Quick Answer
The answer is a network mapping tool. This is the most likely cause because a systematic port scan targeting multiple ports on a single external IP address is the hallmark behavior of tools like Nmap or Masscan, which are designed to probe for open services and map network topology. In contrast, malware often uses random or sequential scanning across many IPs, while normal user activity generates only a few connections. On the Cisco CyberOps Associate 200-201 exam, this question tests your ability to distinguish between benign reconnaissance and malicious scanning; a common trap is confusing a targeted port scan with a distributed denial-of-service attack. Remember the key distinction: network mapping focuses on service discovery against a single host, not volume-based disruption. Memory tip: “One IP, many ports? That’s a map, not an attack.”
This 200-201 practice question tests your understanding of network intrusion analysis. 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 notices an intrusion alert triggered by an internal host scanning multiple ports on a single external IP address. The signature is 'Port Scan'. Which of the following is the most likely cause?
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.
Misconfigured service
Why wrong: Misconfigured services may cause scanning but not typically to a single external IP.
Malware spreading
Why wrong: Malware often spreads to multiple internal hosts, not a single external IP.
Network mapping tool
Network mapping tools like Nmap perform port scans for reconnaissance.
Normal user activity
Why wrong: Normal users do not perform port scans.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Network mapping tool
A port scan targeting multiple ports on a single external IP is the classic behavior of network mapping tools like Nmap or Masscan. These tools systematically probe ports to discover open services, which is distinct from the random or sequential scanning patterns of malware or the limited connections of normal user 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.
Misconfigured service
Why it's wrong here
Misconfigured services may cause scanning but not typically to a single external IP.
Malware spreading
Why it's wrong here
Malware often spreads to multiple internal hosts, not a single external IP.
Network mapping tool
Why this is correct
Network mapping tools like Nmap perform port scans for reconnaissance.
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.
Normal user activity
Why it's wrong here
Normal users do not perform port scans.
Common exam traps
Cisco often tests the distinction between scanning a single external IP (network mapping) versus scanning many internal IPs (malware spreading), causing candidates to confuse the target scope with the scanning pattern.
Detailed technical explanation
Under the hood, a port scan sends TCP SYN packets to each target port; a SYN-ACK response indicates the port is open, while RST indicates closed. Tools like Nmap can perform stealth SYN scans (-sS) to avoid completing the TCP handshake, reducing log entries. In real-world scenarios, an internal host scanning a single external IP across many ports is often a red team exercise or a misused network discovery tool, not an automated worm.
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 Intrusion Analysis — This question tests Network Intrusion Analysis — Read the scenario before looking for a memorised answer..
The correct answer is: Network mapping tool — A port scan targeting multiple ports on a single external IP is the classic behavior of network mapping tools like Nmap or Masscan. These tools systematically probe ports to discover open services, which is distinct from the random or sequential scanning patterns of malware or the limited connections of normal user activity.
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
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