This 350-701 practice question tests your understanding of security concepts. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
Cisco Umbrella's DNS-layer security works by acting as a recursive DNS resolver that checks every query against the Umbrella global threat intelligence database and custom policy lists. When a domain is on the block list, Umbrella returns a sinkhole IP address (e.g., 0.0.0.0 or a redirect to a block page) instead of the real A/AAAA record, effectively preventing the client from connecting to the malicious server. This approach is transparent to users and requires no endpoint software, making it ideal for rapid deployment across all devices on a network.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 350-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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