NAC is a method to control and allow only authorized devices to be connected to the network. It is more common for wired network and devices connecting with a hard-wire or a virtual interface to the network. Most wireless networks already have certain access controls available and enforced via 802.1X, WPA to ensure only authorized users or devices can connect to the wireless network.
In a wired network or a standard Ethernet switch, by default, you can connect any device to the network and obtain access. Most networks have a DHCP infrastructure running which provides an IP address to a newly connected device. This makes a wired network vulnerable as an intruder also can physically connect to the network once they get physical ...
