SISE Network Access Device Administration Practice Question
You are troubleshooting a TACACS+ issue where a user can log in but cannot execute any commands. The policy set hits the correct rule. What is the most likely reason?
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 assigned Command Set is set to 'Deny' for all commands.
If the user is logged in, authentication works, but if no commands are permitted, the associated Command Set is either empty, set to 'Deny' for all, or misconfigured.
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 shared secret is incorrect.
Why it's wrong here
Incorrect shared secret would prevent initial login.
- ✓
The assigned Command Set is set to 'Deny' for all commands.
Why this is correct
If 'Deny' is selected without specific permit rules, all commands are blocked by default.
- ✗
The Network Access Device is not configured with 'aaa authorization commands'.
Why it's wrong here
Without this, the switch wouldn't even send authorization requests for commands.
- ✗
null
Why it's wrong here
null
- ✗
The Shell Profile has a privilege level of 0.
Why it's wrong here
Privilege level 0 allows only very basic commands, but wouldn't block all commands unless specifically restricted.
Visual reference
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.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Cisco exam blueprint
This SISE 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 SISE exam.