Information Technology Specialist (ITS) Cybersecurity Practice Exam

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What is a key advantage of using a device's MAC address for access control on guest wireless networks instead of its IP address?

MAC address can be easily changed
IP address security is easily bypassed
MAC address remains the same, while IP address can change
IP address offers better tracking capabilities

The correct answer is: MAC address remains the same, while IP address can change

Using a device's MAC address for access control on guest wireless networks offers the key advantage that the MAC address remains constant, whereas the IP address can change. Each network interface card (NIC) has a unique MAC address assigned by the manufacturer, and it does not change regardless of the network to which the device connects. This makes MAC addresses particularly suitable for access control because they provide a stable identifier for each device. In contrast, the dynamic nature of IP addresses, especially in networks that use DHCP (Dynamic Host Configuration Protocol), means that a device's IP address can change each time it connects to the network or even during the same session. This variability could complicate access control since the associated security policies based on IP addresses would need to be constantly updated to reflect these changes. By leveraging MAC addresses, network administrators can establish more reliable and persistent access control measures on guest networks without having to track fluctuating IP assignments.