Drag steps to the numbered slots on the right, or tap a step then tap a slot.
Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5
mediumDrag & DropObjective-mapped
350-401 Practice Question: Drag and drop the steps of RADIUS CoA (Change of…
Drag and drop the steps of RADIUS CoA (Change of Authorization) message flow into the correct order, from first to last.
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 server determines session needs reauthorization
RADIUS CoA allows a RADIUS server to dynamically change an active session's authorization. The server sends a CoA-Request to the network access device (NAD), which validates the request, applies the change, and responds with a CoA-ACK or CoA-NAK.
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.
Go deeper
Related to this question
Learn chapter
Network Architecture Fundamentals
Key term
RADIUS vs TACACS+
RADIUS and TACACS+ are two network protocols used to verify user identities and control access to network devices and services, with different approaches to security and flexibility.
Key term
802.1X Authentication
802.1X is a network access control protocol that prevents unauthorized devices from connecting to a wired or wireless network by requiring them to authenticate before gaining access.
About these practice questions
One of 1,175 original 350-401 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more way this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop the steps of RADIUS CoA (Change of Authorization) message flow into the correct order, from first to last.
medium- ✓ A.RADIUS server sends CoA-Request to NAS
- ✓ B.NAS validates CoA-Request
- ✓ C.NAS sends CoA-ACK to server
- ✓ D.NAS applies new authorization policy
- ✓ E.NAS re-authenticates or disconnects session
Why A: RADIUS CoA allows a server to dynamically change a session's authorization. The server sends a CoA-Request to the network access server (NAS). The NAS acknowledges with CoA-ACK and applies the new policy. If the session is affected, the NAS may send a disconnect or re-authenticate.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-401 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 350-401 exam.