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Logical Security Concepts →mediumMultiple ChoiceObjective-mapped

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.

220-1102 Logical Security Concepts Practice Question

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?

Question 1mediummultiple choice

Full question →

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.

Full breakdown with real-world context →

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.

Network segmentation, often achieved through VLANs, separates network traffic into distinct broadcast domains. A guest VLAN can be configured with access only to the internet, while internal resources remain on a separate VLAN with restricted access. This question tests the understanding of network segmentation as a logical security control.

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.

✗
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
Access ports place end devices into a single VLAN.
✗
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: 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.

What to study next

Got this wrong? Here's your next step.

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 220-1202 questions on switching, trunking, and access-port configuration.

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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 — Access ports place end devices into a single VLAN..

What is the correct answer to this question?

The correct answer is: Implement a guest VLAN that is isolated from the internal network. — Network segmentation, often achieved through VLANs, separates network traffic into distinct broadcast domains. A guest VLAN can be configured with access only to the internet, while internal resources remain on a separate VLAN with restricted access. This question tests the understanding of network segmentation as a logical security control.

What should I do if I get this 220-1202 question wrong?

What is the key concept behind this question?

Access ports place end devices into a single VLAN.

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