Quick Answer
The answer is NetFlow records from the border router. This data source is most useful to confirm beaconing to a malicious domain because NetFlow captures connection metadata—source and destination IPs, ports, protocols, and timestamps—without relying on DNS resolution, allowing an analyst to see the precise 60-second periodic pattern of outbound flows to the malicious domain, even if the host uses hardcoded IPs or encrypted traffic on port 443. On the Cisco CyberOps Associate 200-201 exam, this question tests your understanding of how different data sources (like DNS logs, proxy logs, or full packet capture) serve distinct investigative roles; a common trap is choosing DNS logs, which only show queries, not the actual connections. Remember the memory tip: “NetFlow reveals the rhythm—DNS only shows the request.”
This 200-201 practice question tests your understanding of security monitoring. 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.
An analyst is investigating a host that is beaconing to a known malicious domain every 60 seconds. The host also shows outbound connections to multiple IPs on port 443. To confirm the beaconing, which data source is most useful?
DNS logs from the internal DNS server.
Why wrong: Only shows DNS queries, not the actual HTTPS connections.
NetFlow records from the border router.
Shows flow timestamps and destinations; reveals periodic connections.
Full packet capture of all outbound traffic.
Why wrong: Too much data; not efficient for pattern detection.
Host-based firewall logs.
Why wrong: May not show historical data; limited to local host.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
NetFlow records from the border router.
NetFlow records from the border router provide aggregated metadata (source/destination IP, port, protocol, timestamps) that can reveal the periodic 60-second beaconing pattern to the malicious domain and the volume of outbound connections on port 443. Unlike DNS logs, NetFlow captures the actual connection attempts regardless of DNS resolution, making it ideal for identifying regular, repetitive outbound flows.
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.
DNS logs from the internal DNS server.
NetFlow records from the border router.
Why this is correct
Shows flow timestamps and destinations; reveals periodic connections.
Related concept
Read the scenario before looking for a memorised answer.
Full packet capture of all outbound traffic.
Why it's wrong here
Too much data; not efficient for pattern detection.
Host-based firewall logs.
Why it's wrong here
May not show historical data; limited to local host.
Common exam traps
Cisco often tests the distinction between DNS logs (which show name resolution) and NetFlow (which shows actual traffic flows), leading candidates to mistakenly choose DNS logs because they associate beaconing with domain names, not realizing that the beaconing is confirmed by the connection pattern itself.
Trap categories for this question
Command / output trap
Only shows DNS queries, not the actual HTTPS connections.
Detailed technical explanation
NetFlow (version 5 or 9) exports flow records that include start and end timestamps, which can be analyzed to detect periodic connections (e.g., every 60 seconds) to a specific IP or domain. The border router sees all outbound traffic, so even if the host uses a different DNS server or hardcoded IPs, the beaconing pattern is visible in the flow data. In contrast, DNS logs only show the initial resolution and may not reflect subsequent connections if the IP is cached.
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
Security Monitoring — This question tests Security Monitoring — Read the scenario before looking for a memorised answer..
The correct answer is: NetFlow records from the border router. — NetFlow records from the border router provide aggregated metadata (source/destination IP, port, protocol, timestamps) that can reveal the periodic 60-second beaconing pattern to the malicious domain and the volume of outbound connections on port 443. Unlike DNS logs, NetFlow captures the actual connection attempts regardless of DNS resolution, making it ideal for identifying regular, repetitive outbound flows.
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 11, 2026
This 200-201 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 200-201 exam.
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