This FC0-U61 practice question tests your understanding of infrastructure. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 wants to set up a wireless network for employees and guests. The owners are concerned about unauthorized access. Which of the following security measures would be MOST effective to prevent outsiders from connecting?
Enable MAC address filtering
Why wrong: MAC addresses can be spoofed easily.
Disable SSID broadcast
Why wrong: Hiding SSID is a weak security measure; attackers can still detect the network.
Disable DHCP on the router
Why wrong: Without DHCP, devices can still connect with static IP if they know the subnet.
Use WPA2 encryption with a strong passphrase
WPA2 provides strong encryption and authentication.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use WPA2 encryption with a strong passphrase
Option B is correct because WPA2 encryption with a strong password is the standard for securing Wi-Fi. Option A is wrong because SSID broadcast hiding is easily bypassed. Option C is wrong because MAC filtering can be spoofed. Option D is wrong while disabling DHCP may hinder but not prevent connection; static IP can be guessed.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Enable MAC address filtering
Why it's wrong here
MAC addresses can be spoofed easily.
Disable SSID broadcast
Why it's wrong here
Hiding SSID is a weak security measure; attackers can still detect the network.
Disable DHCP on the router
Why it's wrong here
Without DHCP, devices can still connect with static IP if they know the subnet.
Use WPA2 encryption with a strong passphrase
Common exam traps
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related FC0-U61 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Infrastructure — This question tests Infrastructure — CIDR notation defines the prefix length..
The correct answer is: Use WPA2 encryption with a strong passphrase — Option B is correct because WPA2 encryption with a strong password is the standard for securing Wi-Fi. Option A is wrong because SSID broadcast hiding is easily bypassed. Option C is wrong because MAC filtering can be spoofed. Option D is wrong while disabling DHCP may hinder but not prevent connection; static IP can be guessed.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related FC0-U61 subnetting questions on CIDR, address ranges, and subnet selection.
CIDR notation defines the prefix length.
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Last reviewed: Jun 24, 2026
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