- A
The policy matches routes with prefix 10.0.0.0/24 and sets the community value 100:10 on those routes before advertising them via OMP.
This correctly describes the effect: the control policy matches the prefix and sets the community on accepted routes.
- B
The policy matches routes with prefix 10.0.0.0/24 and sets the community 100:10 on the local router's routing table.
Why wrong: Control policies in SD-WAN affect OMP route advertisement, not the local routing table directly.
- C
The policy denies all routes except 10.0.0.0/24 and sets community 100:10.
Why wrong: The policy explicitly accepts the matched route; it does not deny other routes by default. The default action in a control policy is to accept, unless a default action is specified.
- D
The policy is invalid because prefix-list names cannot contain underscores.
Why wrong: Underscores are allowed in prefix-list names in SD-WAN policy configuration.
Quick Answer
The correct answer is that this SD-WAN control policy matches routes with prefix 10.0.0.0/24 and sets the community value 100:10 on those routes before advertising them via OMP. This is because the control policy sequence 10 uses a match condition referencing prefix-list PL_10, which defines the exact prefix 10.0.0.0/24; when a route matches, the action accept permits the route and the set community command modifies the OMP route attribute by appending the community 100:10. On the ENCOR 350-401 exam, this tests your understanding of how SD-WAN control policies manipulate overlay route attributes at the vSmart controller, often appearing in a scenario where you must distinguish between match-and-set operations versus simple permit or deny actions. A common trap is confusing control policies (which affect OMP routes) with data policies (which affect traffic forwarding), so remember that set community here only impacts the route’s propagation within the overlay fabric. Memory tip: think of “match the prefix, set the stamp” — the community is like a stamp you attach to the route’s OMP advertisement.
350-401 SD-WAN Architecture Practice Question
This 350-401 practice question tests your understanding of sd-wan architecture. 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 SD-WAN policy configuration on a Cisco vSmart controller:
policy control-policy CONTROL_POLICY sequence 10 match route prefix-list PL_10 action accept set community 100:10 ! prefix-list PL_10 sequence 10 match ip-address 10.0.0.0/24 !
What is the effect of this control policy?
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
The policy matches routes with prefix 10.0.0.0/24 and sets the community value 100:10 on those routes before advertising them via OMP.
This control policy matches OMP routes that have the prefix 10.0.0.0/24 (as defined by the prefix-list PL_10) and, upon a match, sets the community value 100:10 on those routes. The action 'accept' means the route is permitted and the 'set community' modifies the route's attributes before it is advertised via OMP to other vSmart or vEdge devices. This is a standard SD-WAN control policy operation for manipulating route attributes within the overlay.
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 policy matches routes with prefix 10.0.0.0/24 and sets the community value 100:10 on those routes before advertising them via OMP.
Why this is correct
This correctly describes the effect: the control policy matches the prefix and sets the community on accepted routes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The policy matches routes with prefix 10.0.0.0/24 and sets the community 100:10 on the local router's routing table.
Why it's wrong here
Control policies in SD-WAN affect OMP route advertisement, not the local routing table directly.
- ✗
The policy denies all routes except 10.0.0.0/24 and sets community 100:10.
Why it's wrong here
The policy explicitly accepts the matched route; it does not deny other routes by default. The default action in a control policy is to accept, unless a default action is specified.
- ✗
The policy is invalid because prefix-list names cannot contain underscores.
Why it's wrong here
Underscores are allowed in prefix-list names in SD-WAN policy configuration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between OMP route manipulation and local RIB changes, leading candidates to incorrectly assume that 'set community' modifies the local routing table instead of the OMP advertisement.
Detailed technical explanation
How to think about this question
In Cisco SD-WAN, control policies are applied on the vSmart controller to influence OMP route propagation and attributes. The 'match route' clause matches OMP routes based on prefix-lists, and the 'set community' action modifies the OMP community attribute, which can be used for route filtering or path selection in the overlay. This is analogous to BGP community manipulation but operates within the OMP protocol (RFC 4271-like behavior for SD-WAN). A real-world scenario is tagging routes from a specific branch with a community to influence hub-and-spoke or full-mesh topology decisions.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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FAQ
Questions learners often ask
What does this 350-401 question test?
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 matches routes with prefix 10.0.0.0/24 and sets the community value 100:10 on those routes before advertising them via OMP. — This control policy matches OMP routes that have the prefix 10.0.0.0/24 (as defined by the prefix-list PL_10) and, upon a match, sets the community value 100:10 on those routes. The action 'accept' means the route is permitted and the 'set community' modifies the route's attributes before it is advertised via OMP to other vSmart or vEdge devices. This is a standard SD-WAN control policy operation for manipulating route attributes within the overlay.
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
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