GPEN Advanced Password Attacks Practice Question
During an internal penetration test, you capture a NetNTLMv2 challenge-response hash from a workstation. You attempt to crack it offline using Hashcat, but after several hours with a large wordlist and rules, the hash remains uncracked. Which factor most directly determines the feasibility of cracking this hash?
⚠ Common exam trap
The trap here is attributing cracking difficulty to network or protocol factors, when in reality it is the password's strength that makes the hash resistant to recovery.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The length and complexity of the user's password
The feasibility of cracking a NetNTLMv2 hash offline is fundamentally governed by the password's entropy. NetNTLMv2 uses HMAC-MD5 with the user's NT hash and a server challenge, making it resistant to precomputation and requiring brute-force or dictionary attacks. If the password is long and complex, the search space becomes too large for practical cracking, regardless of hardware or network factors.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The length and complexity of the user's password
Why this is correct
NetNTLMv2 cracking success depends on the entropy of the original password. Longer, more complex passwords exponentially increase the search space, making offline cracking infeasible. Even with large wordlists and rules, a high-entropy password will resist recovery, directly limiting the attack's success.
- ✗
The version of the SMB protocol used during authentication
Why it's wrong here
The SMB protocol version (e.g., SMBv2 or SMBv3) does not alter the NetNTLMv2 hash computation. The challenge-response mechanism remains consistent, and the hash format is the same for cracking purposes. Therefore, the SMB version does not impact the cracking feasibility.
- ✗
The network speed between the attacker and the victim
Why it's wrong here
Network speed affects the capture of the hash, not the offline cracking process. Once the hash is captured, cracking is performed locally and is independent of network conditions. Thus, network speed does not determine the feasibility of cracking the NetNTLMv2 hash.
- ✗
The amount of RAM available on the cracking machine
Why it's wrong here
While RAM can affect the performance of Hashcat, especially with large wordlists and rules, it is not the primary determinant of cracking feasibility. The password's entropy is far more critical; insufficient RAM may slow the process but can be mitigated with optimizations, whereas a strong password cannot be cracked regardless of hardware.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official GIAC exam blueprint
This GPEN practice question is part of Courseiva's free GIAC certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the GPEN exam.