The answer is LDAP anonymous query, as it enables enumerating Active Directory users without authentication by exploiting default directory access controls. This technique works because Active Directory, by default, permits unauthenticated LDAP binds to retrieve sensitive attributes like sAMAccountName and userPrincipalName, effectively allowing an attacker to map out user accounts and group memberships through a simple LDAP search filter. On the Certified Ethical Hacker CEH exam, this concept tests your understanding of reconnaissance methods and common misconfigurations; a frequent trap is assuming anonymous queries are always disabled, when in fact many legacy or poorly hardened domains still allow them. Remember that LDAP anonymous enumeration is a low-hanging fruit in penetration testing, often overlooked by administrators who focus only on network-level defenses. A useful memory tip: think of LDAP as a phonebook—if the directory doesn’t lock its front door, anyone can flip through the pages.
CEH Enumeration and System Hacking Practice Question
This CEH practice question tests your understanding of enumeration and system hacking. 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.
A system administrator wants to enumerate all users in an Active Directory domain. Which protocol and query technique should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
LDAP anonymous query
Option D is correct because LDAP anonymous queries allow unauthenticated users to query an Active Directory domain for directory information, including user enumeration. By default, AD permits anonymous LDAP binds to retrieve attributes like sAMAccountName, userPrincipalName, and group memberships, making it a standard technique for enumerating users without credentials.
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.
✗
SNMP with public community string
Why it's wrong here
SNMP enumerates network devices and system info, not AD users.
✗
SMB null session
Why it's wrong here
SMB null sessions can enumerate users but are less common in modern AD; LDAP is the standard protocol.
✗
SMTP VRFY
Why it's wrong here
SMTP VRFY checks email existence, not directory user enumeration.
✓
LDAP anonymous query
Why this is correct
LDAP can query directory services like AD; anonymous queries may reveal basic user info if not restricted.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse SMB null sessions (a deprecated attack) with LDAP anonymous queries (a current, often-valid technique), or they mistakenly think SMTP VRFY is relevant to domain user enumeration instead of email address verification.
Detailed technical explanation
How to think about this question
LDAP anonymous queries work by binding to the LDAP port (389) with a null or empty DN, then issuing a search request against the base DN of the domain (e.g., DC=example,DC=com). The query can retrieve all user objects by filtering on (objectClass=user), and the response includes attributes like distinguishedName and memberOf. In hardened environments, administrators can disable anonymous LDAP binds via the 'dsHeuristics' attribute or by setting the 'LDAP server signing requirements' policy, but many organizations leave it enabled for legacy compatibility.
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 administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Enumeration and System Hacking — This question tests Enumeration and System Hacking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: LDAP anonymous query — Option D is correct because LDAP anonymous queries allow unauthenticated users to query an Active Directory domain for directory information, including user enumeration. By default, AD permits anonymous LDAP binds to retrieve attributes like sAMAccountName, userPrincipalName, and group memberships, making it a standard technique for enumerating users without credentials.
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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