350-701 ISE credential caching Practice Question
An organization uses ISE for wireless LAN authentication via 802.1X with PEAP-MSCHAPv2. Users authenticate against Active Directory. Recently, some users report that after changing their domain password, they cannot connect to the wireless network for about 30 minutes. 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
✓
ISE has cached the previous password and is still using it for authentication
ISE caches user credentials for efficiency, including the password used during 802.1X authentication. When a user changes their domain password, ISE may still have the old password cached and will attempt to authenticate with it until the cache expires (typically up to 30 minutes). Option A is incorrect because DNS updates are not related to cached passwords; stale DNS records would affect all users, not just those with recent password changes. Option C is incorrect because wireless controllers do not cache passwords for 802.1X; they forward credentials to the RADIUS server (ISE). Option D is incorrect because the RADIUS server (ISE) is the one caching credentials, not the wireless controller.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DNS records for the domain controller have not updated
Why it's wrong here
DNS updates are unrelated to password caching; stale DNS would affect all users, not just those who changed passwords.
- ✓
ISE has cached the previous password and is still using it for authentication
Why this is correct
ISE caches credentials to improve performance; after a password change, the cached old password is still used until the cache refreshes, causing a delay of about 30 minutes.
- ✗
The wireless controller has a local password cache
Why it's wrong here
Wireless controllers do not cache passwords locally for 802.1X; they pass authentication requests to the RADIUS server.
- ✗
The RADIUS server on the wireless controller is caching credentials
Why it's wrong here
The RADIUS server (ISE) is the component that caches credentials, not the wireless controller.
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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