- A
Increase the account lockout threshold to a lower number
Why wrong: This would lock accounts more quickly but does not address the core issue: the attacker uses many different usernames. Locking accounts faster does not prevent the attacker from moving to the next username.
- B
Implement geofencing to block traffic from the attacker's region
Why wrong: Geofencing restricts access based on geographic location, but it does not stop a determined attacker who may use a VPN or proxy. It is not a direct mitigation for brute force attacks across usernames.
- C
Configure rate limiting per source IP address
Rate limiting on the application or firewall level restricts the number of authentication attempts from a single IP address over a given time period, regardless of the username being tried. This directly counters the attacker's strategy of rotating usernames to bypass account lockout.
- D
Enable detailed failed login attempt logging
Why wrong: While logging helps with detection and forensic analysis, it does not prevent the attack from continuing. The analyst already observed the attempts; proactive controls like rate limiting are needed.
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 detects a high volume of failed authentication attempts from IP address 203.0.113.1 against a web application. The attempts use different usernames, such as 'admin', 'root', 'test', and several common names. Account lockout policies are configured to lock an account after five failed attempts. Despite this, the analyst sees the attempts continuing over several hours. Which of the following security controls is most likely missing or improperly configured?
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 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
Configure rate limiting per source IP address
Rate limiting per source IP address is the correct control because it restricts the number of authentication requests from a single IP (203.0.113.1) within a given time window, regardless of the usernames used. Account lockout policies are ineffective here because the attacker is rotating through different usernames (e.g., 'admin', 'root', 'test'), so no single account reaches the five-failed-attempt threshold. By limiting the request rate from the source IP, the analyst can throttle the attacker's brute-force attempts without affecting legitimate users.
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.
- ✗
Increase the account lockout threshold to a lower number
Why it's wrong here
This would lock accounts more quickly but does not address the core issue: the attacker uses many different usernames. Locking accounts faster does not prevent the attacker from moving to the next username.
- ✗
Implement geofencing to block traffic from the attacker's region
Why it's wrong here
Geofencing restricts access based on geographic location, but it does not stop a determined attacker who may use a VPN or proxy. It is not a direct mitigation for brute force attacks across usernames.
- ✓
Configure rate limiting per source IP address
Why this is correct
Rate limiting on the application or firewall level restricts the number of authentication attempts from a single IP address over a given time period, regardless of the username being tried. This directly counters the attacker's strategy of rotating usernames to bypass account lockout.
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.
- ✗
Enable detailed failed login attempt logging
Why it's wrong here
While logging helps with detection and forensic analysis, it does not prevent the attack from continuing. The analyst already observed the attempts; proactive controls like rate limiting are needed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume account lockout policies are sufficient for all brute-force attacks, but they fail to recognize that rotating usernames (a 'password spraying' attack) bypasses per-account lockout, making per-source-IP rate limiting the correct mitigation.
Detailed technical explanation
How to think about this question
Rate limiting is typically implemented at the web application firewall (WAF) or reverse proxy layer (e.g., Nginx, HAProxy, or AWS WAF) using a token bucket or leaky bucket algorithm. For example, a rule might allow 10 requests per minute per source IP; exceeding that triggers a 429 Too Many Requests response or a temporary block. In a real-world scenario, attackers often use distributed botnets to bypass single-IP rate limiting, so combining rate limiting with CAPTCHA or device fingerprinting is recommended for robust protection.
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.
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FAQ
Questions learners often ask
What does this SY0-701 question test?
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: Configure rate limiting per source IP address — Rate limiting per source IP address is the correct control because it restricts the number of authentication requests from a single IP (203.0.113.1) within a given time window, regardless of the usernames used. Account lockout policies are ineffective here because the attacker is rotating through different usernames (e.g., 'admin', 'root', 'test'), so no single account reaches the five-failed-attempt threshold. By limiting the request rate from the source IP, the analyst can throttle the attacker's brute-force attempts without affecting legitimate users.
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: "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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Last reviewed: Jun 11, 2026
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