The answer is that the SSH server’s MaxAuthTries limit was exceeded. This limit, set to 6 by default in OpenSSH, forces the server to terminate the TCP session after a specific number of failed authentication attempts, which is why the ssh brute force attack stops after the MaxAuthTries limit is reached. The attack stops abruptly on that single connection, but because the limit does not trigger a persistent IP block, the session simply ends without any further blocking action. On the Systems Security Certified Practitioner SSCP exam, this concept tests your understanding of SSH configuration parameters and how they differ from IP-based controls like fail2ban or firewall rules. A common trap is confusing session termination with IP blocking; remember that MaxAuthTries only kills the current connection, not the source address. Memory tip: “MaxAuthTries kills the session, not the source.”
SSCP Security Operations and Administration Practice Question
This SSCP practice question tests your understanding of security operations and administration. 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.
Exhibit
Jan 15 08:30:00 server sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2
Jan 15 08:30:05 server sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2
Jan 15 08:30:10 server sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2
... (repeated 50 times in 5 minutes)
Jan 15 08:35:00 server sshd[1234]: Connection closed by 192.168.1.100 port 22
Refer to the exhibit. A security analyst reviews the log and determines that the system was under a brute force attack. However, the analyst notices that the attack stopped after 5 minutes, and the IP address was not blocked. Which of the following is the MOST likely reason the attack stopped?
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.
Jan 15 08:30:00 server sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2
Jan 15 08:30:05 server sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2
Jan 15 08:30:10 server sshd[1234]: Failed password for root from 192.168.1.100 port 22 ssh2
... (repeated 50 times in 5 minutes)
Jan 15 08:35:00 server sshd[1234]: Connection closed by 192.168.1.100 port 22
A
The SSH server's MaxAuthTries limit was exceeded.
MaxAuthTries causes the connection to close after a set number of failures.
B
The system's account lockout policy prevented further attempts.
Why wrong: Lockout would block the account, but the attacker could still open new connections.
C
The attacker achieved successful login.
Why wrong: No success message appears in the log.
D
The system's firewall dropped the traffic.
Why wrong: Firewall drop would show no connection closed messages.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The SSH server's MaxAuthTries limit was exceeded.
The SSH server's MaxAuthTries limit (default 6 in OpenSSH) causes the server to terminate the connection after a threshold of failed authentication attempts. This stops the attack on that specific TCP session, but does not block the IP address, which explains why the attack ceased after 5 minutes without any persistent block.
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.
✓
The SSH server's MaxAuthTries limit was exceeded.
Why this is correct
MaxAuthTries causes the connection to close after a set number of failures.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The system's account lockout policy prevented further attempts.
Why it's wrong here
Lockout would block the account, but the attacker could still open new connections.
✗
The attacker achieved successful login.
Why it's wrong here
No success message appears in the log.
✗
The system's firewall dropped the traffic.
Why it's wrong here
Firewall drop would show no connection closed messages.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing session-level authentication limits (MaxAuthTries) with persistent account lockout policies or firewall blocks, leading candidates to incorrectly choose account lockout or firewall options.
Trap categories for this question
Command / output trap
Firewall drop would show no connection closed messages.
Detailed technical explanation
How to think about this question
OpenSSH's MaxAuthTries (default 6) is enforced per connection; after the limit, the SSH daemon closes the socket and logs a 'disconnecting: Too many authentication failures' message. This is distinct from MaxStartups (which limits concurrent unauthenticated connections) and from PAM's pam_tally2 or faillock, which implement persistent account lockout. In a real-world scenario, an attacker can simply open a new TCP connection to continue brute-forcing, so MaxAuthTries alone is insufficient against distributed attacks.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Operations and Administration — This question tests Security Operations and Administration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The SSH server's MaxAuthTries limit was exceeded. — The SSH server's MaxAuthTries limit (default 6 in OpenSSH) causes the server to terminate the connection after a threshold of failed authentication attempts. This stops the attack on that specific TCP session, but does not block the IP address, which explains why the attack ceased after 5 minutes without any persistent block.
What should I do if I get this SSCP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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?
Read the scenario before looking for a memorised answer.
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Question Discussion
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