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350-701 Practice Question: Which protocol does Cisco ISE use to communicate…
Which protocol does Cisco ISE use to communicate with network devices for 802.1X authentication?
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
✓
RADIUS
Cisco ISE uses RADIUS for authentication, authorization, and accounting. 802.1X leverages EAP over RADIUS.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
RADIUS
Why this is correct
RADIUS is the protocol for network access control.
- ✗
LDAP
Why it's wrong here
LDAP is a directory access protocol, not used for 802.1X.
- ✗
SNMP
Why it's wrong here
SNMP is used for network management, not authentication.
- ✗
TACACS+
Why it's wrong here
TACACS+ is used for device administration, not 802.1X.
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.