- A
Port scanning, because the source is systematically probing many ports and hosts for exposed services.
This is a classic port scanning pattern. The attacker is checking multiple ports across many systems with short, repeated attempts and no real session establishment. That behavior is consistent with reconnaissance before exploitation.
- B
Reflection-based denial-of-service, because the attacker is using third-party systems to amplify traffic.
Why wrong: Reflection attacks typically involve spoofed traffic and amplification from intermediaries. The logs here show direct probing attempts, not a flood from reflected sources.
- C
Man-in-the-middle, because the attacker is intercepting communications between internal hosts.
Why wrong: A man-in-the-middle attack intercepts or alters active communications. The observed evidence is connection attempts, not interception of established sessions.
- D
Protocol abuse, because the attacker is sending malformed traffic to crash services.
Why wrong: Protocol abuse usually means exploiting protocol weaknesses or malformed requests. The scenario does not show malformed packets or service crashes, only broad scanning behavior.
Quick Answer
The answer is port scanning, specifically a horizontal port scan, because the single external IP is systematically probing multiple TCP ports—22, 80, 139, 445, and 3389—across dozens of internal hosts at regular intervals without delivering any payloads or establishing sessions. This behavior is the hallmark of port scan reconnaissance, where an attacker maps the network by identifying which common service ports are open on which hosts, gathering intelligence for a potential targeted attack. On the Security+ SY0-701 exam, this scenario tests your ability to distinguish reconnaissance from actual exploitation or denial of service; a common trap is confusing it with a brute-force attack, but the lack of repeated login attempts or data transfer rules that out. Remember the key indicator: systematic probing without payloads equals reconnaissance. A useful memory tip is “Probe, no payload—port scan today.”
SY0-701 Threats, Vulnerabilities, and Mitigations Practice Question
This SY0-701 practice question tests your understanding of threats, vulnerabilities, and mitigations. 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.
A firewall analyst reviews logs and sees one external IP address sending connection attempts to TCP ports 22, 80, 139, 445, and 3389 on dozens of internal hosts every few seconds. No payloads are delivered and no sessions are established. What is the most likely activity?
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.
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
Port scanning, because the source is systematically probing many ports and hosts for exposed services.
The observed behavior—a single external IP sending connection attempts to multiple TCP ports (22, 80, 139, 445, 3389) across many internal hosts at regular intervals—is the hallmark of a port scan. The absence of payload delivery or session establishment confirms the attacker is only probing for open services, not attempting exploitation or data transfer. This matches the definition of a reconnaissance activity, specifically a horizontal port scan targeting common service ports.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Port scanning, because the source is systematically probing many ports and hosts for exposed services.
Why this is correct
This is a classic port scanning pattern. The attacker is checking multiple ports across many systems with short, repeated attempts and no real session establishment. That behavior is consistent with reconnaissance before exploitation.
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.
- ✗
Reflection-based denial-of-service, because the attacker is using third-party systems to amplify traffic.
Why it's wrong here
Reflection attacks typically involve spoofed traffic and amplification from intermediaries. The logs here show direct probing attempts, not a flood from reflected sources.
- ✗
Man-in-the-middle, because the attacker is intercepting communications between internal hosts.
Why it's wrong here
A man-in-the-middle attack intercepts or alters active communications. The observed evidence is connection attempts, not interception of established sessions.
- ✗
Protocol abuse, because the attacker is sending malformed traffic to crash services.
Why it's wrong here
Protocol abuse usually means exploiting protocol weaknesses or malformed requests. The scenario does not show malformed packets or service crashes, only broad scanning behavior.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse a port scan with a denial-of-service attack because of the high frequency of connection attempts, but the key distinction is that no sessions are established and no payloads are delivered, which rules out DoS and exploitation.
Trap categories for this question
Command / output trap
Reflection attacks typically involve spoofed traffic and amplification from intermediaries. The logs here show direct probing attempts, not a flood from reflected sources.
Scenario analysis trap
Protocol abuse usually means exploiting protocol weaknesses or malformed requests. The scenario does not show malformed packets or service crashes, only broad scanning behavior.
Detailed technical explanation
How to think about this question
Port scanning tools like Nmap use techniques such as TCP SYN scan (half-open scan) to avoid completing the three-way handshake, which is exactly what the logs show—SYN packets sent to multiple ports without subsequent ACK or RST responses. The choice of ports (22/SSH, 80/HTTP, 139/NetBIOS, 445/SMB, 3389/RDP) is a common fingerprint for attackers seeking remote access or file-sharing services, often used in initial reconnaissance for ransomware or lateral movement. In real-world scenarios, such scans are frequently automated by botnets or vulnerability scanners, and firewalls may log them as 'port scans' with thresholds triggering alerts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
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FAQ
Questions learners often ask
What does this SY0-701 question test?
Threats, Vulnerabilities, and Mitigations — This question tests Threats, Vulnerabilities, and Mitigations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Port scanning, because the source is systematically probing many ports and hosts for exposed services. — The observed behavior—a single external IP sending connection attempts to multiple TCP ports (22, 80, 139, 445, 3389) across many internal hosts at regular intervals—is the hallmark of a port scan. The absence of payload delivery or session establishment confirms the attacker is only probing for open services, not attempting exploitation or data transfer. This matches the definition of a reconnaissance activity, specifically a horizontal port scan targeting common service ports.
What should I do if I get this SY0-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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