- A
OSPF adjacency will form with a neighbor using hello/dead intervals of 10/40 seconds.
The point-to-point network type with explicit hello/dead intervals of 10/40 matches the default for point-to-point, so adjacency forms normally.
- B
OSPF adjacency will not form because the hello interval is too low for point-to-point.
Why wrong: The hello interval of 10 seconds is standard for point-to-point; it is not too low.
- C
The network command under router ospf will be ignored because the interface has an explicit network type.
Why wrong: The network command is still processed; the interface configuration only overrides network type parameters, not the area assignment.
- D
OSPF will use the default broadcast network type because the point-to-point keyword is misspelled.
Why wrong: The keyword 'point-to-point' is correctly spelled; no misspelling exists.
Quick Answer
The answer is that OSPF adjacency will form with a neighbor using hello and dead intervals of 10 and 40 seconds, respectively. This is correct because the `ip ospf network point-to-point` command changes the interface’s OSPF network type from the default broadcast to point-to-point, which eliminates the need for a DR/BDR election and allows OSPF to rely solely on the configured timers. The explicit `ip ospf hello-interval 10` and `ip ospf dead-interval 40` override the default point-to-point timers, and since the `network` statement under router OSPF matches the interface subnet in area 0, OSPF will activate and attempt to form a neighbor relationship—provided the remote interface uses matching intervals. On the ENCOR 350-401 exam, this scenario tests your understanding of how OSPF network types affect adjacency formation and timer negotiation; a common trap is assuming that mismatched timers on a point-to-point link will still allow adjacency, but OSPF requires exact timer match for the dead interval (and hello interval) unless the network type is non-broadcast. Memory tip: on a point-to-point link, think “no DR, timers must match—like two friends agreeing on a meeting time.”
350-401 Enterprise Network Design Practice Question
This 350-401 practice question tests your understanding of enterprise network design. 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.
Examine the following configuration snippet:
interface GigabitEthernet0/1 ip address 192.168.1.1 255.255.255.0 ip ospf network point-to-point ip ospf hello-interval 10 ip ospf dead-interval 40
!
router ospf 1 network 192.168.1.0 0.0.0.255 area 0
What is the effect of this configuration?
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 adjacency will form with a neighbor using hello/dead intervals of 10/40 seconds.
The configuration sets the OSPF network type to point-to-point on the interface, which allows OSPF to form an adjacency with a neighbor using the configured hello interval of 10 seconds and dead interval of 40 seconds. These intervals are valid for point-to-point networks, and the network command under router ospf correctly enables OSPF on the interface. Therefore, an adjacency will form as long as the neighbor's intervals match.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 adjacency will form with a neighbor using hello/dead intervals of 10/40 seconds.
Why this is correct
The point-to-point network type with explicit hello/dead intervals of 10/40 matches the default for point-to-point, so adjacency forms normally.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
OSPF adjacency will not form because the hello interval is too low for point-to-point.
Why it's wrong here
The hello interval of 10 seconds is standard for point-to-point; it is not too low.
- ✗
The network command under router ospf will be ignored because the interface has an explicit network type.
Why it's wrong here
The network command is still processed; the interface configuration only overrides network type parameters, not the area assignment.
- ✗
OSPF will use the default broadcast network type because the point-to-point keyword is misspelled.
Why it's wrong here
The keyword 'point-to-point' is correctly spelled; no misspelling exists.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that the network command is ignored when an explicit ip ospf network type is configured, but in reality both work together—the network command enables OSPF on the interface, and the ip ospf network command only changes the OSPF network type.
Trap categories for this question
Keyword trap
The keyword 'point-to-point' is correctly spelled; no misspelling exists.
Command / output trap
The network command is still processed; the interface configuration only overrides network type parameters, not the area assignment.
Detailed technical explanation
How to think about this question
OSPF network types affect hello/dead interval defaults and adjacency behavior; point-to-point eliminates the need for DR/BDR election and uses multicast 224.0.0.5 for all OSPF packets. The network command under router ospf uses wildcard matching to enable OSPF on interfaces, but the ip ospf network command on the interface overrides the default network type derived from the underlying media (e.g., broadcast for Ethernet). In real-world scenarios, mismatched hello/dead intervals or network types (e.g., point-to-point vs. broadcast) will prevent adjacency formation, so consistency is critical.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
What to study next
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FAQ
Questions learners often ask
What does this 350-401 question test?
Enterprise Network Design — This question tests Enterprise Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: OSPF adjacency will form with a neighbor using hello/dead intervals of 10/40 seconds. — The configuration sets the OSPF network type to point-to-point on the interface, which allows OSPF to form an adjacency with a neighbor using the configured hello interval of 10 seconds and dead interval of 40 seconds. These intervals are valid for point-to-point networks, and the network command under router ospf correctly enables OSPF on the interface. Therefore, an adjacency will form as long as the neighbor's intervals match.
What should I do if I get this 350-401 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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