Free CompTIA Network+ N10-009 Practice Question

MAC filtering is the correct method for controlling network access based on the hardware addresses (MAC addresses) of devices. This system allows the administrator to define a list of MAC addresses that are authorized to connect to the network, preventing unauthorized devices from accessing network resources, thereby offering a basic layer of security. Using IP addresses alone would not be as effective for this layer of network access control, since IP addresses can be dynamically assigned and may change. Modifying DNS settings impacts how domain names are resolved into IP addresses and does not control network access. Implementing an internal firewall is generally used to control traffic between different segments of the network and doesn't prevent unauthorized devices from connecting to the network.