The answer is a rainbow table attack, which is the correct choice because this technique leverages precomputed hash chains for common passwords to reverse password hashes with a time-memory trade-off, allowing rapid lookups instead of computing hashes on the fly. On the Certified Ethical Hacker CEH exam, this question tests your understanding of how attackers exploit stored hash databases to bypass brute-force limitations, often appearing in the cryptography or password-cracking domain. A common trap is confusing rainbow tables with brute-force or dictionary attacks, but remember: rainbow tables rely on precomputed chains, not real-time guessing. For a memory tip, think of a rainbow as a pre-made shortcut—just like a rainbow table gives you a fast path from hash to password without recalculating every step.
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.
An attacker uses a tool that precomputes hash chains for common passwords to crack password hashes quickly. Which technique is the attacker employing?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Rainbow table attack
The correct answer is D, Rainbow table attack. This technique involves precomputing hash chains for common passwords and storing them in a table, allowing the attacker to reverse password hashes quickly by looking up the hash in the table rather than computing hashes on the fly. The tool described matches the core concept of a rainbow table, which uses a time-memory trade-off to crack hashes efficiently.
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.
✗
Dictionary attack
Why it's wrong here
A dictionary attack hashes each word from a list and compares against the target hash; it does not use precomputed tables.
✗
Brute-force attack
Why it's wrong here
Brute-force tries all possible combinations; it is slower and does not use precomputed data.
✗
Hybrid attack
Why it's wrong here
A hybrid attack appends/prepends characters to dictionary words; it does not use precomputed tables.
✓
Rainbow table attack
Why this is correct
Rainbow tables use precomputed hash chains to crack hashes quickly.
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 confuse a rainbow table attack with a dictionary attack, because both involve lists of passwords, but the key distinction is precomputation versus real-time hashing.
Detailed technical explanation
How to think about this question
Rainbow tables use reduction functions to create chains of hashes, where each chain starts with a plaintext password and ends with a final hash, storing only the start and end points to save space. When cracking, the attacker applies the reduction function to the target hash and follows the chain until a match is found, then reconstructs the original password. A real-world scenario is cracking NTLM hashes from Windows SAM files, where rainbow tables can be effective if salts are not used, but modern systems often use salted hashes (e.g., in /etc/shadow) to defeat this technique.
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.
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: Rainbow table attack — The correct answer is D, Rainbow table attack. This technique involves precomputing hash chains for common passwords and storing them in a table, allowing the attacker to reverse password hashes quickly by looking up the hash in the table rather than computing hashes on the fly. The tool described matches the core concept of a rainbow table, which uses a time-memory trade-off to crack hashes efficiently.
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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