- A
Credential stuffing
Correct. Credential stuffing leverages lists of known username/password pairs from previous breaches. The analyst observed many failed attempts from one source IP, then a successful login, which matches an attacker testing stolen credentials. Even with MFA, the attack may succeed if the attacker has obtained session tokens or uses other techniques.
- B
Brute-force attack
Why wrong: Incorrect. A brute-force attack typically targets a single account with many password guesses. The logs show attempts across multiple usernames, not multiple passwords for one user.
- C
Password spraying
Why wrong: Incorrect. Password spraying uses a few common passwords against many accounts. The pattern here shows many failed attempts for the same username before a success, which is more indicative of credential testing rather than spraying a single password.
- D
Shoulder surfing
Why wrong: Incorrect. Shoulder surfing is an in-person observation technique that would not produce remote login logs from a single IP address. It also would not generate failed attempts.
SY0-701 Threats, Vulnerabilities, and Mitigations Practice Question
This SY0-701 practice question tests your understanding of threats, vulnerabilities, and mitigations. 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 reviews authentication logs and notices multiple failed login attempts using various usernames from a single IP address over several hours. Eventually, a successful login occurs using a username that had many failed attempts. The organization requires multi-factor authentication (MFA). Which type of attack is most likely indicated by this pattern?
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
Credential stuffing
The pattern of multiple failed login attempts using various usernames from a single IP address, followed by a successful login for a username that had many failed attempts, is characteristic of a credential stuffing attack. In this attack, the adversary uses a list of previously compromised username/password pairs (often obtained from data breaches) and attempts them against the target system. The successful login indicates that the attacker found a valid credential pair, which bypasses the MFA requirement only if the attacker also has access to the second factor (e.g., via a phishing or session hijacking attack), but the log pattern itself points to credential stuffing.
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.
- ✓
Credential stuffing
Why this is correct
Correct. Credential stuffing leverages lists of known username/password pairs from previous breaches. The analyst observed many failed attempts from one source IP, then a successful login, which matches an attacker testing stolen credentials. Even with MFA, the attack may succeed if the attacker has obtained session tokens or uses other techniques.
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.
- ✗
Brute-force attack
Why it's wrong here
Incorrect. A brute-force attack typically targets a single account with many password guesses. The logs show attempts across multiple usernames, not multiple passwords for one user.
When this WOULD be correct
A brute-force attack would be correct if the logs showed repeated failed attempts for a single username with many different passwords, eventually succeeding, without MFA or with MFA bypassed.
- ✗
Password spraying
Why it's wrong here
Incorrect. Password spraying uses a few common passwords against many accounts. The pattern here shows many failed attempts for the same username before a success, which is more indicative of credential testing rather than spraying a single password.
When this WOULD be correct
An exam scenario where logs show a single password (e.g., 'Spring2024') attempted against hundreds of usernames over a short period, with no successful login, would indicate password spraying.
- ✗
Shoulder surfing
Why it's wrong here
Incorrect. Shoulder surfing is an in-person observation technique that would not produce remote login logs from a single IP address. It also would not generate failed attempts.
When this WOULD be correct
A question describing an attacker observing a user entering a password in a public place, then using that password to gain unauthorized access, would make shoulder surfing the correct answer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SY0-701 exam frequently reuses these exact scenarios with slightly different constraints.
✓Credential stuffingCorrect answer▾
Why this is correct
Correct. Credential stuffing leverages lists of known username/password pairs from previous breaches. The analyst observed many failed attempts from one source IP, then a successful login, which matches an attacker testing stolen credentials. Even with MFA, the attack may succeed if the attacker has obtained session tokens or uses other techniques.
✗Brute-force attackWrong answer — click to see why▾
Why this is wrong here
A brute-force attack typically tries many passwords for a single username, but the logs show multiple usernames with few attempts each, which is characteristic of credential stuffing or password spraying.
★ When this WOULD be the correct answer
A brute-force attack would be correct if the logs showed repeated failed attempts for a single username with many different passwords, eventually succeeding, without MFA or with MFA bypassed.
Why candidates choose this
Candidates may confuse the high number of failed attempts with brute-force, not realizing that the attack targets multiple usernames rather than a single account.
✗Password sprayingWrong answer — click to see why▾
Why this is wrong here
Password spraying uses a single common password against many usernames, but this question describes multiple failed attempts per username (eventually one succeeds), which is characteristic of credential stuffing where known username/password pairs are tried.
★ When this WOULD be the correct answer
An exam scenario where logs show a single password (e.g., 'Spring2024') attempted against hundreds of usernames over a short period, with no successful login, would indicate password spraying.
Why candidates choose this
Candidates confuse password spraying with credential stuffing because both involve multiple usernames; they overlook the key detail that here each username had many failed attempts (suggesting multiple passwords tried per user).
✗Shoulder surfingWrong answer — click to see why▾
Why this is wrong here
Shoulder surfing involves visually observing a user's screen or keyboard to capture credentials, which does not explain multiple failed login attempts from a single IP address over hours.
★ When this WOULD be the correct answer
A question describing an attacker observing a user entering a password in a public place, then using that password to gain unauthorized access, would make shoulder surfing the correct answer.
Why candidates choose this
Candidates might confuse any credential theft method with shoulder surfing, especially if they overlook the pattern of failed attempts indicating automated attacks rather than direct observation.
Analysis generated from the official SY0-701blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing credential stuffing with password spraying: candidates often pick password spraying because it also uses multiple usernames, but the key differentiator is that credential stuffing uses many attempts per username (as seen in the logs), while password spraying uses one common password per username with long delays between attempts.
Trap categories for this question
Command / output trap
Incorrect. A brute-force attack typically targets a single account with many password guesses. The logs show attempts across multiple usernames, not multiple passwords for one user.
Detailed technical explanation
How to think about this question
Credential stuffing relies on automated tools that replay stolen credentials against APIs or login endpoints, often using HTTP POST requests with JSON or form-encoded data. The attack is effective because users frequently reuse passwords across services; the success rate is typically 0.5–2% per breached credential list. MFA can mitigate this, but if the attacker also compromises the second factor (e.g., via SIM swapping or OTP phishing), the login succeeds.
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
An employee at a financial services firm receives an email that appears to come from the IT helpdesk, asking them to reset their password via a link. The link leads to a convincing fake portal that harvests credentials. Security teams use phishing simulations and security-awareness training to reduce this attack vector. Questions like this test whether you can identify social engineering techniques and appropriate controls.
What to study next
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FAQ
Questions learners often ask
What does this SY0-701 question test?
Threats, Vulnerabilities, and Mitigations — This question tests Threats, Vulnerabilities, and Mitigations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Credential stuffing — The pattern of multiple failed login attempts using various usernames from a single IP address, followed by a successful login for a username that had many failed attempts, is characteristic of a credential stuffing attack. In this attack, the adversary uses a list of previously compromised username/password pairs (often obtained from data breaches) and attempts them against the target system. The successful login indicates that the attacker found a valid credential pair, which bypasses the MFA requirement only if the attacker also has access to the second factor (e.g., via a phishing or session hijacking attack), but the log pattern itself points to credential stuffing.
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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