#1) This licenses will include RADIUS and TACACS+ based functionality for up to 500 network access devices (NADs). This license comes by default with the purchase of ACS. You can get additional feature licenses:
L-CSACS-5-LRG-LIC - Provides support for more than 500 NADs. (You need one license per deployment)
CSACS-5-ADV-LIC - Enables TrustSec/SGA/SGT - Security Group Access / Security Group Tagging
#2) Yes, at the end of the day ACS is a RADIUS and will support other vendors. For instance, I have used it in the past with Brocade, Aruba and Adtran
#3) There are constantly new features and bug fixes done with new releases. Even ACS 5.8 is now out. The best way to get information about new features and bugs resolved is to look through the release notes:
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