The system authentication log is the correct source to review for failed SSH logins. This log, typically located at /var/log/auth.log on Debian-based systems or /var/log/secure on Red Hat-based distributions, captures all Pluggable Authentication Module (PAM) events and SSH daemon messages, recording every login attempt—including the source IP address, timestamp, and whether it succeeded or failed. On the Security+ SY0-701 exam, this question tests your ability to identify the appropriate log for authentication troubleshooting, often appearing in scenario-based questions about incident response or unauthorized access. A common trap is confusing the authentication log with the system log (/var/log/messages or /var/log/syslog), which records general system events but not detailed authentication data. Remember the memory tip: “Auth for auth”—when investigating authentication failures, always check the auth log first.
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. 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 Linux server starts showing many failed SSH logins from one source IP address. Which log source should the analyst review first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
This is the best choice because authentication logs record login attempts, failures, and success events. For SSH activity, the auth log or equivalent security log is the most direct place to confirm whether the attempts are real, what accounts were targeted, and whether any successful logon followed the failures. It provides the most useful first evidence for triage.
B
The printer spooler log
Why wrong: Printer logs do not normally record remote login attempts or SSH authentication events.
C
The browser history log
Why wrong: Browser history is unrelated to server-side SSH authentication activity.
D
The backup completion log
Why wrong: Backup logs may show job status, but they do not explain SSH login attempts.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The system authentication log
The system authentication log (e.g., /var/log/auth.log or /var/log/secure) records all SSH login attempts, including failed ones, along with source IP addresses. This is the primary log source for investigating authentication failures on Linux systems, as it captures PAM (Pluggable Authentication Module) events and SSH daemon messages.
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 system authentication log
Why this is correct
This is the best choice because authentication logs record login attempts, failures, and success events. For SSH activity, the auth log or equivalent security log is the most direct place to confirm whether the attempts are real, what accounts were targeted, and whether any successful logon followed the failures. It provides the most useful first evidence for triage.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The printer spooler log
Why it's wrong here
Printer logs do not normally record remote login attempts or SSH authentication events.
✗
The browser history log
Why it's wrong here
Browser history is unrelated to server-side SSH authentication activity.
✗
The backup completion log
Why it's wrong here
Backup logs may show job status, but they do not explain SSH login attempts.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates might confuse system authentication logs with generic system logs (e.g., /var/log/messages) or assume that SSH failures would be recorded in a network-level log, but the exam specifically tests knowledge of Linux authentication logging mechanisms.
Trap categories for this question
Command / output trap
Backup logs may show job status, but they do not explain SSH login attempts.
Detailed technical explanation
How to think about this question
Under the hood, SSH failed login attempts are logged by the sshd daemon via syslog with facility authpriv, typically written to /var/log/auth.log or /var/log/secure. The log entries include timestamps, source IPs, usernames attempted, and failure reasons (e.g., 'Failed password for root from 192.168.1.100 port 22 ssh2'). In a real-world scenario, an analyst might use 'grep' or 'journalctl' to filter these logs and correlate with fail2ban or intrusion detection systems.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SY0-701 question in full detail.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The system authentication log — The system authentication log (e.g., /var/log/auth.log or /var/log/secure) records all SSH login attempts, including failed ones, along with source IP addresses. This is the primary log source for investigating authentication failures on Linux systems, as it captures PAM (Pluggable Authentication Module) events and SSH daemon messages.
What should I do if I get this SY0-701 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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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