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Which authentication protocol uses ports 1812 and 1813?
CHAP
RADIUS
TACACS
Kerberos
The correct answer is RADIUS. Kerberos=so many, tacacs=49; On all recent RADIUS server implementations, UDP/1812 is the authentication and authorization port, and UDP/1813 is the accouting port. However, in historic RADIUS versions, these ports were different: UDP/1645 for autentication and authorization, and UDP/1646 for accounting.
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