Drag a concept onto its matching description — or click a concept then click the description.
Concepts
Matches
RADIUS
TACACS+
RADIUS
TACACS+
RADIUS
mediumMatchingObjective-mapped
CCNP Practice Question: Drag and drop each AAA service on the left to its…
Drag and drop each AAA service on the left to its matching protocol on the right.
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
✓
Authentication: RADIUS
Authentication uses RADIUS; authorization uses TACACS+; accounting uses RADIUS; command authorization uses TACACS+; dot1x authentication uses RADIUS.
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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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 each AAA service on the left to its matching protocol on the right.
medium- ✓ P1.Authentication: RADIUS
- ✓ P2.Authorization: TACACS+
- ✓ P3.Accounting: RADIUS
- ✓ P4.Encryption of entire packet: TACACS+
- ✓ P5.Separation of AAA functions: TACACS+
Why P1: Authentication typically uses RADIUS, authorization uses TACACS+, accounting can use either, but RADIUS is more common for accounting; TACACS+ encrypts the entire packet and separates AAA functions.
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.