Question 694 of 1,840
mediumMultiple ChoiceObjective-mapped
350-401 Practice Question: Consider this AAA configuration: aaa new-model…
Consider this AAA configuration:
aaa new-model aaa authentication login default local aaa authorization exec default local aaa accounting exec default start-stop group tacacs+
tacacs-server host 10.0.0.1 key SecretKey
line con 0
login authentication default
line vty 0 4
login authentication default
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the distinction between authentication, authorization, and accounting method lists, and the trap here is that candidates assume 'default' in the accounting command implies local accounting, when in fact it refers to the method list name and the actual method is specified by 'group tacacs+'.
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
✓
All login attempts use local authentication; exec accounting is sent to TACACS+.
The configuration sets AAA authentication login to use the local user database (via 'aaa authentication login default local'), so all login attempts (console and VTY) authenticate against the local device. Authorization for exec sessions is also set to local ('aaa authorization exec default local'), meaning no external authorization is used. Accounting for exec sessions is configured with 'start-stop' and points to the TACACS+ server at 10.0.0.1, so all exec session start and stop records are sent to TACACS+. This matches option A.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
All login attempts use local authentication; exec accounting is sent to TACACS+.
Why this is correct
Correct. Authentication is local, authorization is local, accounting is sent to TACACS+.
- ✗
All login attempts use TACACS+ authentication; exec accounting is local.
Why it's wrong here
Incorrect. Authentication uses local, not TACACS+.
- ✗
Console login uses TACACS+; VTY login uses local; accounting is sent to TACACS+.
Why it's wrong here
Incorrect. Both lines use the same 'default' method list (local).
- ✗
Authentication and authorization are both performed by TACACS+; accounting is local.
Why it's wrong here
Incorrect. Both authentication and authorization use local.
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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Last reviewed: Jul 4, 2026
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