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 monitoring network traffic and sees a sudden spike in outbound data transfer from an internal server to an external IP that is known to be malicious. What is the most likely scenario?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Software update.
Why wrong: Updates typically come from official vendors, not malicious IPs.
Data exfiltration.
Data exfiltration involves sending sensitive data to an attacker-controlled IP.
User downloading a large file.
Why wrong: Downloads are inbound, not outbound data transfer.
Normal backup operation.
Why wrong: Backups usually go to internal or trusted cloud services, not known malicious IPs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Data exfiltration.
A sudden spike in outbound data transfer from an internal server to a known malicious external IP is a classic indicator of data exfiltration. Attackers often use compromised servers to siphon sensitive data (e.g., credentials, databases) to a command-and-control (C2) server. This behavior aligns with the post-compromise phase of an attack, where the goal is to extract data without triggering immediate alarms.
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.
Software update.
Why it's wrong here
Updates typically come from official vendors, not malicious IPs.
Data exfiltration.
Why this is correct
Data exfiltration involves sending sensitive data to an attacker-controlled IP.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
User downloading a large file.
Why it's wrong here
Downloads are inbound, not outbound data transfer.
Normal backup operation.
Why it's wrong here
Backups usually go to internal or trusted cloud services, not known malicious IPs.
Common exam traps
Cisco often tests the distinction between outbound and inbound traffic direction; candidates may confuse a user downloading a file (inbound) with a server sending data out (outbound), leading them to incorrectly choose option C.
Detailed technical explanation
Data exfiltration often uses protocols like DNS tunneling (exfiltrating data in DNS queries), HTTP/HTTPS POST requests, or FTP to bypass firewalls. In a real-world scenario, an attacker might use a tool like Cobalt Strike to establish a beacon that sends encrypted data chunks to a C2 server, making detection difficult without deep packet inspection (DPI) or NetFlow analysis. The sudden spike in outbound traffic to a single IP is a key behavioral anomaly that security information and event management (SIEM) systems flag as a potential exfiltration event.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: Data exfiltration. — A sudden spike in outbound data transfer from an internal server to a known malicious external IP is a classic indicator of data exfiltration. Attackers often use compromised servers to siphon sensitive data (e.g., credentials, databases) to a command-and-control (C2) server. This behavior aligns with the post-compromise phase of an attack, where the goal is to extract data without triggering immediate alarms.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 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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