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+# RADIUS, TACACS+, and Diameter
+
+The following is a comparison table for the RADIUS, TACACS+, and Diameter protocols.
+
+| Feature             | RADIUS                             | TACACS+                            | Diameter                          |
+|---------------------|------------------------------------|------------------------------------|-----------------------------------|
+| Transport Protocol  | UDP                                | TCP                                | TCP or SCTP                        |
+| Encryption          | Only password encryption           | Full packet encryption             | Full packet encryption            |
+| AAA Support         | Combined AAA (Authentication, Authorization, Accounting) | Separate AAA (Authentication, Authorization, and Accounting are distinct) | Combined AAA                      |
+| Usage               | Network access and IP mobility     | Device administration              | Mobile IP, SIP, NASREQ            |
+| Interoperability    | Limited                            | Cisco-focused                      | Wider than RADIUS                 |
+| Standardization     | RFC 2865 & RFC 2866                | Cisco proprietary                  | RFC 6733                           |
+