The answer is to determine the version of a running service. This is the primary purpose of banner grabbing during the reconnaissance phase because service banners typically disclose the software name and exact version number, which an attacker can then cross-reference against public vulnerability databases to identify specific exploits. On the Certified Ethical Hacker CEH exam, this question tests your understanding of active information gathering versus passive footprinting; a common trap is confusing banner grabbing with port scanning, but port scanning only reveals open ports, while banner grabbing reveals the service version. For a quick memory tip, think of the mnemonic "Banner = Version" — if you see a banner, you are looking for the version, not just the port.
CEH Footprinting, Reconnaissance and Scanning Practice Question
This CEH practice question tests your understanding of footprinting, reconnaissance and scanning. 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 of the following is the PRIMARY purpose of banner grabbing during the reconnaissance phase?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To determine the version of a running service
Banner grabbing is a technique used to extract service banners that often include software name and version details. The primary purpose is to determine the version of a running service, as this information allows an attacker to identify known vulnerabilities specific to that version for further exploitation.
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.
✓
To determine the version of a running service
Why this is correct
Banners often include version strings, allowing identification of specific service versions.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
To discover open ports
Why it's wrong here
Port scanning discovers open ports; banner grabbing is performed on already open ports.
✗
To identify the operating system
Why it's wrong here
OS fingerprinting is done via other techniques, though banners sometimes hint at OS.
✗
To map the network topology
Why it's wrong here
Network topology mapping requires multiple techniques, not just banner grabbing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse banner grabbing with OS fingerprinting or port scanning, but the CEH exam specifically tests that banner grabbing's primary goal is service version identification, not OS detection or port discovery.
Detailed technical explanation
How to think about this question
Banner grabbing works by connecting to a service (e.g., HTTP, FTP, SSH) and reading the initial greeting or response string, which often contains the software name and version per RFC standards (e.g., HTTP Server header, FTP 220 banner). In a real-world scenario, an attacker might use netcat or telnet to manually grab banners, or automated tools like nmap's -sV flag, which performs service version detection by sending probes and analyzing responses beyond the initial banner.
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 CEH 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.
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: To determine the version of a running service — Banner grabbing is a technique used to extract service banners that often include software name and version details. The primary purpose is to determine the version of a running service, as this information allows an attacker to identify known vulnerabilities specific to that version for further exploitation.
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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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