Which feature is characteristic of MAC filtering in wireless networks?
It allows only authorized users to detect the network.
It encrypts data that is transmitted on a wireless network.
It is configured on the computer rather than on the router.
It restricts computer access to a wireless network.
The Correct Answer and Explanation is:
Correct Answer:
It restricts computer access to a wireless network.
Explanation:
Media Access Control (MAC) filtering is a security feature used in wireless networks that restricts access to the network based on the physical addresses of devices. Every network device, such as a laptop, smartphone, or tablet, has a unique identifier called a MAC address. This address is assigned to the device’s network interface card (NIC) and is used to identify the device on a network.
In MAC filtering, the router is configured with a list of approved MAC addresses. Only devices with MAC addresses on this list are allowed to connect to the network. If a device attempts to join the wireless network and its MAC address is not on the approved list, the router will deny access—regardless of whether the correct Wi-Fi password is entered.
Why the other options are incorrect:
- “It allows only authorized users to detect the network”:
This describes a different feature called SSID broadcast suppression or SSID hiding, not MAC filtering. MAC filtering does not prevent devices from detecting the network; it only prevents unauthorized devices from connecting. - “It encrypts data that is transmitted on a wireless network”:
This describes encryption protocols like WPA2, WPA3, or WEP. These protocols secure the data transmitted between the router and connected devices. MAC filtering does not provide encryption. - “It is configured on the computer rather than on the router”:
This is incorrect. MAC filtering is configured on the router, where the administrator can create an allowlist (or sometimes a blocklist) of MAC addresses.
Conclusion:
MAC filtering helps enhance wireless network security by permitting only approved devices to connect. While not foolproof (MAC addresses can be spoofed), it adds an extra layer of control, especially in environments where only known devices should access the network. Therefore, the correct feature of MAC filtering is: “It restricts computer access to a wireless network.”