The correct answer is to obtain all DNS records for a domain from an authoritative server. This is because a DNS zone transfer, defined in RFC 1034 and 1035 as the AXFR mechanism, is designed to replicate the entire zone file from a primary DNS server to a secondary server, thereby revealing every record—including A, MX, CNAME, and NS entries—without the need for brute-forcing. On the Certified Ethical Hacker CEH exam, this concept tests your understanding of footprinting and reconnaissance, where an attacker uses an improperly configured DNS server to map an organization’s entire network infrastructure in one request. A common trap is confusing zone transfer with a simple DNS query, which only returns a single record; remember that AXFR is a full database dump. Memory tip: “AXFR = All X-Files Revealed.”
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.
What is the PRIMARY purpose of performing a DNS zone transfer?
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 obtain all DNS records for a domain from an authoritative server
DNS zone transfer (AXFR) is a mechanism defined in RFC 1034 and 1035 that allows a secondary DNS server to replicate the entire zone file from a primary authoritative server. The primary purpose is to obtain all DNS records for a domain, which is critical for reconnaissance during the footprinting phase, as it reveals subdomains, mail servers, and other infrastructure without brute-forcing.
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 cache DNS queries locally
Why it's wrong here
Caching is done by resolvers, not via zone transfers.
✓
To obtain all DNS records for a domain from an authoritative server
Why this is correct
Zone transfer provides a complete list of DNS records, which is valuable for mapping a network.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the distinction between a zone transfer (full record replication) and a standard DNS query (single record lookup), so candidates mistakenly choose option C because they confuse reverse lookup with the bulk data retrieval of AXFR.
Detailed technical explanation
How to think about this question
A DNS zone transfer uses the AXFR query type (opcode 0, QTYPE 252) over TCP port 53 to ensure reliable delivery of potentially large zone data. In a real-world scenario, misconfigured DNS servers that allow unrestricted zone transfers to any host are a goldmine for attackers, as tools like dig axfr @ns1.example.com example.com can dump all records, including hidden subdomains and SPF entries, bypassing the need for brute-force enumeration.
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 obtain all DNS records for a domain from an authoritative server — DNS zone transfer (AXFR) is a mechanism defined in RFC 1034 and 1035 that allows a secondary DNS server to replicate the entire zone file from a primary authoritative server. The primary purpose is to obtain all DNS records for a domain, which is critical for reconnaissance during the footprinting phase, as it reveals subdomains, mail servers, and other infrastructure without brute-forcing.
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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