- A
Assign the guest SSID to a different VLAN
A VLAN separates traffic at Layer 2, ensuring guest devices cannot reach the corporate network even though they share the same access point.
- B
Use a different SSID name for guests
Why wrong: A different SSID alone does not isolate traffic; both SSIDs could still be on the same broadcast domain.
- C
Enable WPA2 encryption on the guest network
Why wrong: Encryption secures the wireless link but does not separate guest traffic from the corporate network.
- D
Disable DHCP on the guest SSID
Why wrong: Disabling DHCP would prevent guests from obtaining IP addresses, breaking network access entirely.
Question 176 of 1,020
Guest Wi-Fi Isolation: How to Use VLANs to Separate Traffic
This 220-1201 practice question tests your understanding of wireless networking technologies. 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.
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?
Quick Answer
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.”
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
✓
Assign the guest SSID to a different VLAN
Assigning the guest SSID to a different VLAN (Virtual Local Area Network) creates a logical separation between the guest traffic and the corporate network. VLANs operate at Layer 2, and by placing the guest SSID on a separate VLAN, the router can apply inter-VLAN ACLs or disable routing between VLANs entirely, ensuring that guest devices cannot access corporate resources. This is the standard method for network isolation in multi-SSID environments.
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.
- ✓
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
Read the scenario before looking for a memorised answer.
- ✗
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: answer the scenario, not the keyword
The trap here is that candidates confuse 'different SSID name' with actual network isolation, assuming a separate name alone creates a separate broadcast domain, when in fact VLAN assignment is required for Layer 2 separation.
Detailed technical explanation
How to think about this question
Under the hood, the wireless router maps each SSID to a specific VLAN ID (e.g., VLAN 10 for corporate, VLAN 20 for guests). The router’s switch ports and virtual interfaces are configured with 802.1Q trunking or access VLAN assignments, and inter-VLAN routing is either disabled or restricted by ACLs. In a real-world deployment, this is often combined with a captive portal and bandwidth throttling to further secure and manage guest access.
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 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.
Visual reference
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Wireless Networking Technologies — This question tests Wireless Networking Technologies — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Assign the guest SSID to a different VLAN — Assigning the guest SSID to a different VLAN (Virtual Local Area Network) creates a logical separation between the guest traffic and the corporate network. VLANs operate at Layer 2, and by placing the guest SSID on a separate VLAN, the router can apply inter-VLAN ACLs or disable routing between VLANs entirely, ensuring that guest devices cannot access corporate resources. This is the standard method for network isolation in multi-SSID environments.
What should I do if I get this 220-1201 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: Jul 4, 2026
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