200-201 Security Monitoring Practice Question

Correct answer & explanation

A POST request to login.php with a 200 OK response indicates a successful login attempt. Combined with many similar entries, it could indicate a brute force attack, but the single entry is not suspicious. However, the user-agent 'Mozilla/5.0' is generic and could be normal. The response code 200 is normal for successful login. No anomaly here; the question expects 'None of the above' but not an option. Actually, the most suspicious is possibly the POST method? No. Actually, the entry looks normal. But among options: The URL contains 'login' which is typical. The response code 200 is normal. The user-agent is common. The source IP is internal. So maybe nothing suspicious. However, a key point: The log shows a successful login from internal IP, which could be normal. But if there were many failed attempts, it would be suspicious. Since only one entry, it's not. The question might be tricky. Let me re-evaluate: The stem says 'most suspicious' - but the entry is normal. Perhaps the correct answer is that there is no suspicious activity. But options include 'The POST method is used for login' which is normal. 'The response code 200 indicates success' which is normal. 'The user-agent is generic' which is common. 'The source IP is internal' which could be normal. So maybe the answer is 'The response code 200 indicates successful login'? That's not suspicious. I think the intended answer is that a 200 response to a login POST could indicate successful brute force attempt if many attempts. But here only one. Hmm. Maybe I should focus on the fact that the log shows a successful login to a sensitive page from an internal IP, which could be normal. Actually, the correct answer might be 'The response code 200 indicates successful login' because if there were many similar entries, it would be suspicious. But the question says 'most suspicious' implying one entry. I think the best answer is 'The response code 200 indicates successful login' because it could be part of a brute force attack. But that's weak. Alternatively, maybe the source IP is internal, which is normal. I'll go with the response code being suspicious because it shows success. But let's see options: A) The POST method is used for login - normal. B) The response code 200 indicates successful login - could be suspicious if part of brute force. C) The user-agent is generic - not suspicious. D) The source IP is internal - not suspicious. So B is the best. Explanation: Successful logins after many failures indicate a successful brute force attack. But the log only shows one success. Perhaps the context is that the analyst sees this single entry but knows there were many 401s earlier. However, not stated. I'll stick with B.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.