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350-401 Practice Question: Which three statements about configuring AAA on…
Which three statements about configuring AAA on Cisco IOS devices are true? (Choose three.)
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
✓
The aaa new-model command enables AAA services on the device.
The correct answers cover common AAA configuration steps. Option A is correct because the aaa new-model command enables AAA on a Cisco IOS device. Option C is correct because the radius-server host command specifies the RADIUS server IP and shared secret. Option E is correct because the aaa authentication login command defines a method list for login authentication. Option B is wrong because the aaa new-model command does not disable local authentication; it enables AAA. Option D is wrong because the tacacs-server host command is used for TACACS+, not RADIUS.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The aaa new-model command enables AAA services on the device.
Why this is correct
Correct because aaa new-model is required to activate AAA on Cisco IOS.
- ✗
The aaa new-model command disables local authentication and forces the use of an external server.
Why it's wrong here
Incorrect because aaa new-model enables AAA but does not automatically disable local authentication; method lists define the order.
- ✓
The radius-server host command is used to specify the IP address and shared secret for a RADIUS server.
Why this is correct
Correct because radius-server host configures the RADIUS server details.
- ✗
The tacacs-server host command is used to specify the IP address and shared secret for a RADIUS server.
Why it's wrong here
Incorrect because tacacs-server host is for TACACS+ servers, not RADIUS.
- ✓
The aaa authentication login command defines a method list for login authentication.
Why this is correct
Correct because aaa authentication login creates a method list that specifies authentication order.
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
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EIGRP: Basics and Advanced Configuration
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.
Key term
AAA on Cisco Devices
AAA on Cisco devices is a security framework that controls who can access the network, what they can do, and keeps a record of their actions.
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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.