The correct answer is to connect the vRouter to a data plane interface, such as a bridge connected to a physical data port, instead of the management port. This is necessary because the NFVIS management port is isolated from the data plane and strictly reserved for out-of-band management traffic; it lacks the data-plane forwarding capabilities required to establish routing protocol adjacencies like OSPF or BGP. On the ENCOR 350-401 exam, this scenario tests your understanding of NFVIS architecture and the separation between management and data plane interfaces—a common trap is assuming the management port can handle routing updates since it shares a subnet. Remember that in NFVIS, the management port is for host access only, not for route exchange. A useful memory tip: “Management is for managing, not for routing.”
350-401 Network Function Virtualization Practice Question
This 350-401 practice question tests your understanding of network function virtualization. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An engineer is deploying a virtual router (vRouter) on a Cisco NFVIS host. The vRouter needs to advertise routes to a physical router connected to the host's management port. The engineer configures the vRouter with an IP address on the same subnet as the management port. However, the physical router does not receive any routing updates. What should the engineer do to enable route exchange?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Connect the vRouter to a data plane interface (e.g., a bridge connected to a physical data port) instead of the management port.
Option D is correct because in Cisco NFVIS, the management port is isolated from the data plane and is intended only for out-of-band management traffic. Routing protocols like OSPF or BGP cannot exchange routes over the management interface because it lacks the necessary data-plane forwarding capabilities. To advertise routes to a physical router, the vRouter must be connected to a data plane interface, such as a bridge mapped to a physical data port, which supports routing protocol adjacency and packet forwarding.
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.
✗
Configure a static route on the vRouter pointing to the physical router.
Why it's wrong here
Incorrect because static routes do not enable route exchange; the issue is the interface used.
✗
Enable OSPF on the vRouter's management interface.
Why it's wrong here
Incorrect because the management interface is not suitable for data plane routing protocols.
✗
Change the management port to a trunk port to carry routing updates.
Why it's wrong here
Incorrect because the management port is a dedicated management interface, not a trunk port.
✓
Connect the vRouter to a data plane interface (e.g., a bridge connected to a physical data port) instead of the management port.
Why this is correct
Correct because routing protocols should run over data plane interfaces, not the management port.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that the management port can be used for data-plane functions like routing protocol exchange, when in fact NFVIS strictly isolates management traffic to a separate bridge that does not support Layer 3 routing adjacencies.
Detailed technical explanation
How to think about this question
NFVIS separates management and data plane traffic using distinct virtual switches and bridges. The management port is connected to the NFVIS management bridge, which only handles SSH, HTTPS, and other out-of-band traffic. Data plane interfaces, such as those attached to a Linux bridge or SR-IOV VF, are required for routing protocols because they provide direct access to the physical network and support multicast (e.g., OSPF hello packets) and Layer 2 adjacency. In production, vRouters like Cisco CSR 1000v or ASAv must be attached to a data plane interface (e.g., GigabitEthernet1 mapped to a physical port) to establish routing adjacencies with external routers.
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.
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: Connect the vRouter to a data plane interface (e.g., a bridge connected to a physical data port) instead of the management port. — Option D is correct because in Cisco NFVIS, the management port is isolated from the data plane and is intended only for out-of-band management traffic. Routing protocols like OSPF or BGP cannot exchange routes over the management interface because it lacks the necessary data-plane forwarding capabilities. To advertise routes to a physical router, the vRouter must be connected to a data plane interface, such as a bridge mapped to a physical data port, which supports routing protocol adjacency and packet forwarding.
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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