Quick Answer
The correct answer is worm. A worm is a standalone malware program that replicates itself across a network by exploiting vulnerabilities or using network protocols like SMB or HTTP, requiring no user interaction such as opening a file or executing a payload. This self-propagation mechanism is what distinguishes worm malware replication from a virus, which needs a host file and user action to spread. On the CompTIA ITF+ FC0-U61 exam, this concept tests your understanding of malware types and their behaviors, often appearing in a multiple-choice question where the trap is confusing a worm with a virus or a Trojan. A useful memory tip: think of a worm as a “network crawler” that moves on its own, while a virus needs a “ride” from a user.
This FC0-U61 practice question tests your understanding of 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.
Which type of malware replicates itself across a network without user interaction?
Virus
Why wrong: A virus requires user interaction (e.g., opening a file) to spread.
Ransomware
Why wrong: Ransomware encrypts files for ransom but usually requires user action to execute.
Worm
Worms self-propagate across networks without human intervention.
Trojan
Why wrong: A Trojan disguises itself as legitimate software but typically does not self-replicate.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Worm
A worm is a standalone malware program that replicates itself across a network by exploiting vulnerabilities or using network protocols (e.g., SMB, HTTP) without requiring any user action, such as opening a file or executing a payload. Unlike a virus, which attaches to a host file and needs user interaction to spread, a worm self-propagates automatically, making it the correct answer for malware that spreads without user interaction.
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.
Virus
Why it's wrong here
A virus requires user interaction (e.g., opening a file) to spread.
Ransomware
Why it's wrong here
Ransomware encrypts files for ransom but usually requires user action to execute.
Worm
Why this is correct
Worms self-propagate across networks without human intervention.
Related concept
Read the scenario before looking for a memorised answer.
Trojan
Why it's wrong here
A Trojan disguises itself as legitimate software but typically does not self-replicate.
Common exam traps
The trap here is that candidates confuse a worm with a virus, assuming both require user interaction, but the key distinction is that a worm self-replicates over a network autonomously, while a virus requires a host file and user action to spread.
Detailed technical explanation
Worms often exploit network services like SMB (Server Message Block) or use buffer overflow vulnerabilities (e.g., EternalBlue in WannaCry) to execute arbitrary code on remote systems without authentication. They can also use email address harvesting and SMTP to send copies of themselves, but the defining characteristic is autonomous propagation via network scanning and payload delivery, often consuming bandwidth and creating traffic anomalies detectable by IDS/IPS systems.
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 FC0-U61 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 — This question tests Security — Read the scenario before looking for a memorised answer..
The correct answer is: Worm — A worm is a standalone malware program that replicates itself across a network by exploiting vulnerabilities or using network protocols (e.g., SMB, HTTP) without requiring any user action, such as opening a file or executing a payload. Unlike a virus, which attaches to a host file and needs user interaction to spread, a worm self-propagates automatically, making it the correct answer for malware that spreads without user interaction.
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 FC0-U61 practice question is part of Courseiva's free CompTIA 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 FC0-U61 exam.
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