MAC Address Filtering

Correct Answer: Implement MAC address filtering.

The most effective method for allowing only specific devices to access a network would be to implement MAC address filtering. A MAC address is a unique identifier for each hardware device. Each device that the administrator wishes to allow on the network could be added to a whitelist, and all other devices would be blocked by default. This is more effective than the other methods because IP addresses can be spoofed or can change over time, making IP address filtering unreliable. Password-based authentication can be secure, but it can also be potentially compromised by users sharing passwords or by brute force attacks. Packet filtering is more about controlling the types of data that are allowed on the network, not which devices can access the network.

Correct Answer: Enable MAC address filtering on the wireless access point.

The best solution for a company wanting to block unauthorized devices from connecting to their wireless network is to 'Enable MAC address filtering on the wireless access point'. This method allows the company to specify which devices are permitted to connect to the wireless network by allowing only the MAC addresses of authorized devices to connect. The other solutions are not as secure. 'Enable password-based authentication on the wireless access point' is not as secure because passwords can be cracked or shared. 'Create a guest network without access to company resources' does not prevent unauthorized devices from connecting, it simply limits their access once connected. 'Disable the SSID broadcasting' only makes the network invisible to casual users but does not prevent unauthorized devices from connecting if they know the SSID.

Correct Answer: MAC address spoofing by unauthorized devices.

MAC address filtering is a feature that allows you to specify a list of allowed devices on your network based on their MAC addresses. However, one problem with this is that MAC addresses can be easily spoofed, or faked, where an unauthorized device pretends to have the MAC address of an authorized one. This is why 'MAC address spoofing by unauthorized devices' is the most likely issue to arise. The other problems mentioned in the other answers are not directly caused by MAC address filtering. Increased latency due to additional filtering overhead could occur, but it's marginal and not the main issue. Potential data corruption due to invalid MAC addresses would likely be a symptom of another problem, not MAC address filtering. And, MAC address filtering has no direct relation to IP address conflicts.