350-701 Practice Question: Secure Network Access, Visibility and Enforcement
During a security incident, an engineer needs to quickly quarantine an endpoint that is connected to a switch via 802.1X. The engineer wants to use ISE to send a Change of Authorization (CoA) to move the port to a restrictive VLAN. What must be configured on the switch to allow ISE to send CoA?
⚠ Common exam trap
Cisco often tests the misconception that CoA uses UDP port 1700 (the standard RADIUS authentication port) rather than the correct port 3799 defined in RFC 5176 for dynamic authorization changes.
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 must have 'aaa server radius dynamic-author' configured with a client entry for ISE
The `aaa server radius dynamic-author` command defines a local RADIUS dynamic-author server on the switch, which listens for Change of Authorization (CoA) and Disconnect messages from ISE. The client entry specifies the ISE server's IP address and shared secret, allowing the switch to accept and process the CoA request to dynamically change the VLAN assignment for the 802.1X-authenticated endpoint.
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 must listen on UDP port 1700 for CoA packets
Why it's wrong here
CoA uses UDP port 3799, not 1700.
- ✓
The switch must have 'aaa server radius dynamic-author' configured with a client entry for ISE
Why this is correct
This command enables the switch to accept CoA requests from ISE.
- ✗
The switch must have a VTY line configured with 'transport input ssh'
Why it's wrong here
VTY is for CLI access, not for CoA.
- ✗
RADIUS accounting must be enabled on the switch
Why it's wrong here
Accounting is not required for CoA to function.
- ✗
The switch must have 'authentication event server dead action authorize' configured
Why it's wrong here
This is for fail-open when RADIUS server is unreachable.
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.