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Question

Difficulty: EasyVirtual Private Networks and Remote Access Security

A network administrator is configuring remote access VPN user authentication to forward requests to a central server using RADIUS. Which transport protocol and default destination port does RADIUS use for authentication traffic?

  1. UDP port 1812Answer
  2. B
    TCP port 1812
  3. C
    TCP port 49
  4. D
    UDP port 443

Answer

RADIUS uses UDP port 1812 by default for authentication traffic.
RADIUS relies on UDP transport and uses port 1812 by default for authentication and authorization traffic.

Step-by-Step Solution

1
Identify the protocol used for centralized remote access authentication in the scenario.
The scenario specifies RADIUS (Remote Authentication Dial-In User Service).
RADIUS is a widely deployed open-standard AAA protocol.
2
Recall the transport layer protocol and default port assignment for RADIUS authentication.
RADIUS uses UDP port 1812 for authentication and authorization.
Standard RFC 2865 assigns UDP port 1812 to RADIUS authentication services (and UDP port 1813 for RADIUS accounting).

Key Concept

RADIUS Protocol Specifications and Port Assignments
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Topics

Virtual Private Networks and Remote Access Security

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