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Update 802_1x.md
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# Understanding 802.1X and TrustSec Software-defined Segmentation
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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.
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In the ever-evolving landscape of network security, understanding and implementing robust security protocols is paramount.
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Among these, 802.1X and Cisco TrustSec, which involves software-defined segmentation, play a crucial role in securing network access and data transmission.
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```
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User Device (Supplicant) <----> Authenticator (Access Switch/Point) <----> Authentication Server (RADIUS)
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1. [Supplicant] ---- EAPOL-Start ----> [Authenticator]
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2. [Authenticator] ---- EAP-Request/Identity --> [Supplicant]
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3. [Supplicant] ---- EAP-Response/Identity -> [Authenticator]
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4. [Authenticator] ---- EAP-Response/Identity -> [Authentication Server]
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5. [Authentication Server] ---- EAP-Request (Challenge) ----> [Authenticator]
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6. [Authenticator] ---- EAP-Request (Challenge) ----> [Supplicant]
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7. [Supplicant] ---- EAP-Response (Challenge-Response) ----> [Authenticator]
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8. [Authenticator] ---- EAP-Response (Challenge-Response) ----> [Authentication Server]
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9. [Authentication Server] <Decision (Success/Fail)> [Authenticator]
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10. [Authenticator] <Controls Port Access Based on Decision> [Supplicant]
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```
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## What is 802.1X?
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