350-701 Practice Question: Secure Network Access, Visibility and Enforcement
A network engineer is configuring 802.1X on a Cisco switch for wired clients. After configuration, some clients fail authentication. The engineer notices that the clients are not sending any EAP packets. What is the most likely cause?
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
✓
The clients do not have an 802.1X supplicant enabled.
If no EAP packets are sent, the client likely does not have an 802.1X supplicant enabled. Option A is incorrect because access VLAN assignment does not affect EAP transmission. Option B is incorrect because 'authentication port-control auto' is the correct command to enable 802.1X. Option D is incorrect because if the RADIUS server were unreachable, the switch would still see EAP packets from the client.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The switch port is configured with access VLAN instead of voice VLAN.
Why it's wrong here
VLAN assignment does not affect client EAP transmission.
- ✗
The RADIUS server is unreachable.
Why it's wrong here
If the server were unreachable, the switch would still receive EAP packets from the client but would not forward them successfully.
- ✓
The clients do not have an 802.1X supplicant enabled.
Why this is correct
Without a supplicant, clients cannot initiate EAP.
- ✗
The switch port is configured with 'authentication port-control auto'.
Why it's wrong here
This is the correct configuration to enable 802.1X; it does not prevent EAP packets.
Visual reference
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
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.