easyMultiple ChoiceObjective-mapped
ISC2 CC Practice Question: Refer to the exhibit
Exhibit
Feb 12 10:23:45 server1 sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2 Feb 12 10:23:47 server1 sshd[1234]: Failed password for admin from 192.168.1.100 port 22 ssh2 Feb 12 10:23:49 server1 sshd[1234]: Failed password for test from 192.168.1.100 port 22 ssh2 Feb 12 10:23:51 server1 sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2
Refer to the exhibit. Based on the log entries, what type of attack is most likely occurring?
⚠ Common exam trap
ISC2 often tests the distinction between a dictionary attack and a brute-force attack, where candidates mistakenly choose 'brute-force' because they see many failed logins, but the key is whether the attempts use a predefined list (dictionary) versus exhaustive character combinations (brute-force).
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
✓
Dictionary attack.
The log entries show repeated failed login attempts using different usernames and passwords, which is characteristic of a dictionary attack where an attacker uses a list of common usernames and passwords to gain unauthorized access. Unlike a brute-force attack that tries all possible combinations, a dictionary attack uses a predefined list of likely credentials, making it more efficient and matching the pattern in the logs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Brute-force attack.
Why it's wrong here
Brute force usually focuses on many passwords for one username.
- ✓
Dictionary attack.
Why this is correct
Multiple usernames tried suggests a dictionary of common names.
- ✗
Privilege escalation.
Why it's wrong here
Privilege escalation involves gaining higher access, not login attempts.
- ✗
Denial of service.
Why it's wrong here
No indication of service disruption.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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