The correct conclusion is that the target is likely running a single web server that handles both HTTP and HTTPS traffic. When Nmap version detection reveals the same service and identical version string, such as 'Apache httpd 2.4.41', on both port 80 and port 443, it strongly suggests a single Apache process is configured to listen on multiple ports, typically using VirtualHost directives to serve both plain HTTP and TLS-encrypted HTTPS. This scenario tests your understanding of how Nmap version detection works across multiple ports and how common web server configurations operate—a frequent concept on the Certified Ethical Hacker CEH exam, where the trap is assuming two separate services must be running just because the ports differ. Remember, identical version strings across ports usually mean one process, not two; the key memory tip is "same version, same server."
CEH Footprinting, Reconnaissance and Scanning Practice Question
This CEH practice question tests your understanding of footprinting, reconnaissance and scanning. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 analyst observes the following Nmap output for a target host: PORT STATE SERVICE 22/tcp open ssh 80/tcp open http 443/tcp open https. The analyst then runs a version detection scan and notices that port 80 reports 'Apache httpd 2.4.41' but port 443 reports 'Apache httpd 2.4.41' as well. What is the MOST likely conclusion?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The target is likely running a single web server that handles both HTTP and HTTPS traffic
Option B is correct because when both port 80 (HTTP) and port 443 (HTTPS) report the same Apache httpd version (2.4.41), it strongly indicates that the same web server process is listening on both ports. Apache httpd can be configured to handle both plain HTTP and TLS-encrypted HTTPS traffic simultaneously, typically using separate VirtualHost directives or a single configuration that binds to both ports. The identical version string makes it unlikely that two separate web server instances are running, as they would often differ in patch level or configuration.
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 target is running two separate web servers on different ports
Why it's wrong here
Could be, but the same version suggests the same server software; however, the presence of both is typical for a web server.
✓
The target is likely running a single web server that handles both HTTP and HTTPS traffic
Why this is correct
Many web servers listen on both ports 80 and 443 for HTTP and HTTPS respectively.
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.
✗
The target is running a reverse proxy that forwards traffic to different backends
Why it's wrong here
Possible but less likely without additional evidence.
✗
The version detection is incorrect due to false positives
Why it's wrong here
Version detection is generally reliable for Apache.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume different ports must mean different servers or a reverse proxy, but the CEH exam expects you to recognize that identical version strings from Nmap -sV indicate a single web server instance handling both protocols.
Detailed technical explanation
How to think about this question
Apache httpd uses a single binary (httpd) that can listen on multiple ports via the Listen directive in httpd.conf. When TLS is enabled, the server uses the same core engine but applies SSL/TLS handshake on port 443 via mod_ssl. Nmap's version detection sends specific probes (e.g., Get / HTTP/1.0) and matches responses against a fingerprint database; identical responses on both ports confirm the same server software. In real-world scenarios, this is common for small-to-medium web servers where a single Apache instance handles both HTTP and HTTPS, often with redirect rules from port 80 to 443.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Footprinting, Reconnaissance and Scanning — This question tests Footprinting, Reconnaissance and Scanning — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The target is likely running a single web server that handles both HTTP and HTTPS traffic — Option B is correct because when both port 80 (HTTP) and port 443 (HTTPS) report the same Apache httpd version (2.4.41), it strongly indicates that the same web server process is listening on both ports. Apache httpd can be configured to handle both plain HTTP and TLS-encrypted HTTPS traffic simultaneously, typically using separate VirtualHost directives or a single configuration that binds to both ports. The identical version string makes it unlikely that two separate web server instances are running, as they would often differ in patch level or configuration.
What should I do if I get this CEH 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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Question Discussion
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