I'm reading about 802.1X, mainly on Wikipedia, but can't quite get it. So here is a very basic question:
What is meant, when they say that 802.1X is "port-based"?
Well as the standard says:
"Port-based network access control makes use of the physical access characteristics of IEEE 802 LAN infrastructures in order to provide a means of authenticating and authorizing devices attached to a LAN port that has point-to-point connection characteristics, and of preventing access to that port in cases which the authentication and authorization fails. A port in this context is a single point of attachment to the LAN infrastructure."