350-401 Virtual Machines and Hypervisors Practice Question
This 350-401 practice question tests your understanding of virtual machines and hypervisors. 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:
interface GigabitEthernet0/0
ip address 172.16.1.1 255.255.255.0
ipv6 address 2001:db8:1::1/64
ipv6 ospf 100 area 0
!
What is missing from this configuration to enable OSPFv3 on this interface?
The configuration is complete; no additional commands are needed.
Why wrong: Incorrect. The OSPFv3 process must be created globally with 'ipv6 router ospf 100'.
B
The command 'ipv6 router ospf 100' must be added globally to create the OSPFv3 process.
Correct. The global OSPFv3 process must be created before interface configuration will take effect.
C
The interface needs the 'ipv6 ospf network point-to-point' command to work.
Why wrong: Incorrect. While that can be used, it is not required for basic OSPFv3 operation.
D
The 'ipv6 unicast-routing' command must be enabled globally.
Why wrong: Incorrect. IPv6 unicast routing is typically enabled by default on modern IOS, but even if not, OSPFv3 can run without it, though routing would not function.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The command 'ipv6 router ospf 100' must be added globally to create the OSPFv3 process.
Option B is correct because OSPFv3 requires an active OSPFv3 process on the router before it can be enabled on any interface. The 'ipv6 router ospf 100' global command creates the OSPFv3 process with process ID 100, which is necessary for the interface-level 'ipv6 ospf 100 area 0' command to function. Without this global process, the interface configuration is incomplete and OSPFv3 will not operate.
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.
✗
The configuration is complete; no additional commands are needed.
Why it's wrong here
Incorrect. The OSPFv3 process must be created globally with 'ipv6 router ospf 100'.
✓
The command 'ipv6 router ospf 100' must be added globally to create the OSPFv3 process.
Why this is correct
Correct. The global OSPFv3 process must be created before interface configuration will take effect.
Related concept
Read the scenario before looking for a memorised answer.
✗
The interface needs the 'ipv6 ospf network point-to-point' command to work.
Why it's wrong here
Incorrect. While that can be used, it is not required for basic OSPFv3 operation.
✗
The 'ipv6 unicast-routing' command must be enabled globally.
Why it's wrong here
Incorrect. IPv6 unicast routing is typically enabled by default on modern IOS, but even if not, OSPFv3 can run without it, though routing would not function.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the requirement that an OSPFv3 process must be created globally with 'ipv6 router ospf <process-id>' before interface-level OSPFv3 commands will work, leading candidates to mistakenly think the interface configuration alone is sufficient.
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 adjacency, but the OSPFv3 process must be instantiated globally before any interface can participate. A common real-world scenario is when an engineer configures OSPFv3 on multiple interfaces but forgets the global process, resulting in no OSPFv3 adjacencies forming; the 'show ipv6 ospf interface' command will show the interface as 'DOWN' due to the missing process. Additionally, OSPFv3 uses a separate process ID from OSPFv2, so the same router can run both simultaneously.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
Virtual Machines and Hypervisors — This question tests Virtual Machines and Hypervisors — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The command 'ipv6 router ospf 100' must be added globally to create the OSPFv3 process. — Option B is correct because OSPFv3 requires an active OSPFv3 process on the router before it can be enabled on any interface. The 'ipv6 router ospf 100' global command creates the OSPFv3 process with process ID 100, which is necessary for the interface-level 'ipv6 ospf 100 area 0' command to function. Without this global process, the interface configuration is incomplete and OSPFv3 will not operate.
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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Question Discussion
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