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Difficulty: MediumAAA Framework and Authentication Methods

A network engineer is configuring a centralized AAA server to support 802.1X port-based network access control across an enterprise wireless deployment. Which configuration parameters accurately specify the default transport protocol and port assignments required for standard RADIUS authentication and accounting services?

  1. UDP ports 1812 for authentication and 1813 for accountingAnswer
  2. B
    TCP ports 1812 for authentication and 1813 for accounting
  3. C
    UDP port 49 for both authentication and accounting traffic
  4. D
    TCP port 49 with full packet payload encryption for both functions

Answer

The standard configuration for RADIUS authentication and accounting uses UDP ports 1812 and 1813, respectively.
Standard RADIUS implementation relies on UDP transport, utilizing port 1812 for authentication/authorization and port 1813 for accounting.

Step-by-Step Solution

1
Identify the transport protocol used by RADIUS
RADIUS uses User Datagram Protocol (UDP) for low-overhead client-server communication.
Understanding transport protocol requirements is critical for proper firewall and service configuration.
2
Identify standard RADIUS service port assignments
RFC 2865 assigns UDP port 1812 for RADIUS authentication/authorization, and RFC 2866 assigns UDP port 1813 for RADIUS accounting.
Centralized AAA authentication servers rely on these specific port bindings to separate authentication requests from audit/accounting logs.

Key Concept

RADIUS Operational Parameters and Port Assignments
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Topics

AAA Framework and Authentication Methods

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