- A
Immediately block the IP address at the perimeter firewall.
Why wrong: While blocking the malicious IP is a valid containment step, it should not be the first action. The analyst should first determine if any valid accounts were targeted, as a successful logon could have already occurred. Blocking prematurely might also hinder further observation of the attack pattern.
- B
Investigate whether any of the attempted accounts correspond to actual domain users.
This is the correct first step. If any of the random account names match legitimate domain accounts, it indicates a targeted attack and possible credential compromise. Even if no failures are logged, a successful authentication might have been recorded separately. This investigation guides subsequent containment and remediation.
- C
Run a full antivirus scan on the domain controller.
Why wrong: An antivirus scan is not warranted at this point. The logs indicate an authentication attack, not malware activity. Scanning the domain controller would divert resources from addressing the immediate threat and would not prevent the ongoing logon attempts.
- D
Notify the company's legal department for law enforcement involvement.
Why wrong: Legal involvement and reporting to law enforcement may be appropriate later, but it is premature before confirming that the attack is successful or that sensitive data has been accessed. The analyst should first investigate and contain the threat.
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 SOC analyst is reviewing logs from a Windows domain controller and notices a large number of failed logon attempts (Event ID 4625) from a single source IP address within a five-minute window. The account names used are random strings such as "a1b2c3", "x9y8z7", etc. The analyst then checks the source IP and finds it is a known external address from a foreign country. Which of the following is the most appropriate next step for the analyst to take?
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
Investigate whether any of the attempted accounts correspond to actual domain users.
Option B is correct because the analyst must first determine if any of the randomly generated account names match existing domain user accounts. If a match is found, it indicates a targeted password-spraying or brute-force attack against valid accounts, requiring immediate account lockdown and credential reset. This investigation step aligns with the incident response process of identification before containment or escalation.
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.
- ✗
Immediately block the IP address at the perimeter firewall.
Why it's wrong here
While blocking the malicious IP is a valid containment step, it should not be the first action. The analyst should first determine if any valid accounts were targeted, as a successful logon could have already occurred. Blocking prematurely might also hinder further observation of the attack pattern.
- ✓
Investigate whether any of the attempted accounts correspond to actual domain users.
Why this is correct
This is the correct first step. If any of the random account names match legitimate domain accounts, it indicates a targeted attack and possible credential compromise. Even if no failures are logged, a successful authentication might have been recorded separately. This investigation guides subsequent containment and remediation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Run a full antivirus scan on the domain controller.
Why it's wrong here
An antivirus scan is not warranted at this point. The logs indicate an authentication attack, not malware activity. Scanning the domain controller would divert resources from addressing the immediate threat and would not prevent the ongoing logon attempts.
- ✗
Notify the company's legal department for law enforcement involvement.
Why it's wrong here
Legal involvement and reporting to law enforcement may be appropriate later, but it is premature before confirming that the attack is successful or that sensitive data has been accessed. The analyst should first investigate and contain the threat.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may jump to immediate blocking (Option A) as a reflexive security action, but the SY0-701 emphasizes following the incident response process—identify and analyze before containing.
Detailed technical explanation
How to think about this question
Event ID 4625 logs contain the 'Account Name' field, which the analyst can cross-reference with Active Directory using PowerShell cmdlets like Get-ADUser to check for matches. In a password-spraying attack, attackers often use random strings to avoid lockout policies, but if any match a real account, the attacker may have guessed the password or be testing common passwords against valid usernames. Real-world scenarios often involve attackers enumerating valid usernames via LDAP queries before spraying, making this investigation critical for early detection.
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 team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
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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: Investigate whether any of the attempted accounts correspond to actual domain users. — Option B is correct because the analyst must first determine if any of the randomly generated account names match existing domain user accounts. If a match is found, it indicates a targeted password-spraying or brute-force attack against valid accounts, requiring immediate account lockdown and credential reset. This investigation step aligns with the incident response process of identification before containment or escalation.
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.
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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