The answer is immediate network isolation, specifically using EDR containment or switch quarantine. This is the best immediate containment action for active ransomware because it severs the workstation’s Layer 2 connectivity, stopping file renaming, lateral spread, and command-and-control communication while preserving volatile memory for forensic analysis—unlike powering off, which can trigger destructive payloads and destroy evidence. On the Security+ SY0-701 exam, this scenario tests your understanding of incident response priorities under CompTIA’s “containment, eradication, recovery” framework; a common trap is choosing to power off the system, which seems intuitive but violates forensic best practices. Remember the mnemonic “Isolate, don’t annihilate”—cut the network link first, never pull the plug.
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.
Exhibit
EDR event timeline:
14:02:11 excel.exe spawned powershell.exe with -enc parameter
14:02:13 powershell.exe created scheduled task: "OneDrive Update"
14:02:18 explorer.exe began renaming multiple .docx files to .lock
14:02:21 outbound HTTPS connection to 198.51.100.77:443
14:02:24 security service attempted to terminate, then recovered
Based on the exhibit, what is the BEST immediate containment action?
The workstation is still powered on, and the user reports that files are being renamed and the system is running very slowly. The security analyst confirms malicious activity is in progress.
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.
EDR event timeline:
14:02:11 excel.exe spawned powershell.exe with -enc parameter
14:02:13 powershell.exe created scheduled task: "OneDrive Update"
14:02:18 explorer.exe began renaming multiple .docx files to .lock
14:02:21 outbound HTTPS connection to 198.51.100.77:443
14:02:24 security service attempted to terminate, then recovered
A
Immediately isolate the endpoint from the network using EDR containment or switch quarantine.
The device is actively exhibiting ransomware-like behavior, and isolation stops lateral spread and additional command-and-control traffic while preserving the powered-on system for later review.
B
Power off the workstation immediately to prevent any further file changes.
Why wrong: Shutting down can interrupt the malware, but it also destroys volatile evidence and is usually not the first choice when containment can be achieved remotely.
C
Uninstall Microsoft Office so the malicious spreadsheet cannot launch again.
Why wrong: Removing the office suite does not contain the incident in real time and does not stop current encryption or outbound malicious traffic.
D
Block the destination IP address at the firewall and wait for the user to log off.
Why wrong: Blocking one destination may help, but waiting leaves the compromised host connected and capable of spreading or encrypting additional data.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Immediately isolate the endpoint from the network using EDR containment or switch quarantine.
Option A is correct because the immediate priority is to stop the active malicious activity (file renaming, system slowdown) by severing the workstation's network connectivity. EDR containment or switch quarantine isolates the endpoint at Layer 2, preventing the attacker from exfiltrating data, communicating with command-and-control servers, or spreading laterally, while preserving volatile memory for forensic analysis. This is faster and more controlled than powering off, which destroys evidence and may trigger destructive payloads.
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 isolate the endpoint from the network using EDR containment or switch quarantine.
Why this is correct
The device is actively exhibiting ransomware-like behavior, and isolation stops lateral spread and additional command-and-control traffic while preserving the powered-on system for later review.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Power off the workstation immediately to prevent any further file changes.
Why it's wrong here
Shutting down can interrupt the malware, but it also destroys volatile evidence and is usually not the first choice when containment can be achieved remotely.
✗
Uninstall Microsoft Office so the malicious spreadsheet cannot launch again.
Why it's wrong here
Removing the office suite does not contain the incident in real time and does not stop current encryption or outbound malicious traffic.
✗
Block the destination IP address at the firewall and wait for the user to log off.
Why it's wrong here
Blocking one destination may help, but waiting leaves the compromised host connected and capable of spreading or encrypting additional data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between containment (stopping the spread) and eradication (removing the threat), tempting candidates to choose power-off or uninstall actions that destroy evidence or fail to stop active malicious processes.
Detailed technical explanation
How to think about this question
EDR containment typically uses a host-based firewall rule or agent-driven network stack isolation to drop all inbound/outbound traffic except to the management server, while switch quarantine (e.g., 802.1X or MAC address lockdown) blocks the port at the switch level. This preserves the system state for memory acquisition and forensic analysis, unlike power-off which loses kernel and process artifacts. In real-world incidents, ransomware often uses multiple C2 channels, so IP blocking alone is insufficient—the endpoint must be isolated at Layer 2 to prevent all communication.
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.
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: Immediately isolate the endpoint from the network using EDR containment or switch quarantine. — Option A is correct because the immediate priority is to stop the active malicious activity (file renaming, system slowdown) by severing the workstation's network connectivity. EDR containment or switch quarantine isolates the endpoint at Layer 2, preventing the attacker from exfiltrating data, communicating with command-and-control servers, or spreading laterally, while preserving volatile memory for forensic analysis. This is faster and more controlled than powering off, which destroys evidence and may trigger destructive payloads.
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". 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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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Based on the exhibit, what is the MOST likely activity taking place on the network?
A user opened a spreadsheet shortly before unusual internal connection patterns began. The same account is now authenticating to many hosts in rapid succession.
hard
A.A worm is flooding the network with broadcast traffic and exhausting bandwidth.
✓ B.An attacker is performing lateral movement using stolen credentials and remote administration tools.
C.A malicious insider is exfiltrating data through a cloud sync application.
D.A misconfigured printer is repeatedly scanning the subnet for available services.
Why B: The exhibit shows a user opening a spreadsheet (likely a phishing vector) followed by rapid authentication attempts from the same account to many hosts. This pattern matches lateral movement using stolen credentials, where an attacker uses remote administration tools like PsExec, WinRM, or RDP to move across the network after initial compromise.
Last reviewed: Jun 30, 2026
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