Which official port should be used when configuring external RADIUS authentication on a Cisco WLC version 7.0?
A . 49
B . 1645
C . 1646
D . 1812
E . 1813
Answer: D
Explanation:
RADIUS authentication uses UDP port 1812, while accounting uses UDP port 1813. Early implementations of RADIUS used ports 1645 and 1646, but that usage is obsolete.
http://docstore.mik.ua/orelly/networking_2ndEd/fire/ch21_07.htm