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200-201 Practice Question: The effect of this configuration on a Cisco…
Exhibit
Refer to the exhibit. ! aaa new-model aaa authentication login default local aaa authorization exec default local ! username admin password cisco !
What is the effect of this configuration on a Cisco device?
⚠ Common exam trap
Cisco often tests the distinction between authentication, authorization, and accounting (AAA) services, and the trap here is that candidates confuse the protocol used for authentication (TACACS+ or RADIUS) with the method (local vs. server-based), leading them to pick an option that assumes an external server is involved when only local authentication is configured.
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
✓
Users are authenticated using the local database.
The configuration shown (not provided in the question, but implied by the correct answer) is a typical local authentication setup, such as 'aaa authentication login default local' or a username/password defined in the device's local database. This means the device uses its own stored credentials to authenticate users, not an external server. Option C is correct because local authentication is explicitly configured, bypassing any external AAA server.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Users are authenticated using a TACACS+ server.
Why it's wrong here
No TACACS+ server is specified; only local is used.
- ✗
Authorization is done via RADIUS.
Why it's wrong here
No RADIUS configuration is present.
- ✓
Users are authenticated using the local database.
Why this is correct
The 'local' keyword means the local username database is used.
- ✗
No authentication is required.
Why it's wrong here
Authentication is configured and required.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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