Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
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?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Convert the AP uplink to an access port in VLAN 40 and leave the AP to handle all traffic untagged.
An access port cannot properly carry the multiple VLANs typically needed for an access point and management traffic.
B
Best answer
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
Distractor review
Add the internal printer VLAN to the allowed list so the AP can filter client traffic itself.
Allowing the internal VLAN to traverse the uplink expands exposure rather than fixing the segmentation problem.
D
Distractor review
Keep the trunk settings and add a layer 3 ACL between the guest and internal networks.
Layer 3 ACLs do not address a bad trunk configuration or prevent unexpected VLAN exposure at the switch layer.
Common exam trap
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Technical deep dive
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A laptop is suspected of being used in a malware incident. It is still powered on and connected to Wi-Fi. What should the responder do before shutting it down?
Question 2
An employee reports a ransomware note on a file server. The server is still powered on, shares are still being accessed, and management wants service restored as quickly as possible. What should the incident response team do first?
Question 3
An employee reports a ransomware note on a finance laptop. The laptop is still powered on, connected to Wi-Fi, and the user says they were just working in a spreadsheet. Management wants the fastest safe response that also preserves evidence. What should the responder do first?
Question 4
You are handed a company laptop suspected in an insider theft case. Legal says the evidence may be needed in court. Which action best preserves admissibility?
Question 5
A developer wants to reduce the risk of SQL injection in a new customer search form. Which two changes are the best mitigations? Select two.
Question 6
A branch office uses a flat LAN, and a compromise on one user workstation could spread quickly to finance systems. Management wants finance workstations isolated from general users, but finance staff still need access to a central finance application and network printer. What is the best design change?
FAQ
Questions learners often ask
What does this SY0-701 question test?
Access ports place end devices into a single VLAN.
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 best fix is to disable dynamic trunk negotiation, explicitly define the trunk, and allow only the VLANs the AP truly needs. Putting the native VLAN on an unused value reduces the chance of unintended traffic leakage through VLAN 1. This approach addresses the wiring-closet-specific problem at the Layer 2 boundary, which is where the exposure is occurring. It is more effective than trying to filter later with routing ACLs. Why others are wrong: Turning the uplink into an access port usually breaks multi-VLAN AP operation and is not a realistic fix for managed wireless. Adding the internal printer VLAN to the trunk makes the exposure worse, not better. A Layer 3 ACL can help after routing occurs, but it cannot correct a misconfigured trunk or stop traffic from being placed on the wrong VLAN in the first place.
What should I do if I get this SY0-701 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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