SDSI Risk Events And Requirements Practice Question
Which Cisco feature is used to ensure that only authorized devices can connect to the network?
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
✓
Cisco ISE (802.1X).
802.1X, managed by Cisco ISE, is the standard for device authorization.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cisco Umbrella.
Why it's wrong here
Umbrella manages internet access, not network connectivity.
- ✓
Cisco ISE (802.1X).
Why this is correct
ISE uses 802.1X to verify device credentials before allowing network port access.
- ✗
Cisco Firepower IPS.
Why it's wrong here
IPS is for traffic inspection, not port-based access control.
- ✗
Cisco Stealthwatch.
Why it's wrong here
Stealthwatch is for monitoring, not enforcement.
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
This SDSI question is part of Courseiva's 298-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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 SDSI 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 SDSI exam.