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350-701 Practice Question: Which component in the 802.1X architecture is…
Which component in the 802.1X architecture is responsible for relaying authentication messages between the client and the authentication server?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Authenticator
The authenticator (e.g., switch or wireless LAN controller) acts as a proxy, forwarding EAP messages between the supplicant (client) and the authentication server (ISE).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Supplicant
Why it's wrong here
The supplicant is the client software initiating authentication.
- ✓
Authenticator
Why this is correct
Correct. The authenticator relays EAP messages between supplicant and authentication server.
- ✗
Authentication Server
Why it's wrong here
The Authentication Server (typically a RADIUS server) validates credentials against a directory such as Microsoft Entra ID, but it does not relay messages; the authenticator (e.g., a switch or wireless controller) forwards EAP frames between the supplicant and the Authentication Server. It is tempting because the Authentication Server is central to the 802.1X decision process, and in a scenario asking which component *validates* credentials, it would be the correct choice.
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Policy Service Node
Why it's wrong here
Policy Service Node is part of ISE but not the component that relays messages in the 802.1X architecture; that role is the authenticator.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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