350-701 Practice Question: Secure Network Access, Visibility and Enforcement
A network engineer is troubleshooting an issue where a user's device is successfully authenticated via 802.1X, but the user cannot access the corporate network. ISE logs show that the user was granted access with a downloadable ACL (dACL). What could be the cause of no network access?
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 switch does not support downloadable ACLs.
If the switch does not support downloadable ACLs, it will ignore the dACL attribute and not apply any filtering, potentially blocking traffic. Option B is incorrect because subnet placement does not affect dACL application. Option C is incorrect because the RADIUS server is not involved after authentication. Option D is incorrect because 'access-session port-control auto' is correct configuration.
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 does not support downloadable ACLs.
Why this is correct
Switches that do not support dACLs will ignore the attribute, resulting in no access.
- ✗
The user's device is in a different subnet.
Why it's wrong here
Subnet location does not affect dACL application.
- ✗
The RADIUS server is not reachable after authentication.
Why it's wrong here
After authentication, the RADIUS server is no longer required for data traffic.
- ✗
The switch port is configured with 'access-session port-control auto'.
Why it's wrong here
This is the correct configuration and does not cause issues.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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