The answer is to isolate the domain controller first. This is the correct immediate action because the domain controller is exhibiting clear signs of active compromise: unusual outbound traffic on port 443, which strongly suggests command-and-control (C2) communication, combined with a failed backup due to a volume shadow copy error, a technique attackers use to delete forensic evidence and hinder recovery. In the Systems Security Certified Practitioner SSCP exam, this scenario tests the Containment phase of the incident response process, specifically prioritizing the isolation of a critical identity infrastructure component to stop lateral movement and cut the attacker’s communication channel. A common trap is to focus on restoring backups or scanning the file server, but those actions risk allowing the attacker to spread further or destroy more data while the DC remains a live foothold. Remember the memory tip: “DC first, cut the C2, stop the spread.”
SSCP Incident Response and Recovery Practice Question
This SSCP practice question tests your understanding of incident response and recovery. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You are the incident response lead for a medium-sized financial services company. The company uses a hybrid infrastructure with on-premises servers (Active Directory, file shares, and a SQL database) and cloud services (Office 365, Azure VMs). At 2:00 PM on a Tuesday, the helpdesk receives multiple calls that users cannot access the file shares. Simultaneously, the SOC alerts on unusual outbound traffic from the domain controller (DC) to an external IP on port 443. The DC is also running a scheduled antivirus scan. The file server (FS) shows no signs of compromise but is responding slowly. The backup system reports that last night's backup of the DC failed due to a 'volume shadow copy error'. The backup of the FS succeeded. You need to take immediate action. What should you do FIRST?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Isolate the domain controller from the network.
The domain controller (DC) is showing signs of active compromise: unusual outbound traffic on port 443 (likely C2 communication) and a failed backup due to a volume shadow copy error (indicating attempted destruction of forensic evidence). Isolating the DC first stops the attacker's command-and-control channel and prevents lateral movement, which is the highest priority in incident response. Running a scan or restoring other systems before containment risks allowing the attacker to spread or destroy more data.
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 malware scan on the domain controller.
Why it's wrong here
Scanning may alert the attacker and does not stop data exfiltration.
✗
Restore the file server from last night's backup.
Why it's wrong here
The file server is not confirmed compromised; focus on the DC.
✓
Isolate the domain controller from the network.
Why this is correct
Immediate containment stops the attack and preserves evidence.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable the domain controller's antivirus to improve performance.
Why it's wrong here
This could allow further malware activity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates see a failed backup and slow file server and jump to recovery actions (restore or scan), failing to recognize that the DC's outbound traffic and VSS error are the highest-priority indicators of an active breach requiring immediate containment.
Detailed technical explanation
How to think about this question
The volume shadow copy (VSS) error on the DC is a classic indicator of ransomware or attacker activity, as many threats delete or corrupt shadow copies to prevent recovery. Outbound traffic on port 443 from a DC is suspicious because domain controllers typically do not initiate outbound HTTPS connections to unknown external IPs—this is often a beacon to a C2 server. Isolating the DC (e.g., by disconnecting its network cable or blocking its VLAN at the switch) preserves volatile evidence in memory and disk for later forensic analysis while stopping the attack in progress.
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.
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.
Incident Response and Recovery — This question tests Incident Response and Recovery — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Isolate the domain controller from the network. — The domain controller (DC) is showing signs of active compromise: unusual outbound traffic on port 443 (likely C2 communication) and a failed backup due to a volume shadow copy error (indicating attempted destruction of forensic evidence). Isolating the DC first stops the attacker's command-and-control channel and prevents lateral movement, which is the highest priority in incident response. Running a scan or restoring other systems before containment risks allowing the attacker to spread or destroy more data.
What should I do if I get this SSCP 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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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