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350-701 Practice Question: Implementing Cisco Umbrella to provide DNS-layer…
A company is implementing Cisco Umbrella to provide DNS-layer security. They want to block access to known malicious domains while allowing all other traffic. Which policy configuration should be used?
⚠ Common exam trap
Cisco often tests the distinction between DNS-layer security (which uses block lists for domain resolution) and proxy-based security (which inspects full HTTP/HTTPS traffic), leading candidates to mistakenly select proxy options like selective proxy when only DNS-layer blocking is needed.
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
✓
Create a block list with known malicious domains
Cisco Umbrella's DNS-layer security operates by intercepting DNS queries and comparing them against policy-defined lists. A block list containing known malicious domains is the correct approach because Umbrella will block DNS resolution for those domains while allowing all other traffic to pass through normally. This aligns with the requirement to block only malicious destinations without affecting access to legitimate sites.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a block list with known malicious domains
Why this is correct
Block list allows all traffic except specified malicious domains.
- ✗
Enable selective proxy for all traffic
Why it's wrong here
Selective proxy is not a policy type in Umbrella.
- ✗
Create an allow list with only safe domains
Why it's wrong here
That would block all domains not on the list, which is too restrictive.
- ✗
Use a custom policy with both allow and block lists
Why it's wrong here
While possible, it is not the simplest and typically block list is sufficient.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-701 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 350-701 exam.