The correct answer is to assign the guest SSID to a different VLAN. This works because a VLAN, or Virtual Local Area Network, logically segments traffic on the same physical switch or router, creating isolated broadcast domains. By placing the guest Wi-Fi network on its own VLAN, all guest traffic is separated from the corporate network at Layer 2, preventing unauthorized access to sensitive data even though both networks share the same hardware. On the CompTIA A+ Core 1 220-1201 exam, this concept tests your understanding of network segmentation and wireless configuration; a common trap is assuming that a different SSID name alone provides security, but SSIDs are just identifiers and do not enforce isolation. Another trap is thinking that disabling DHCP on the guest network would help, but that would break connectivity entirely. Remember the memory tip: “VLANs are the walls; SSIDs are just the doors.”
220-1201 Wireless Networking Technologies Practice Question
This 220-1201 practice question tests your understanding of wireless networking technologies. 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.
A small business owner wants to set up a guest Wi-Fi network that is isolated from the main corporate network to prevent unauthorized access to sensitive data. The wireless router supports multiple SSIDs. Which configuration should be applied to achieve this isolation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Assign the guest SSID to a different VLAN
VLANs logically separate traffic on the same physical network, so a guest VLAN on a separate SSID isolates guest traffic from the corporate network. Simply using a different SSID name or encryption does not provide isolation. Disabling DHCP would break connectivity.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Assign the guest SSID to a different VLAN
Why this is correct
A VLAN separates traffic at Layer 2, ensuring guest devices cannot reach the corporate network even though they share the same access point.
Related concept
Access ports place end devices into a single VLAN.
✗
Use a different SSID name for guests
Why it's wrong here
A different SSID alone does not isolate traffic; both SSIDs could still be on the same broadcast domain.
✗
Enable WPA2 encryption on the guest network
Why it's wrong here
Encryption secures the wireless link but does not separate guest traffic from the corporate network.
✗
Disable DHCP on the guest SSID
Why it's wrong here
Disabling DHCP would prevent guests from obtaining IP addresses, breaking network access entirely.
Common exam traps
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.
Detailed technical explanation
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.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 220-1201 questions on switching, trunking, and access-port configuration.
Wireless Networking Technologies — This question tests Wireless Networking Technologies — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Assign the guest SSID to a different VLAN — VLANs logically separate traffic on the same physical network, so a guest VLAN on a separate SSID isolates guest traffic from the corporate network. Simply using a different SSID name or encryption does not provide isolation. Disabling DHCP would break connectivity.
What should I do if I get this 220-1201 question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 220-1201 questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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