Drag and drop each TACACS+ packet type on the left to its matching function on the right.
Drag a concept onto its matching description — or click a concept then click the description.
Initiates an authentication session and contains the username
Sends a challenge (e.g., password prompt) or authentication result
Carries the user's response to a challenge
Indicates successful authentication and may include authorization attributes
Indicates authentication failure
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 and contains the username
START begins authentication and contains username; REPLY sends challenge or result; CONTINUE sends response to challenge; ACCEPT indicates successful authentication; REJECT indicates authentication failure.
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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Variation 1. Drag and drop each TACACS+ packet type on the left to its correct function on the right.
mediumWhy P1: 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.
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.