- A
The workstation is part of a botnet and is communicating with a command-and-control server
Botnets commonly use HTTPS to blend in with normal encrypted web traffic. The large data volume and lack of business need make this the most likely explanation.
- B
A legitimate software update is being downloaded
Why wrong: Software updates typically originate from the workstation contacting update servers, but the description says the workstation should not initiate outbound connections. Also, updates usually have a well-known pattern, and the data is 'sent' (upload) rather than downloaded.
- C
The workstation is acting as a VPN client connecting to a corporate VPN server
Why wrong: A VPN client would connect to an internal or known corporate server, not an arbitrary external IP, and traffic would be expected. The scenario suggests no business need, so VPN is unlikely.
- D
The workstation is hosting a web server that is being accessed externally
Why wrong: If the workstation were a web server, inbound connections would be expected, but the administrator observed outbound connections from the workstation. Also, the workstation is not supposed to serve content.
N10-009 Network Security Practice Question
This N10-009 practice question tests your understanding of network 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.
A security administrator observes that an employee's workstation is sending large amounts of data to an external IP address on TCP port 443. The workstation is not supposed to initiate outbound connections, and there is no business need for it. What 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.
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
The workstation is part of a botnet and is communicating with a command-and-control server
The workstation is sending large amounts of data to an external IP on TCP port 443, which is commonly used for HTTPS traffic. Since the workstation is not authorized to initiate outbound connections and has no business need for this traffic, the most likely cause is that it has been compromised and is part of a botnet, using HTTPS to communicate with a command-and-control (C2) server to evade detection by blending in with legitimate encrypted web traffic.
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.
- ✓
The workstation is part of a botnet and is communicating with a command-and-control server
Why this is correct
Botnets commonly use HTTPS to blend in with normal encrypted web traffic. The large data volume and lack of business need make this the most likely explanation.
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.
- ✗
A legitimate software update is being downloaded
Why it's wrong here
Software updates typically originate from the workstation contacting update servers, but the description says the workstation should not initiate outbound connections. Also, updates usually have a well-known pattern, and the data is 'sent' (upload) rather than downloaded.
- ✗
The workstation is acting as a VPN client connecting to a corporate VPN server
Why it's wrong here
A VPN client would connect to an internal or known corporate server, not an arbitrary external IP, and traffic would be expected. The scenario suggests no business need, so VPN is unlikely.
- ✗
The workstation is hosting a web server that is being accessed externally
Why it's wrong here
If the workstation were a web server, inbound connections would be expected, but the administrator observed outbound connections from the workstation. Also, the workstation is not supposed to serve content.
When this WOULD be correct
In a scenario where a security administrator observes a workstation receiving unsolicited inbound traffic on TCP port 443 from external IPs, and the workstation is not supposed to be a server, then the most likely cause would be that the workstation is hosting a web server that is being accessed externally.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.
✓The workstation is part of a botnet and is communicating with a command-and-control serverCorrect answer▾
Why this is correct
Botnets commonly use HTTPS to blend in with normal encrypted web traffic. The large data volume and lack of business need make this the most likely explanation.
✗The workstation is acting as a VPN client connecting to a corporate VPN serverWrong answer — click to see why▾
Why this is wrong here
The workstation is not supposed to initiate outbound connections, and there is no business need for it, so acting as a VPN client would be an authorized, business-justified activity, not a security concern.
★ When this WOULD be the correct answer
In a scenario where a workstation is configured to connect to a corporate VPN server for remote access, and the security administrator observes outbound traffic on TCP port 443, this would be the correct answer if the VPN uses HTTPS-based encapsulation.
Why candidates choose this
Candidates may confuse outbound HTTPS traffic (port 443) with VPN traffic, especially if they know that some VPNs use port 443 to bypass firewalls, but they overlook the question's context that the workstation should not initiate outbound connections.
✗The workstation is hosting a web server that is being accessed externallyWrong answer — click to see why▾
Why this is wrong here
The workstation is sending data to an external IP on port 443, but hosting a web server would involve inbound connections, not outbound. The question states the workstation initiates outbound connections, which is opposite to a server being accessed externally.
★ When this WOULD be the correct answer
In a scenario where a security administrator observes a workstation receiving unsolicited inbound traffic on TCP port 443 from external IPs, and the workstation is not supposed to be a server, then the most likely cause would be that the workstation is hosting a web server that is being accessed externally.
Why candidates choose this
Candidates may confuse outbound and inbound traffic, or think that port 443 always implies web server activity, without considering the direction of the connection.
Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume TCP 443 always indicates legitimate HTTPS traffic, such as a software update or VPN, without considering that attackers commonly use this port to hide malicious C2 communications, especially when the workstation has no business need for outbound connections.
Trap categories for this question
Scenario analysis trap
A VPN client would connect to an internal or known corporate server, not an arbitrary external IP, and traffic would be expected. The scenario suggests no business need, so VPN is unlikely.
Detailed technical explanation
How to think about this question
Botnets often use HTTPS (TCP 443) for C2 communication to mimic normal web traffic and bypass firewall rules that allow outbound HTTPS. The C2 server may use domain fronting or TLS encryption to further hide the malicious traffic, making it difficult for deep packet inspection (DPI) to distinguish from benign web traffic. In a real-world scenario, a compromised workstation might beacon to a C2 server with periodic HTTPS requests, then exfiltrate data or receive commands, all while appearing as normal web browsing.
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 practitioner preparing for the N10-009 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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this N10-009 question test?
Network Security — This question tests Network Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The workstation is part of a botnet and is communicating with a command-and-control server — The workstation is sending large amounts of data to an external IP on TCP port 443, which is commonly used for HTTPS traffic. Since the workstation is not authorized to initiate outbound connections and has no business need for this traffic, the most likely cause is that it has been compromised and is part of a botnet, using HTTPS to communicate with a command-and-control (C2) server to evade detection by blending in with legitimate encrypted web traffic.
What should I do if I get this N10-009 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 11, 2026
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