The answer is that the centralized data policy is missing a match condition for the correct VPN or site list. In Cisco SD-WAN, a centralized data policy must explicitly define both the VPN (service-side VRF) and the site list to which the policy applies; without these match conditions, the vEdge router receives the policy as active but cannot bind it to the specific traffic flows, causing the traffic to bypass the policy and follow the default routing path, such as MPLS. This scenario tests your understanding of how centralized data policy troubleshooting often hinges on scope—a common trap on the ENCOR 350-401 exam is assuming that matching destination IP alone is sufficient, when in reality the policy must be scoped to the correct VPN and site list to steer traffic. Remember the mnemonic “VPN and Site, the policy’s delight”—without both, your traffic steering will fail.
350-401 SD-WAN Architecture Practice Question
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 retail chain with hundreds of stores. The engineer wants to use a centralized data policy to steer all YouTube traffic to a specific WAN link (broadband) to save MPLS bandwidth. The engineer creates a policy that matches YouTube traffic by destination IP and sets the preferred color to 'biz-internet'. After applying the policy, the engineer tests and finds that YouTube traffic is still using the MPLS 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 does not include a match condition for the correct VPN or site list.
Option C is correct because a centralized data policy in Cisco SD-WAN must include match conditions for both the VPN (service-side VRF) and the site list to which the policy applies. Without specifying the correct VPN or site list, the policy may be received and active on the vEdge but will not match the traffic flows, causing them to fall through to the default routing behavior (e.g., MPLS). The policy matches destination IPs, but if the VPN or site scope is missing or incorrect, the vEdge will not apply the policy to the relevant traffic.
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 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 policy does not include a match condition for the correct VPN or site list.
Why this is correct
Correct because the policy must be associated with the specific VPN and site list to apply to the traffic.
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.
✗
YouTube traffic is encrypted and cannot be matched by destination IP.
Why it's wrong here
Incorrect because YouTube traffic can be matched by destination IP even if encrypted.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a data policy only needs a destination IP match to steer traffic, but the trap here is that the policy must also specify the correct VPN (or service-side VRF) and site list to scope the policy to the intended traffic flows.
Detailed technical explanation
How to think about this question
In Cisco SD-WAN, centralized data policies are defined on vSmart and pushed to vEdge routers via OMP route updates. The policy must include a match condition for the VPN (e.g., VPN 10 for guest traffic) and optionally a site list to restrict the policy to specific branch sites. If the VPN is not specified, the policy defaults to matching all VPNs, but if the traffic originates from a VPN not included in the policy definition (e.g., a corporate VPN), the policy will not be applied. Additionally, the policy uses a sequence of match-action rules; without the correct VPN match, the traffic is evaluated against the default route, which may prefer MPLS due to higher OMP administrative distance or TLOC preferences.
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 does not include a match condition for the correct VPN or site list. — Option C is correct because a centralized data policy in Cisco SD-WAN must include match conditions for both the VPN (service-side VRF) and the site list to which the policy applies. Without specifying the correct VPN or site list, the policy may be received and active on the vEdge but will not match the traffic flows, causing them to fall through to the default routing behavior (e.g., MPLS). The policy matches destination IPs, but if the VPN or site scope is missing or incorrect, the vEdge will not apply the policy to the relevant traffic.
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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