- A
Enable MAC address filtering on the wireless access point.
Why wrong: MAC filtering controls which devices can connect, but it does not logically separate traffic once connected; all devices on the same network could still access internal resources.
- B
Implement a guest VLAN that is isolated from the internal network.
A guest VLAN creates a separate logical network segment, allowing internet access while blocking access to internal resources via routing rules.
- C
Require a complex password for the guest Wi-Fi network.
Why wrong: A password only controls who can join the network; once connected, guests could still access internal resources unless segmentation is used.
- D
Disable the SSID broadcast for the guest network.
Why wrong: Hiding the SSID is a weak security measure that does not prevent access to internal resources once the network is discovered.
Guest VLAN: Network Segmentation for Guest Users
This 220-1202 practice question tests your understanding of logical security concepts. 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 technician is configuring a small office network and wants to ensure that guest users can access the internet but cannot connect to internal company resources like file servers or printers. Which logical security method should be implemented?
Quick Answer
The answer is to implement a guest VLAN that is isolated from the internal network. This is correct because a guest VLAN uses network segmentation to create a separate broadcast domain for guest users, allowing them internet access while logically blocking traffic to internal resources like file servers and printers. On the CompTIA A+ Core 2 220-1202 exam, this concept tests your understanding of logical security controls versus physical ones—a common trap is confusing VLANs with physical network separation or firewall rules alone. Remember that VLANs operate at Layer 2 of the OSI model, so the key is that guest VLAN network segmentation isolates guest users without needing extra hardware. A helpful memory tip: think of a VLAN as a virtual fence—guests can see the internet outside the fence, but they cannot enter the company’s private yard.
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
Implement a guest VLAN that is isolated from the internal network.
Option B is correct because a guest VLAN configured with access control lists (ACLs) or private VLAN features isolates guest traffic from the internal corporate VLAN. This ensures guest users can reach the internet via a default gateway or NAT while being unable to route or bridge to internal subnets containing file servers or printers. This is a standard logical segmentation method defined in IEEE 802.1Q.
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.
- ✗
Enable MAC address filtering on the wireless access point.
Why it's wrong here
MAC filtering controls which devices can connect, but it does not logically separate traffic once connected; all devices on the same network could still access internal resources.
- ✓
Implement a guest VLAN that is isolated from the internal network.
Why this is correct
A guest VLAN creates a separate logical network segment, allowing internet access while blocking access to internal resources via routing rules.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Require a complex password for the guest Wi-Fi network.
Why it's wrong here
A password only controls who can join the network; once connected, guests could still access internal resources unless segmentation is used.
- ✗
Disable the SSID broadcast for the guest network.
Why it's wrong here
Hiding the SSID is a weak security measure that does not prevent access to internal resources once the network is discovered.
Common exam traps
Common exam trap: answer the scenario, not the keyword
In CompTIA A+ exams, candidates often confuse access control methods like passwords or SSID hiding with true network segmentation. The key is that logical segmentation via VLANs isolates traffic at Layer 2, whereas authentication and association controls only restrict who can connect, not what they can access once connected.
Detailed technical explanation
How to think about this question
Under the hood, a guest VLAN is typically implemented by tagging guest traffic with a specific 802.1Q VLAN ID (e.g., VLAN 10) on the switch port connected to the access point, then applying an ACL on the Layer 3 interface of that VLAN to permit only internet-bound traffic (e.g., deny ip 10.0.10.0 0.0.0.255 192.168.1.0 0.0.0.255). In real-world deployments, this is often combined with a captive portal for authentication and a separate DHCP scope for guest IPs, ensuring complete Layer 3 isolation.
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
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FAQ
Questions learners often ask
What does this 220-1202 question test?
Logical Security Concepts — This question tests Logical Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Implement a guest VLAN that is isolated from the internal network. — Option B is correct because a guest VLAN configured with access control lists (ACLs) or private VLAN features isolates guest traffic from the internal corporate VLAN. This ensures guest users can reach the internet via a default gateway or NAT while being unable to route or bridge to internal subnets containing file servers or printers. This is a standard logical segmentation method defined in IEEE 802.1Q.
What should I do if I get this 220-1202 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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