- A
Block the sender's email address at the email gateway.
This is correct because blocking the sender at the email gateway prevents any further malicious emails from that source from reaching users, effectively containing the threat at its entry point.
- B
Disable the users' accounts.
Why wrong: This is incorrect because disabling accounts is a drastic step that would halt all user activity, including legitimate work, and it does not directly address the email propagation path.
- C
Perform a forensic analysis of the emails.
Why wrong: This is incorrect because forensic analysis is an investigation step that occurs after containment; performing it first would delay stopping the spread of the attack.
- D
Delete the emails from the users' mailboxes.
Why wrong: This is incorrect because deleting emails only removes the messages from already affected mailboxes but does not prevent new malicious emails from arriving; containing the source is more effective.
Quick Answer
Blocking the sender’s email address at the email gateway is the correct first step to contain a phishing email incident because it immediately stops the attack vector at the perimeter, preventing any further malicious emails from that sender from reaching users. This action aligns with the containment phase of incident response, which prioritizes halting the spread of harm before conducting deeper analysis or remediation. On the Security+ SY0-701 exam, this scenario tests your understanding of the incident response process, specifically the order of operations: contain first, then eradicate and recover. A common trap is to jump to analyzing logs or resetting user passwords, but those steps come after containment. Remember the mnemonic “Block First, Ask Later” — when a confirmed phishing sender is identified, the fastest way to contain is to block at the gateway, not to chase individual inboxes.
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. 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.
A security analyst receives multiple alerts indicating that several users in the finance department clicked a malicious link in an email. The analyst has confirmed the email subject line and sender address. Which of the following is the BEST first step to contain the incident?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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.
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
Block the sender's email address at the email gateway.
Blocking the sender's email address at the email gateway is the best first step because it immediately prevents further malicious emails from that sender from reaching any users, containing the incident at the perimeter. This action stops the spread of the attack without disrupting user productivity or requiring time-consuming analysis, aligning with the priority of containment in incident response.
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.
- ✓
Block the sender's email address at the email gateway.
Why this is correct
This is correct because blocking the sender at the email gateway prevents any further malicious emails from that source from reaching users, effectively containing the threat at its entry point.
Clue confirmation
The clue words "best", "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Disable the users' accounts.
Why it's wrong here
This is incorrect because disabling accounts is a drastic step that would halt all user activity, including legitimate work, and it does not directly address the email propagation path.
- ✗
Perform a forensic analysis of the emails.
Why it's wrong here
This is incorrect because forensic analysis is an investigation step that occurs after containment; performing it first would delay stopping the spread of the attack.
- ✗
Delete the emails from the users' mailboxes.
Why it's wrong here
This is incorrect because deleting emails only removes the messages from already affected mailboxes but does not prevent new malicious emails from arriving; containing the source is more effective.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse containment with eradication or investigation, choosing to delete emails (Option D) or analyze them (Option C) first, when the immediate priority is to stop the attack vector at the gateway to prevent further compromise.
Detailed technical explanation
How to think about this question
Email gateways use SMTP filtering rules, such as sender address blocklists or SPF/DKIM/DMARC checks, to reject messages at the connection level before they reach the user's inbox. Blocking the sender address leverages the gateway's ability to apply a rule that drops all future emails from that address, often using a regex or exact match against the MAIL FROM or Envelope-From header, which is more effective than client-side rules that only affect already-delivered messages.
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 SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
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: Block the sender's email address at the email gateway. — Blocking the sender's email address at the email gateway is the best first step because it immediately prevents further malicious emails from that sender from reaching any users, containing the incident at the perimeter. This action stops the spread of the attack without disrupting user productivity or requiring time-consuming analysis, aligning with the priority of containment in incident response.
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: "best", "first". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This SY0-701 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 SY0-701 exam.
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