An engineer is implementing NAC for LAN users on a segmented network. The engineer confirms that the device of each user is supported and the Cisco switch configuration is correct. Which…

The correct answer is D. Permit UDP port 1812. In a Network Access Control (NAC) implementation using RADIUS for LAN users, UDP port 1812 must be permitted to handle authentication traffic between the Cisco switch and the RADIUS server. This port is the default for RADIUS authentication and must be open to avoid…

Submitted by paula_co· Mar 30, 2026Secure Network Access, Visibility, and Enforcement

Question

An engineer is implementing NAC for LAN users on a segmented network. The engineer confirms that the device of each user is supported and the Cisco switch configuration is correct. Which configuration should be made next to ensure there are no authentication issues?

Options

ADisable the host firewall.
BEnable TACACS+ on the switch.
COpen TCP port 49.
DPermit UDP port 1812.

How the community answered

(57 responses)

A
9% (5)
B
5% (3)
C
16% (9)
D
70% (40)

Explanation

In a Network Access Control (NAC) implementation using RADIUS for LAN users, UDP port 1812 must be permitted to handle authentication traffic between the Cisco switch and the RADIUS server. This port is the default for RADIUS authentication and must be open to avoid authentication issues.

Topics

#NAC#RADIUS#UDP 1812#Authentication ports

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