A NAC appliance is a network device that controls which users and devices can access a network. NAC stands for Network Access Control.

It checks devices before allowing them to connect. It can block or restrict devices that do not meet the network’s security requirements.

How It Works

• A device tries to connect to the network.
• The NAC appliance checks the device and user.
• It can check things such as login details and security settings.
• Approved devices receive network access.
• Unapproved devices can be blocked or placed on a restricted network.

Common Uses

• Controlling access to company networks.
• Preventing unknown devices from connecting.
• Managing employee and guest access.
• Isolating devices that may pose security risks.
• Enforcing network access policies.

Related Terms: Network Access Control, Authentication, Authorization, Network Security, Access Control, RADIUS, 802.1X, Guest Network, Device Authentication, Network Policy

Related Entries

• Eavesdrop Protection
• VPN Tunnel