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350-701 Practice Question: A security administrator is reviewing firewall…
A security administrator is reviewing firewall logs and notices that an internal user is generating excessive outbound DNS queries to a known malicious domain. The company uses Cisco Umbrella for DNS-layer security. How should the administrator investigate and block this traffic?
⚠ Common exam trap
Cisco often tests the candidate's understanding that DNS-layer security (like Umbrella) is the appropriate tool for blocking malicious domains at the DNS level, rather than using traditional firewall ACLs or reactive measures that do not leverage the solution's policy-based blocking capabilities.
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
✓
Check the Cisco Umbrella dashboard for the domain, identify the internal IP, and block the domain via policy.
Cisco Umbrella is a DNS-layer security solution that can log and block DNS queries to malicious domains. The administrator should first check the Umbrella dashboard to identify the internal IP generating the excessive queries, then create a policy to block the domain, which will prevent all subsequent DNS resolutions to that domain without affecting other traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Check the Cisco Umbrella dashboard for the domain, identify the internal IP, and block the domain via policy.
Why this is correct
Umbrella provides visibility and enforcement at the DNS layer, stopping malicious queries before connection.
- ✗
Create a firewall ACL to block the IP address of the DNS server from the internal user.
Why it's wrong here
Blocking the DNS server would disrupt all DNS, not just the malicious domain.
- ✗
Disable the user's network access temporarily and inform the IT department.
Why it's wrong here
Disabling access is heavy-handed and does not address the root cause.
- ✗
Enable full packet capture on the internal network and wait for the next occurrence.
Why it's wrong here
Reactive and does not immediately block the threat.
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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.