This 350-401 practice question tests your understanding of sd-wan architecture. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
A network engineer is configuring a Cisco SD-WAN solution for a multinational corporation. The engineer wants to use a centralized data policy to steer all traffic from the Finance department (VPN 10) to a specific WAN link (MPLS) for security reasons. The engineer creates a policy that matches traffic from VPN 10 and sets the preferred color to 'mpls'. After applying the policy, the engineer tests and finds that traffic from VPN 10 is still using the Internet link. The vEdge routers show that the policy is received and active. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The policy is not attached to the correct site list or VPN list.
The most likely reason is that the centralized data policy was not attached to the correct site list or VPN list. In Cisco SD-WAN, a centralized data policy must be explicitly associated with the sites (via site list) and VPNs (via VPN list) where it should be applied. Even if the policy is received and active on the vEdge routers, without proper attachment to the VPN 10 site list, the policy will not enforce the preferred color 'mpls' for Finance traffic, leaving it to use the default Internet link.
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 vEdge routers have not rebooted after the policy was applied.
Why it's wrong here
Incorrect because policy changes take effect immediately without reboot.
✓
The policy is not attached to the correct site list or VPN list.
Why this is correct
Correct because the policy must be associated with the specific site and VPN to be applied.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The data policy was applied on the vEdge instead of the vSmart.
Why it's wrong here
Incorrect because the engineer stated the policy was applied on the vSmart.
✗
The preferred color is not configured correctly in the policy.
Why it's wrong here
Incorrect because the engineer configured the preferred color, but the policy is not being applied due to missing attachment.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between policy definition and policy attachment, where candidates assume that simply creating and applying a policy globally is sufficient, but the policy must be explicitly linked to the correct site list and VPN list to take effect.
Detailed technical explanation
How to think about this question
Centralized data policies in Cisco SD-WAN use a match-action framework where the 'match' clause specifies conditions like VPN, source/destination IP, or application, and the 'action' clause sets parameters like preferred color or direct Internet access. The policy must be attached to a site list and VPN list via the 'apply-policy' CLI or vManage configuration; without this attachment, the policy is defined but not enforced on the target sites. In real-world deployments, misattached policies are a common cause of traffic not being steered as intended, often leading to security or performance issues.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
SD-WAN Architecture — This question tests SD-WAN Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The policy is not attached to the correct site list or VPN list. — The most likely reason is that the centralized data policy was not attached to the correct site list or VPN list. In Cisco SD-WAN, a centralized data policy must be explicitly associated with the sites (via site list) and VPNs (via VPN list) where it should be applied. Even if the policy is received and active on the vEdge routers, without proper attachment to the VPN 10 site list, the policy will not enforce the preferred color 'mpls' for Finance traffic, leaving it to use the default Internet link.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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