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350-701 Practice Question: During 802.1X authentication, which component…
During 802.1X authentication, which component acts as the intermediary that forwards authentication requests 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
In the 802.1X architecture, the authenticator (typically a switch or wireless LAN controller) is the network device that relays EAP messages between the supplicant and the authentication server (e.g., 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.
- ✗
Authentication server
Why it's wrong here
The authentication server validates credentials and makes access decisions.
- ✗
RADIUS proxy
Why it's wrong here
A RADIUS proxy forwards authentication messages between realms but is not a core component of the 802.1X standard.
- ✓
Authenticator
Why this is correct
The authenticator is the network device that enforces access control and relays EAP frames.
- ✗
Supplicant
Why it's wrong here
The supplicant is the client software that initiates authentication.
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
This 350-701 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-701 exam.