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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
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RADIUS server sends CoA-Request to NAS
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.
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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Related to this question
Learn chapter
Network Architecture Fundamentals
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.
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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