Quick Answer
The answer is Cisco Umbrella, the correct choice because it is a cloud-delivered security solution specifically designed to analyze DNS traffic for malicious activity, including DNS tunneling detection. By intercepting and inspecting every DNS query at the recursive layer, Umbrella can identify anomalous patterns—such as high-frequency queries to unusual domains or abnormally long subdomain strings—that indicate data exfiltration via encoded DNS payloads, then cross-reference these against global threat intelligence to block the traffic. On the Cisco SCOR 350-701 exam, this question tests your understanding of how DNS-layer security fits into a defense-in-depth strategy, often appearing as a scenario where malware uses DNS as a covert channel; a common trap is confusing Umbrella with a network firewall or IPS, which lack the DNS-specific inspection capabilities. Memory tip: think “DNS = Umbrella’s domain,” as it’s the only Cisco solution that operates at the DNS protocol layer to catch tunneling.
This 350-701 practice question tests your understanding of network security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 security team suspects that malware is exfiltrating data by encoding it in DNS queries. Which Cisco security solution is specifically designed to analyze DNS traffic for malicious activity?
Cisco Firepower NGFW
Why wrong: Firepower can inspect DNS but is not the primary solution for DNS tunneling detection.
Cisco Stealthwatch
Why wrong: Stealthwatch analyzes network flows, not specifically DNS payloads.
Cisco Email Security Appliance
Why wrong: ESA focuses on email threats, not DNS.
Cisco Umbrella
Umbrella provides DNS security and can detect tunneling.
Answer choices
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 is a cloud-delivered security solution that provides DNS-layer security by intercepting and analyzing DNS queries. It can detect and block DNS-based data exfiltration techniques, such as DNS tunneling, by inspecting DNS request patterns and comparing them against threat intelligence feeds. This makes it the correct choice for analyzing DNS traffic for malicious activity.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Cisco Firepower NGFW
Why it's wrong here
Firepower can inspect DNS but is not the primary solution for DNS tunneling detection.
Cisco Stealthwatch
Why it's wrong here
Stealthwatch analyzes network flows, not specifically DNS payloads.
Cisco Email Security Appliance
Why it's wrong here
ESA focuses on email threats, not DNS.
Cisco Umbrella
Why this is correct
Umbrella provides DNS security and can detect tunneling.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the distinction between network security appliances that inspect traffic (like Firepower) versus cloud-based DNS security (Umbrella), leading candidates to mistakenly choose Firepower because they think 'DNS traffic analysis' implies a firewall feature.
Detailed technical explanation
DNS tunneling works by encoding data into DNS query fields, such as the QNAME, and exfiltrating it to a malicious authoritative server. Cisco Umbrella uses recursive DNS resolvers to inspect all DNS queries, applying machine learning and threat intelligence to detect anomalies like high query volumes, unusual domain lengths, or non-standard record types (e.g., TXT records). In a real-world scenario, an infected host might send queries like 'exfil1234.malicious.com' to exfiltrate stolen data, which Umbrella can block by identifying the domain as malicious or the pattern as anomalous.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Network Security — This question tests Network Security — Read the scenario before looking for a memorised answer..
The correct answer is: Cisco Umbrella — Cisco Umbrella is a cloud-delivered security solution that provides DNS-layer security by intercepting and analyzing DNS queries. It can detect and block DNS-based data exfiltration techniques, such as DNS tunneling, by inspecting DNS request patterns and comparing them against threat intelligence feeds. This makes it the correct choice for analyzing DNS traffic for malicious activity.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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.
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