- A
MAC address filtering
Why wrong: MAC filtering controls which devices can connect based on MAC addresses, but it does not isolate traffic between networks.
- B
Port forwarding
Why wrong: Port forwarding directs external traffic to internal devices and does not provide guest isolation.
- C
Guest network
Enabling a guest network creates a separate VLAN that isolates guest traffic, meeting the customer's requirement.
- D
WPS (Wi-Fi Protected Setup)
Why wrong: WPS simplifies connecting devices but does not provide network isolation or guest access controls.
Question 311 of 1,020
220-1201 Network Configuration Concepts Practice Question
This 220-1201 practice question tests your understanding of network configuration 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 new wireless router for a home office. The customer wants to ensure that guests can access the internet but cannot see other devices on the main network. Which feature should the technician enable on the router?
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
✓
Guest network
Option C is correct because enabling a guest network creates a separate SSID and VLAN (or subnet) that isolates guest traffic from the main LAN. This prevents guests from accessing local devices (e.g., printers, file shares) while still providing internet access through the router's NAT. The isolation is typically achieved via client isolation or AP isolation settings, ensuring Layer 2 separation between the guest and main networks.
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.
- ✗
MAC address filtering
Why it's wrong here
MAC filtering controls which devices can connect based on MAC addresses, but it does not isolate traffic between networks.
- ✗
Port forwarding
Why it's wrong here
Port forwarding directs external traffic to internal devices and does not provide guest isolation.
- ✓
Guest network
Why this is correct
Enabling a guest network creates a separate VLAN that isolates guest traffic, meeting the customer's requirement.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
WPS (Wi-Fi Protected Setup)
Why it's wrong here
WPS simplifies connecting devices but does not provide network isolation or guest access controls.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse MAC address filtering (which restricts access) with network isolation, or think WPS provides security features beyond simple connection convenience.
Detailed technical explanation
How to think about this question
Guest networks often use a separate DHCP scope and may implement firewall rules (e.g., iptables or ebtables) to block inter-VLAN traffic. In enterprise environments, this is achieved with 802.1Q VLAN tagging and ACLs, but consumer routers emulate this with software-based bridging and ebtables rules. A subtle behavior is that some routers allow guest network clients to see each other unless 'Access Intranet' or 'Client Isolation' is explicitly enabled.
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?
Network Configuration Concepts — This question tests Network Configuration Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Guest network — Option C is correct because enabling a guest network creates a separate SSID and VLAN (or subnet) that isolates guest traffic from the main LAN. This prevents guests from accessing local devices (e.g., printers, file shares) while still providing internet access through the router's NAT. The isolation is typically achieved via client isolation or AP isolation settings, ensuring Layer 2 separation between the guest and main networks.
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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