10-second hello interval but still elect a DR/BDR.
Why it's wrong here
Incorrect. Point-to-point network type disables DR/BDR election.
✗
OSPF will use a 30-second hello interval and suppress DR/BDR election.
Why it's wrong here
Incorrect. The hello interval is 10 seconds, not 30, for point-to-point.
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 use a 10-second hello interval and suppress DR/BDR election. — The configuration sets the OSPF network type to point-to-point and overrides the default hello interval (which for point-to-point is 10 seconds) to 10 seconds, which is actually the default for point-to-point. However, the key point is that the 'ip ospf network point-to-point' command changes the OSPF network type from broadcast to point-to-point, which disables DR/BDR election and uses a 10-second hello interval by default. The explicit hello-interval command is redundant but not harmful.
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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