The answer is to capture the WPA2 4-way handshake for offline password cracking. Attackers flood the network with de-authentication packets to force a client to disconnect and then automatically reconnect, which triggers the exchange of the WPA2 4-way handshake. By passively sniffing the air during this forced reconnection, the attacker captures the handshake data, which can then be taken offline and subjected to brute-force or dictionary attacks against the pre-shared key. On the Certified Ethical Hacker CEH exam, this scenario tests your understanding of wireless attack vectors and the specific goal behind de-authentication attacks—a common trap is confusing it with a simple denial-of-service, but the real objective is always credential theft via handshake capture. Remember the memory tip: "De-auth for the handshake, not the headache"—the attack isn't just to disrupt, but to grab the cryptographic exchange for cracking.
CEH Practice Question: Advanced Topics: Wireless, Cloud, IoT, Cryptography
This CEH practice question tests your understanding of advanced topics: wireless, cloud, iot, cryptography. 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 security analyst observes repeated de-authentication packets targeting clients on a corporate Wi-Fi network. What is the MOST likely goal of the attacker?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To capture the WPA2 4-way handshake for offline password cracking
De-authentication attacks force clients to reconnect, allowing the attacker to capture the 4-way handshake for offline cracking of the PSK.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
To perform a denial-of-service attack and disrupt all wireless connectivity
Why it's wrong here
While de-auth can cause DoS, the primary goal in hacking is often to capture handshakes.
✓
To capture the WPA2 4-way handshake for offline password cracking
Why this is correct
De-auth forces reconnection, enabling capture of the handshake if the attacker is running airodump-ng.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✗
To install malware on the client devices
Why it's wrong here
De-auth does not install malware; it disconnects clients.
✗
To exploit a vulnerability in the RADIUS server
Why it's wrong here
De-auth packets don't target RADIUS; they target client-AP communication.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CEH questions on access control and AAA configuration.
Advanced Topics: Wireless, Cloud, IoT, Cryptography — This question tests Advanced Topics: Wireless, Cloud, IoT, Cryptography — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: To capture the WPA2 4-way handshake for offline password cracking — De-authentication attacks force clients to reconnect, allowing the attacker to capture the 4-way handshake for offline cracking of the PSK.
What should I do if I get this CEH question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CEH questions on access control and AAA configuration.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Authentication checks who the user is.
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