Quick Answer
The answer is NetBIOS enumeration using nbtstat and LDAP enumeration. NetBIOS enumeration is valid because the nbtstat utility queries the NetBIOS name table over TCP/IP, revealing computer names, logged-in users, and domain membership—information that attackers harvest during reconnaissance. LDAP enumeration is equally valid, as it involves querying a directory service like Active Directory with tools such as ldapsearch to extract user lists, group memberships, and organizational units, often without authentication. On the Certified Ethical Hacker CEH exam, this question tests your ability to distinguish active enumeration techniques from passive footprinting; a common trap is confusing LDAP enumeration with DNS zone transfers or SNMP sweeps. Remember that both NetBIOS and LDAP rely on specific service ports (137-139 and 389) and are frequently paired in internal network scans. Memory tip: “Net and LDAP, the enumeration trap”—if the tool queries a service for structured data, it’s enumeration, not just scanning.
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.
Which TWO of the following are valid enumeration techniques? (Select 2)
LDAP enumeration
LDAP enumeration queries directory services.
NetBIOS enumeration using nbtstat
nbtstat is used for NetBIOS enumeration.
ARP poisoning
Why wrong: ARP poisoning is a man-in-the-middle attack.
DNS cache poisoning
Why wrong: DNS cache poisoning is an attack to redirect traffic.
ICMP flooding
Why wrong: ICMP flooding is a denial-of-service attack, not enumeration.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
LDAP enumeration
LDAP enumeration is a valid enumeration technique because it involves querying a Lightweight Directory Access Protocol (LDAP) service to extract information about users, groups, computers, and other objects from a directory service like Microsoft Active Directory. Attackers use tools such as ldapsearch or ADExplorer to anonymously or authenticatedly browse the directory tree, revealing usernames, group memberships, and organizational units, which are critical for planning further attacks.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
LDAP enumeration
Why this is correct
LDAP enumeration queries directory services.
Related concept
Read the scenario before looking for a memorised answer.
NetBIOS enumeration using nbtstat
Why this is correct
nbtstat is used for NetBIOS enumeration.
Related concept
Read the scenario before looking for a memorised answer.
ARP poisoning
Why it's wrong here
ARP poisoning is a man-in-the-middle attack.
DNS cache poisoning
Why it's wrong here
DNS cache poisoning is an attack to redirect traffic.
ICMP flooding
Why it's wrong here
ICMP flooding is a denial-of-service attack, not enumeration.
Common exam traps
EC-Council often tests the distinction between active reconnaissance techniques (like enumeration) and attack techniques (like ARP poisoning or DoS), so candidates mistakenly select options that are network attacks rather than information-gathering methods.
Detailed technical explanation
LDAP enumeration leverages the fact that many directory services allow anonymous binds or simple authenticated queries, exposing the directory tree structure via LDAP port 389 (or 636 for LDAPS). Tools like ldapsearch use the LDAP protocol's search operation with filters such as '(objectClass=user)' to dump all user objects, revealing attributes like sAMAccountName, userPrincipalName, and memberOf, which are invaluable for privilege escalation or lateral movement in a Windows domain. NetBIOS enumeration using nbtstat works by querying the NetBIOS name service (UDP port 137) to retrieve the NetBIOS name table of a remote machine, revealing logged-in users, domain memberships, and services running, which is a classic Windows-centric reconnaissance step.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Enumeration and System Hacking — This question tests Enumeration and System Hacking — Read the scenario before looking for a memorised answer..
The correct answer is: LDAP enumeration — LDAP enumeration is a valid enumeration technique because it involves querying a Lightweight Directory Access Protocol (LDAP) service to extract information about users, groups, computers, and other objects from a directory service like Microsoft Active Directory. Attackers use tools such as ldapsearch or ADExplorer to anonymously or authenticatedly browse the directory tree, revealing usernames, group memberships, and organizational units, which are critical for planning further attacks.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
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Variation 1. Which TWO of the following are enumeration techniques?
easyWhy C: Options C and D are correct. LDAP enumeration and SMTP enumeration are both enumeration techniques used to gather information about users, systems, or services.
Last reviewed: Jun 30, 2026
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