The answer is to isolate the workstation from the network using the EDR containment feature. This is correct because the system is actively communicating with a known malicious IP address and disabling security services, which indicates an active command-and-control channel and the potential for lateral movement. Incident containment and isolation via EDR stops that outbound traffic immediately, cutting off the attacker’s foothold before any remediation or forensic analysis begins. On the Security+ SY0-701 exam, this scenario tests your understanding of the incident response process, specifically the priority of containment over eradication. A common trap is to choose “disconnect the network cable” or “shut down the system,” but EDR containment preserves volatile data and allows for remote investigation without alerting the attacker. Remember the memory tip: “C2 first, then fix” — always cut command-and-control traffic before attempting to clean the system.
SY0-701 Threats, Vulnerabilities, and Mitigations Practice Question
This SY0-701 practice question tests your understanding of threats, vulnerabilities, and mitigations. 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 workstation opens an attachment labeled as an invoice and then begins creating scheduled tasks, disabling security services, and contacting a known malicious IP address. What is the best first containment action?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Isolate the workstation from the network using the EDR containment feature
Option B is correct because the workstation is actively communicating with a known malicious IP address and disabling security services, indicating an active compromise. Isolating the workstation via EDR containment immediately stops the outbound command-and-control traffic and prevents lateral movement, which is the priority first step in incident response before any remediation or analysis.
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.
✗
Run a full antivirus scan while leaving the system connected
Why it's wrong here
A scan is useful later, but leaving the host online allows the malware to continue communicating and spreading.
✓
Isolate the workstation from the network using the EDR containment feature
Why this is correct
EDR-based isolation stops command-and-control traffic and limits further spread while preserving the system for investigation.
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.
✗
Reboot the workstation to clear any active malicious processes
Why it's wrong here
A reboot can destroy volatile evidence and may not remove persistence mechanisms such as scheduled tasks.
✗
Uninstall the email client that delivered the attachment
Why it's wrong here
Removing the email client does not contain the active infection already running on the endpoint.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose to run an antivirus scan or reboot first, thinking they can clean the infection, but the exam emphasizes that containment (stopping the spread and C2) is the immediate priority over remediation or removal.
Detailed technical explanation
How to think about this question
EDR containment typically uses a host-based firewall rule or network adapter filter to block all traffic except to the EDR management server, effectively isolating the endpoint at the OSI Layer 3/4 level. This preserves the system state for forensic analysis while stopping C2 traffic, which is critical because modern malware often uses encrypted channels (e.g., HTTPS, DNS tunneling) that antivirus scans cannot block. In a real-world scenario, failing to contain first can lead to ransomware encrypting network shares within minutes of initial execution.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SY0-701 question in full detail.
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: Isolate the workstation from the network using the EDR containment feature — Option B is correct because the workstation is actively communicating with a known malicious IP address and disabling security services, indicating an active compromise. Isolating the workstation via EDR containment immediately stops the outbound command-and-control traffic and prevents lateral movement, which is the priority first step in incident response before any remediation or analysis.
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.
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