SDSI Secure Infrastructure Design Practice Question
Which Cisco solution provides DNS-layer security to prevent users from connecting to malicious domains?
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 Umbrella.
Cisco Umbrella uses DNS filtering to block requests to known malicious domains at the resolution layer.
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 Stealthwatch.
Why it's wrong here
Stealthwatch performs network behavior analysis, not DNS filtering.
- ✓
Cisco Umbrella.
Why this is correct
Umbrella provides the DNS-layer security.
- ✗
Cisco ASA Firewall.
Why it's wrong here
ASA is a stateful firewall, not a DNS-security service.
- ✗
Cisco Secure Endpoint.
Why it's wrong here
Protects the host after the connection is made.
Visual reference
About these practice questions
Courseiva writes every SDSI question from scratch — 298 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or 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.