CEH Footprinting, Reconnaissance and Scanning Practice Question
This CEH practice question tests your understanding of footprinting, reconnaissance and scanning. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 runs the following command: dnsenum --enum example.com. Which of the following actions is dnsenum performing?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attempts a zone transfer and brute-forces subdomains
The `dnsenum` tool is designed for DNS enumeration, and its `--enum` flag performs a comprehensive scan that includes attempting a zone transfer (AXFR query) to retrieve all DNS records from the nameserver, and if that fails, it brute-forces subdomains using a wordlist. This matches option A exactly.
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.
✓
Attempts a zone transfer and brute-forces subdomains
Why this is correct
dnsenum's --enum option attempts a zone transfer and then brute-forces subdomains using a wordlist.
Related concept
Read the scenario before looking for a memorised answer.
✗
Scans for open ports on the DNS server
Why it's wrong here
dnsenum is a DNS enumeration tool, not a port scanner.
✗
Queries the DNS server for its version information
Why it's wrong here
Version query is a separate technique (e.g., nslookup -q=txt version.bind).
✗
Performs a reverse DNS lookup to find PTR records for the IP range
Why it's wrong here
dnsenum does not primarily do reverse lookups; it focuses on forward DNS enumeration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `dnsenum` with other DNS tools like `nslookup` or `dig`, assuming it only performs simple queries, when in fact its `--enum` mode specifically targets zone transfers and subdomain brute-forcing.
Detailed technical explanation
How to think about this question
Under the hood, `dnsenum` first sends an AXFR request to the target domain's authoritative nameserver; if the server is misconfigured to allow zone transfers, it retrieves the entire zone file, revealing all subdomains and IPs. If the AXFR fails, it falls back to brute-forcing subdomains using a built-in or user-supplied wordlist, querying for A, AAAA, and CNAME records. This dual approach makes it a powerful reconnaissance tool for footprinting DNS infrastructure.
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: Attempts a zone transfer and brute-forces subdomains — The `dnsenum` tool is designed for DNS enumeration, and its `--enum` flag performs a comprehensive scan that includes attempting a zone transfer (AXFR query) to retrieve all DNS records from the nameserver, and if that fails, it brute-forces subdomains using a wordlist. This matches option A exactly.
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.
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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