Which standard is used for port-based authorization on wired and wireless networks?

The standard used for port-based authorization on both wired and wireless networks is 802.1x. This framework provides a method for authenticating devices wishing to connect to a LAN or WLAN. It works by leveraging the Extensible Authentication Protocol (EAP) and enables network devices, such as switches and wireless access points, to control access to the network based on the authentication state of the connected devices.

When a device attempts to connect, 802.1x facilitates an authentication process through a supplicant (the client device), an authenticator (the network switch or access point), and an authentication server (often a RADIUS server). This process ensures that only authorized users can gain access to the network, enhancing security by managing access at the port level.

In contrast, other standards listed do not focus specifically on port-based authorization. Diameter is a protocol for authentication, authorization, and accounting, but it is not primarily used for port-based access control. EAP-TLS and EAP-MD5 are both authentication methods that operate within the EAP framework but do not themselves provide the overarching control that 802.1x offers regarding network access based on port status.