Drag and drop each TACACS+ packet type on the left to its correct function on the right.
Drag a concept onto its matching description — or click a concept then click the description.
Initiates an authentication session from the client to the server
Sent by the server to the client, carrying prompts or authentication results
Sent by the client to the server with the user's response to a prompt
Used for authorization requests and responses
Used for accounting start, stop, and interim records
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
START: Initiates an authentication session from the client to the server
TACACS+ uses START to initiate authentication, REPLY to respond with prompts or success/failure, CONTINUE to send user responses, and also has special types for authorization and accounting.
Quick reference
| 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
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.