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# Understanding 802.1X and TrustSec Software-defined Segmentation
# What is 802.1X?
In the ever-evolving landscape of network security, understanding and implementing robust security protocols is paramount.
Among these, 802.1X and Cisco TrustSec, which involves software-defined segmentation, play a crucial role in securing network access and data transmission.
802.1X is an IEEE Standard for port-based Network Access Control (PNAC). It is a protocol that enhances security in networks, both wired and wireless, by providing an authentication mechanism for devices trying to connect to a LAN or WLAN.
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User Device (Supplicant) <----> Authenticator (Access Switch/Point) <----> Authentication Server (RADIUS)
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10. [Authenticator] <Controls Port Access Based on Decision> [Supplicant]
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## What is 802.1X?
802.1X is an IEEE Standard for port-based Network Access Control (PNAC). It is a protocol that enhances security in networks, both wired and wireless, by providing an authentication mechanism for devices trying to connect to a LAN or WLAN.
### Key Features of 802.1X:
- **Authentication**: It uses the Extensible Authentication Protocol (EAP) over LAN (EAPOL) to authenticate devices.