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350-701 Practice Question: Which component in an 802.1X deployment is…
Which component in an 802.1X deployment 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
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Authenticator (switch/WLC)
The authenticator (typically a switch or wireless LAN controller) acts as an intermediary, forwarding EAP messages between the supplicant 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.
- ✓
Authenticator (switch/WLC)
Why this is correct
The authenticator relays EAP frames between the supplicant and the authentication server.
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Supplicant
Why it's wrong here
The supplicant is the client software that initiates authentication.
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Authentication server (ISE)
Why it's wrong here
The authentication server validates credentials, but does not relay messages between client and server.
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RADIUS proxy
Why it's wrong here
A RADIUS proxy is optional and not a core component of 802.1X.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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