- A
It enables OSPFv3 process 1 on this interface and assigns it to area 0.
Correct. This is the correct syntax to enable OSPFv3 on an interface and specify the area.
- B
It enables OSPFv2 process 1 on this interface and assigns it to area 0.
Why wrong: Incorrect. The 'ipv6 ospf' command is for OSPFv3, not OSPFv2. OSPFv2 uses 'ip ospf'.
- C
It enables OSPFv3 on this interface but the process ID must match the router ospf process ID; if not, it will be ignored.
Why wrong: Incorrect. The interface command uses the process ID; if the router ospf process is not configured, the command is still accepted but OSPFv3 will not run.
- D
It enables OSPFv3 on this interface but area 0 is invalid for IPv6; OSPFv3 uses area 0.0.0.0.
Why wrong: Incorrect. Area 0 is valid for OSPFv3; it is the backbone area.
Quick Answer
The answer is that the 'ipv6 ospf 1 area 0' command enables OSPFv3 process 1 on the interface and assigns it to area 0. This is correct because OSPFv3, the IPv6 version of OSPF, requires per-interface activation using this exact syntax, which directly binds the interface to a specific OSPFv3 process ID and area—unlike OSPFv2, where the network command under the router process handles interface assignment. On the ENCOR 350-401 exam, this command tests your understanding that OSPFv3 configuration is interface-centric and independent of a global router configuration; a common trap is confusing it with OSPFv2’s network statement or forgetting that the process ID must match. A helpful memory tip is to think of it as "interface-first" for IPv6: you tell the interface which OSPF process and area it belongs to, rather than telling the process which networks to include.
CCNP Network Function Virtualization Practice Question
This 350-401 practice question tests your understanding of network function virtualization. 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 this configuration:
interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0
ipv6 address 2001:db8::1/64 ipv6 ospf 1 area 0
What is the effect of the 'ipv6 ospf 1 area 0' command?
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
It enables OSPFv3 process 1 on this interface and assigns it to area 0.
The 'ipv6 ospf 1 area 0' command enables OSPFv3 (the IPv6 version of OSPF) on the specified interface, assigns it to OSPFv3 process 1, and places the interface in area 0 (the backbone area). This is the correct syntax for activating OSPFv3 on an interface under a specific process and area, independent of any global OSPFv3 process configuration.
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.
- ✓
It enables OSPFv3 process 1 on this interface and assigns it to area 0.
Why this is correct
Correct. This is the correct syntax to enable OSPFv3 on an interface and specify the area.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
It enables OSPFv2 process 1 on this interface and assigns it to area 0.
Why it's wrong here
Incorrect. The 'ipv6 ospf' command is for OSPFv3, not OSPFv2. OSPFv2 uses 'ip ospf'.
- ✗
It enables OSPFv3 on this interface but the process ID must match the router ospf process ID; if not, it will be ignored.
Why it's wrong here
Incorrect. The interface command uses the process ID; if the router ospf process is not configured, the command is still accepted but OSPFv3 will not run.
- ✗
It enables OSPFv3 on this interface but area 0 is invalid for IPv6; OSPFv3 uses area 0.0.0.0.
Why it's wrong here
Incorrect. Area 0 is valid for OSPFv3; it is the backbone area.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between OSPFv2 and OSPFv3 interface commands, and the trap here is that candidates confuse 'ip ospf' (OSPFv2) with 'ipv6 ospf' (OSPFv3) or assume the process ID must match a pre-existing global process, when in fact the interface command can auto-create the process.
Trap categories for this question
Command / output trap
Incorrect. The 'ipv6 ospf' command is for OSPFv3, not OSPFv2. OSPFv2 uses 'ip ospf'.
Detailed technical explanation
How to think about this question
OSPFv3 (defined in RFC 5340) runs directly over IPv6 and uses link-local addresses for neighbor discovery, unlike OSPFv2 which relies on IPv4. The 'ipv6 ospf' interface command can dynamically create the OSPFv3 process if it doesn't exist, making it a common method for enabling OSPFv3 without a separate 'router ospf' configuration step. In real-world deployments, this command is often used to quickly bring up OSPFv3 on point-to-point links without needing to define a router process globally first.
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
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 350-401 question test?
Network Function Virtualization — This question tests Network Function Virtualization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It enables OSPFv3 process 1 on this interface and assigns it to area 0. — The 'ipv6 ospf 1 area 0' command enables OSPFv3 (the IPv6 version of OSPF) on the specified interface, assigns it to OSPFv3 process 1, and places the interface in area 0 (the backbone area). This is the correct syntax for activating OSPFv3 on an interface under a specific process and area, independent of any global OSPFv3 process configuration.
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
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.
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