200-201 Security Monitoring Practice Question
A SOC analyst is investigating a potential data exfiltration incident. Which TWO indicators from NetFlow/IPFIX analysis would most strongly suggest data exfiltration?
⚠ Common exam trap
200-201 often tests the difference between C2 beaconing (regular small flows) and exfiltration (large outbound volume) — the trap is picking 'consistent intervals' when the question asks about data exfiltration specifically.
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
✓
Connection to an IP address flagged as malicious in threat intelligence
Option B is correct because a NetFlow/IPFIX record showing a connection to an IP address flagged as malicious by threat intelligence directly ties the flow to known adversary infrastructure, which is a strong contextual indicator of exfiltration (or command-and-control) rather than benign traffic. Option D is correct because a high volume of data transferred outbound to a single external IP address is a classic exfiltration signature — large byte/packet counts in one direction toward an external destination indicate bulk data movement, consistent with stolen data being sent to an attacker-controlled host. Option A is not the strongest indicator here because consistent traffic at regular intervals more typically suggests beaconing/C2 check-ins than bulk exfiltration, and it can also reflect legitimate scheduled traffic. Option C does not belong because multiple connection attempts to various ports on the same external IP is characteristic of port scanning or reconnaissance, not data exfiltration. Option E does not belong because low-volume traffic to multiple external IPs is more consistent with normal web browsing or DNS activity and lacks the volume and concentration expected in exfiltration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Consistent traffic at regular intervals to an external IP
Why it's wrong here
Regular-interval traffic to one external IP can equally indicate heartbeat, polling or scheduled backup, so periodicity alone does not establish exfiltration. It is tempting because beaconing resembles command-and-control, but volume and direction matter. Large outbound transfers relative to inbound, especially to unusual destinations, indicate exfiltration.
- ✓
Connection to an IP address flagged as malicious in threat intelligence
Why this is correct
A flow to an IP listed in threat intelligence links internal traffic to known malicious infrastructure, a strong exfiltration indicator. Unlike volume alone, this reputation match ties the connection to adversary-controlled endpoints, satisfying the requirement for corroborating evidence of compromise.
- ✗
Multiple connection attempts to various ports on the same external IP
Why it's wrong here
Port scanning of one external host reflects reconnaissance, not exfiltration; stolen data flows outward on established channels. It tempts because many destination ports from one source does indicate scanning or worm activity, so this pattern is the right indicator when hunting for internal discovery or pre-attack probing rather than outbound data loss.
- ✓
High volume of data transferred to a single external IP address
Why this is correct
Large outbound transfers to one external address satisfy the exfiltration constraint: NetFlow and IPFIX record byte and packet counts per flow, so a sustained high-volume unidirectional upload to a single foreign IP deviates from normal egress baselines. This concentration distinguishes deliberate exfiltration from routine browsing, which spreads across many destinations.
- ✗
Low volume of traffic to multiple external IPs
Why it's wrong here
Low-volume flows to many external hosts describe scanning or DNS-style fan-out, not bulk exfiltration, which requires sustained outbound transfers. It tempts because beaconing generates small repeated flows, so low volume per destination is the right indicator when hunting for command-and-control check-ins rather than data theft.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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.