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350-401 Practice Question: Which two statements about AAA accounting are…
Which two statements about AAA accounting are true? (Choose two.)
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 accounting uses UDP as the transport protocol.
AAA accounting tracks user activities and resource usage. RADIUS accounting uses UDP ports 1646/1813, while TACACS+ uses TCP port 49. Accounting can be start-stop, stop-only, or wait-start. The wait-start method delays service until the accounting start is acknowledged, which can impact user experience. TACACS+ encrypts the entire packet, including accounting data.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
RADIUS accounting uses UDP as the transport protocol.
Why this is correct
Correct because RADIUS uses UDP for both authentication and accounting.
- ✗
TACACS+ accounting uses UDP as the transport protocol.
Why it's wrong here
Incorrect because TACACS+ uses TCP, not UDP.
- ✓
The wait-start accounting method delays service until the accounting start packet is acknowledged by the server.
Why this is correct
Correct because wait-start holds the connection until the AAA server confirms receipt of the start record.
- ✗
AAA accounting is only supported for EXEC sessions, not for network access.
Why it's wrong here
Incorrect because accounting can be configured for EXEC, network, connection, and system events.
- ✗
TACACS+ encrypts only the password portion of the accounting packet.
Why it's wrong here
Incorrect because TACACS+ encrypts the entire packet body, not just the password.
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
EtherChannel and Advanced Switching Technologies
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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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.