- A
Reboot the laptop into safe mode and attempt manual malware removal.
Why wrong: This may destroy useful volatile evidence and does not stop active spread quickly enough.
- B
Quarantine the endpoint from the network through EDR or physical isolation.
Isolating the system immediately contains the ransomware, limits lateral spread, and preserves the device for later investigation. Because the host is still connected to the VPN, it could continue encrypting mapped drives or reach other systems. Containment comes before eradication or recovery, especially when destructive behavior is still active.
- C
Restore the affected files from backup before taking any other action.
Why wrong: Recovery is important, but restoring too early can overwrite evidence and may fail if the threat is still active.
- D
Tell the user to change their password and continue working from the same laptop.
Why wrong: Password changes alone do not stop encryption activity or protect other connected systems from the ongoing compromise.
Quick Answer
The answer is to quarantine the endpoint from the network through EDR or physical isolation. This is the correct immediate action because active ransomware, confirmed by mass file renames and shadow copy deletion in the EDR console, poses an immediate lateral movement risk; isolating the host stops the encryption process from spreading to network shares and cuts communication with the command-and-control server. On the Security+ SY0-701 exam, this scenario tests your understanding of containment as the first step in incident response, often appearing as a trap where candidates might choose to reboot or run an antivirus scan—both of which can destroy volatile evidence or fail to stop active encryption. A key memory tip is “Isolate before you investigate,” reinforcing that ransomware containment quarantine via EDR must precede any recovery or forensic steps.
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 user's laptop suddenly shows encrypted .docx files, a ransom note, and the EDR console reports mass file renames and shadow copy deletion. The device is still online and connected to the corporate VPN. What is the best immediate 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.
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
Quarantine the endpoint from the network through EDR or physical isolation.
Option B is correct because the immediate priority in a confirmed ransomware incident is to contain the threat by isolating the compromised host from the network. The EDR console showing mass file renames and shadow copy deletion indicates active encryption and lateral movement risk. Quarantining via EDR or physically disconnecting the network cable stops the ransomware from encrypting additional shares or communicating with its C2 server, preserving evidence and preventing further damage.
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.
- ✗
Reboot the laptop into safe mode and attempt manual malware removal.
Why it's wrong here
This may destroy useful volatile evidence and does not stop active spread quickly enough.
- ✓
Quarantine the endpoint from the network through EDR or physical isolation.
Why this is correct
Isolating the system immediately contains the ransomware, limits lateral spread, and preserves the device for later investigation. Because the host is still connected to the VPN, it could continue encrypting mapped drives or reach other systems. Containment comes before eradication or recovery, especially when destructive behavior is still active.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Restore the affected files from backup before taking any other action.
Why it's wrong here
Recovery is important, but restoring too early can overwrite evidence and may fail if the threat is still active.
- ✗
Tell the user to change their password and continue working from the same laptop.
Why it's wrong here
Password changes alone do not stop encryption activity or protect other connected systems from the ongoing compromise.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose to restore from backups (Option C) first, not realizing that the infected host must be isolated before any recovery attempt to prevent immediate re-encryption of restored files.
Detailed technical explanation
How to think about this question
Ransomware often uses Windows Volume Shadow Copy Service (VSS) to delete shadow copies via `vssadmin delete shadows /all /quiet`, preventing file recovery without backups. The EDR console's detection of mass file renames (e.g., appending .encrypted) and shadow copy deletion confirms the ransomware is actively executing. Network isolation should be performed at the switch port (802.1X) or via EDR quarantine API to block all SMB (port 445), RDP (3389), and C2 traffic while preserving the host's state for memory forensics.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
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FAQ
Questions learners often ask
What does this SY0-701 question test?
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: Quarantine the endpoint from the network through EDR or physical isolation. — Option B is correct because the immediate priority in a confirmed ransomware incident is to contain the threat by isolating the compromised host from the network. The EDR console showing mass file renames and shadow copy deletion indicates active encryption and lateral movement risk. Quarantining via EDR or physically disconnecting the network cable stops the ransomware from encrypting additional shares or communicating with its C2 server, preserving evidence and preventing further damage.
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.
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Last reviewed: Jun 11, 2026
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