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# Understanding 802.1X and TrustSec Software-defined Segmentation
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. This article delves into the intricacies of these technologies, elucidating how they contribute to a more secure network environment.
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.
```
User Device (Supplicant) <----> Authenticator (Access Switch/Point) <----> Authentication Server (RADIUS)
1. [Supplicant] ---- EAPOL-Start ----> [Authenticator]
2. [Authenticator] ---- EAP-Request/Identity --> [Supplicant]
3. [Supplicant] ---- EAP-Response/Identity -> [Authenticator]
4. [Authenticator] ---- EAP-Response/Identity -> [Authentication Server]
5. [Authentication Server] ---- EAP-Request (Challenge) ----> [Authenticator]
6. [Authenticator] ---- EAP-Request (Challenge) ----> [Supplicant]
7. [Supplicant] ---- EAP-Response (Challenge-Response) ----> [Authenticator]
8. [Authenticator] ---- EAP-Response (Challenge-Response) ----> [Authentication Server]
9. [Authentication Server] <Decision (Success/Fail)> [Authenticator]
10. [Authenticator] <Controls Port Access Based on Decision> [Supplicant]
```
## What is 802.1X?