In the "Guidelines for Configuring IEEE 802.1X Multidomain Authentication" (https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_8021x/configuration/xe-3se/5700/sec-user-8021x-xe-3se-5700-book/sec-ieee-mda.html)it says: MDA allows both a data de...