The answer is to attempt a DNS zone transfer (AXFR). This technique is correct because a misconfigured DNS server that allows recursive queries may also fail to restrict AXFR requests, enabling a client to request a complete copy of the entire DNS zone. By doing so, the tester can enumerate all internal hostnames and IP addresses, effectively mapping the internal network ranges without needing to probe each host individually. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your understanding of DNS reconnaissance and common misconfigurations; a frequent trap is confusing zone transfers with recursive queries, but remember that recursive queries alone do not provide the full zone data. A strong memory tip is to associate AXFR with “All XFR” — as in, transferring all records — and think of it as the DNS equivalent of asking for the entire company phone book.
PT0-002 Practice Question: Information Gathering and Vulnerability Scanning
This PT0-002 practice question tests your understanding of information gathering and vulnerability 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 penetration tester is performing internal reconnaissance. The tester discovers that the internal DNS server allows recursive queries from the tester's machine. Which technique can the tester use to enumerate internal hosts and network ranges?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attempt a DNS zone transfer (AXFR)
B is correct because a DNS zone transfer (AXFR) allows a client to request a complete copy of the DNS zone from a DNS server. If the server is misconfigured to allow recursive queries and does not restrict AXFR requests, the tester can enumerate all internal hostnames and IP addresses, effectively mapping the internal network ranges.
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.
✗
Perform DNS cache snooping
Why it's wrong here
Cache snooping only reveals whether a specific domain has been queried, not internal network structure.
✓
Attempt a DNS zone transfer (AXFR)
Why this is correct
A successful zone transfer gives a complete list of all hosts and subdomains within the zone.
Related concept
Read the scenario before looking for a memorised answer.
✗
Query for all SRV records
Why it's wrong here
SRV records provide service locations but not all hosts; they are limited.
✗
Perform a reverse DNS sweep of the entire subnet
Why it's wrong here
Reverse DNS sweeps are active and may not find all hosts; also less efficient than a zone transfer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the ability to perform recursive queries (which allows resolution of external names) with the ability to perform a zone transfer (which requires explicit AXFR permission), leading them to incorrectly choose DNS cache snooping or SRV record queries instead.
Detailed technical explanation
How to think about this question
A DNS zone transfer (AXFR) is defined in RFC 1034 and 1035, and it uses TCP port 53 to transfer the entire zone file. In a properly secured environment, AXFR should be restricted to authorized secondary DNS servers only; allowing it from any internal host is a critical misconfiguration. Real-world penetration testers often use tools like `dig axfr @dns-server domain.com` or `nmap --script dns-zone-transfer` to exploit this vulnerability.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PT0-002 question in full detail.
Information Gathering and Vulnerability Scanning — This question tests Information Gathering and Vulnerability Scanning — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Attempt a DNS zone transfer (AXFR) — B is correct because a DNS zone transfer (AXFR) allows a client to request a complete copy of the DNS zone from a DNS server. If the server is misconfigured to allow recursive queries and does not restrict AXFR requests, the tester can enumerate all internal hostnames and IP addresses, effectively mapping the internal network ranges.
What should I do if I get this PT0-002 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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