350-701 Practice Question: Secure Network Access, Visibility and Enforcement
Exhibit
Refer to the exhibit. Switch# show authentication sessions interface GigabitEthernet1/0/1 detail Interface: GigabitEthernet1/0/1 MAC Address: 0011.2233.4455 IP Address: 192.168.1.15 User-Name: hostA Status: Unauthorized Domain: DATA Oper host mode: single-host Authorized By: N/A Vlan Policy: N/A Session timeout: N/A Idle timeout: N/A Common Session ID: 0A0B0C0D0E0F0001 Acct Session ID: 0x00000001 Handle: 0x81000001 Runnable method list: dot1x Last Authentication: Failed Reason: EAP-timeout
A user connected to port Gi1/0/1 cannot access the network. Based on the output, 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 client does not support 802.1X
The 'Reason: EAP-timeout' indicates that the client did not respond to 802.1X EAP requests, which typically means the client does not support 802.1X or it is not enabled. Option A is incorrect because if the RADIUS server were unreachable, the switch would likely use a critical VLAN, but the reason is EAP-timeout from the client side. Option C is incorrect because AAA configuration would cause different errors. Option D is incorrect because 'Errdisable' would show a different port state.
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 RADIUS server is unreachable
Why it's wrong here
Would show 'Critical' or 'No server' state.
- ✓
The client does not support 802.1X
Why this is correct
EAP-timeout indicates client not responding to EAP.
- ✗
The switch has a misconfigured AAA command
Why it's wrong here
Would cause configuration errors, not EAP-timeout.
- ✗
The port is in errdisable state
Why it's wrong here
Port state would be errdisable, not unauthorized.
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
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