This CS0-003 practice question tests your understanding of incident response and management. 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.
During a phishing investigation, an employee reports clicking a link and entering credentials. Which of the following should be the first step?
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.
Conduct user awareness training
Why wrong: Training is a long-term prevention, not immediate response.
Block the phishing domain
Why wrong: Blocking the domain helps but does not address the compromised credentials.
Analyze the email headers
Why wrong: Email analysis is important for investigation but not the first containment step.
Reset the employee's password
Immediate password reset mitigates account compromise.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Reset the employee's password
The immediate priority after credential compromise is to secure the account and prevent unauthorized access. Resetting the employee's password (Option D) invalidates the stolen credentials, stopping the attacker from using them to log in. This aligns with the NIST Incident Response Framework's containment phase, which must occur before any remediation or analysis steps.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Conduct user awareness training
Why it's wrong here
Training is a long-term prevention, not immediate response.
Block the phishing domain
Why it's wrong here
Blocking the domain helps but does not address the compromised credentials.
Analyze the email headers
Why it's wrong here
Email analysis is important for investigation but not the first containment step.
Reset the employee's password
Why this is correct
Immediate password reset mitigates account compromise.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the distinction between containment and remediation; the trap here is that candidates choose 'Analyze the email headers' (Option C) because they confuse forensic analysis with the first step of incident response, but the priority must always be to stop active harm before investigating.
Detailed technical explanation
In a real-world scenario, the attacker may have already used the credentials to establish a session or configure mailbox rules (e.g., Outlook inbox rules for forwarding). Resetting the password forces re-authentication and invalidates any existing session tokens or refresh tokens tied to the old password, as per OAuth 2.0 and SAML token revocation mechanisms. This step is often automated via an identity provider (IdP) like Azure AD or Okta to ensure rapid containment across all federated services.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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
Incident Response and Management — This question tests Incident Response and Management — Read the scenario before looking for a memorised answer..
The correct answer is: Reset the employee's password — The immediate priority after credential compromise is to secure the account and prevent unauthorized access. Resetting the employee's password (Option D) invalidates the stolen credentials, stopping the attacker from using them to log in. This aligns with the NIST Incident Response Framework's containment phase, which must occur before any remediation or analysis steps.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This CS0-003 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CS0-003 exam.
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