- A
Convert the AP uplink to an access port in VLAN 40 and leave the AP to handle all traffic untagged.
Why wrong: An access port cannot properly carry the multiple VLANs typically needed for an access point and management traffic.
- B
Disable dynamic trunk negotiation, configure a static trunk, allow only VLANs 40 and 99, and move the native VLAN to an unused value.
This prevents unintended trunk formation, limits the VLANs that can traverse the link, and reduces risk from the native VLAN.
- C
Add the internal printer VLAN to the allowed list so the AP can filter client traffic itself.
Why wrong: Allowing the internal VLAN to traverse the uplink expands exposure rather than fixing the segmentation problem.
- D
Keep the trunk settings and add a layer 3 ACL between the guest and internal networks.
Why wrong: Layer 3 ACLs do not address a bad trunk configuration or prevent unexpected VLAN exposure at the switch layer.
Quick Answer
The answer is to disable dynamic trunk negotiation, configure a static trunk, allow only VLANs 40 and 99, and move the native VLAN to an unused value. This fixes the guest VLAN leakage because the original trunk allowed VLANs 10, 20, and 30 but not guest VLAN 40, so guest frames were being sent untagged on the native VLAN 1, which could then be inadvertently forwarded to internal segments like the printer VLAN. On the Security+ SY0-701 exam, this scenario tests your understanding of VLAN trunk security and native VLAN risks, often appearing as a question about guest isolation or VLAN hopping. A common trap is assuming that simply adding VLAN 40 to the allowed list is enough, but the real issue is that the native VLAN (default 1) can leak untagged traffic across the trunk. Remember the mnemonic: “No DTP, only guest and management, native to the void” to lock down guest isolation.
SY0-701 Security Architecture Practice Question
This SY0-701 practice question tests your understanding of security architecture. 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 access point connected to a switch suddenly lets guest Wi-Fi users reach an internal printer VLAN, but only on the new wiring closet. The AP uplink is configured as a trunk with dynamic negotiation enabled, native VLAN 1, and allowed VLANs 10, 20, and 30. Guest traffic should be VLAN 40 and must not transit to internal segments. Which change best fixes the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Disable dynamic trunk negotiation, configure a static trunk, allow only VLANs 40 and 99, and move the native VLAN to an unused value.
The issue is that guest traffic (VLAN 40) is not in the allowed list, so the trunk is dropping it; however, the native VLAN 1 is being used for management and may leak traffic. By disabling dynamic trunk negotiation (DTP), configuring a static trunk, allowing only VLANs 40 and 99 (a management VLAN), and changing the native VLAN to an unused value, you ensure guest traffic is properly tagged and isolated from internal VLANs. This prevents the guest VLAN from being inadvertently trunked to internal segments and eliminates the risk of VLAN hopping via the native VLAN.
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.
- ✗
Convert the AP uplink to an access port in VLAN 40 and leave the AP to handle all traffic untagged.
Why it's wrong here
An access port cannot properly carry the multiple VLANs typically needed for an access point and management traffic.
- ✓
Disable dynamic trunk negotiation, configure a static trunk, allow only VLANs 40 and 99, and move the native VLAN to an unused value.
Why this is correct
This prevents unintended trunk formation, limits the VLANs that can traverse the link, and reduces risk from the native VLAN.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Add the internal printer VLAN to the allowed list so the AP can filter client traffic itself.
Why it's wrong here
Allowing the internal VLAN to traverse the uplink expands exposure rather than fixing the segmentation problem.
- ✗
Keep the trunk settings and add a layer 3 ACL between the guest and internal networks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates think adding an ACL or allowing more VLANs will solve the problem, but the root cause is that VLAN 40 is not allowed on the trunk, and the native VLAN 1 introduces a security risk; the correct fix is to explicitly permit only the necessary VLANs and secure the native VLAN.
Detailed technical explanation
How to think about this question
Dynamic Trunking Protocol (DTP) can cause a switch port to automatically negotiate trunking, potentially allowing unauthorized VLANs if the AP or switch misbehaves. By setting a static trunk and restricting allowed VLANs to only those needed (e.g., 40 for guest, 99 for management), you enforce strict VLAN segmentation. Changing the native VLAN to an unused ID (e.g., 999) prevents VLAN hopping attacks where an attacker on the native VLAN could double-tag frames to reach other VLANs (IEEE 802.1Q double-tagging attack).
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 analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this SY0-701 question test?
Security Architecture — This question tests Security Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Disable dynamic trunk negotiation, configure a static trunk, allow only VLANs 40 and 99, and move the native VLAN to an unused value. — The issue is that guest traffic (VLAN 40) is not in the allowed list, so the trunk is dropping it; however, the native VLAN 1 is being used for management and may leak traffic. By disabling dynamic trunk negotiation (DTP), configuring a static trunk, allowing only VLANs 40 and 99 (a management VLAN), and changing the native VLAN to an unused value, you ensure guest traffic is properly tagged and isolated from internal VLANs. This prevents the guest VLAN from being inadvertently trunked to internal segments and eliminates the risk of VLAN hopping via the native VLAN.
What should I do if I get this SY0-701 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
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