Port 1813/TCP, UDP is used for which RADIUS service?

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Multiple Choice

Port 1813/TCP, UDP is used for which RADIUS service?

Explanation:
RADIUS assigns separate ports for its two main services: authentication and accounting. The authentication service uses port 1812, while the accounting service uses port 1813. Since the question specifies 1813 (and acknowledges UDP as the transport), this corresponds to the RADIUS accounting protocol, which tracks user activity and session data for billing and auditing. TACACS+ uses a different port (49), and Diameter uses port 3868 by default, making them incorrect in this context.

RADIUS assigns separate ports for its two main services: authentication and accounting. The authentication service uses port 1812, while the accounting service uses port 1813. Since the question specifies 1813 (and acknowledges UDP as the transport), this corresponds to the RADIUS accounting protocol, which tracks user activity and session data for billing and auditing. TACACS+ uses a different port (49), and Diameter uses port 3868 by default, making them incorrect in this context.

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