Which of the following options is a functionality or tool that disallows access to a wireless network based on the layer 2 address of the client device?
Answer Description
Layer 2 addresses (also called physical address) are MAC addresses. Using MAC filtering you can disallow any devices that are not explicitly granted access. While this can help increase security, it is not fool proof and advanced attackers can easily spoof the MAC address to gain access. MAC filtering alone is not sufficient to protect a network.
Wikipedia
In computer networking, MAC Filtering refers to a security access control method whereby the MAC address assigned to each network card is used to determine access to the network.
MAC addresses are uniquely assigned to each card, so using MAC filtering on a network permits and denies network access to specific devices through the use of blacklists and whitelists. While the restriction of network access through the use of lists is straightforward, an individual person is …
MAC filtering - Wikipedia, the free encyclopedia