The correct first step is to check if the source IP is a legitimate internal scanner before blocking it. This is because blocking an IP without verification could disrupt authorized vulnerability scanning or other legitimate security tools, potentially causing a denial of service to your own defenses. The alert in the SIEM shows an internal IP (10.0.0.5) triggering a scan signature, so the responder must confirm whether that host is an approved scanner, such as a Nessus or Qualys appliance, rather than assuming it is malicious. On the Systems Security Certified Practitioner SSCP exam, this scenario tests the incident response domain, specifically the principle of verifying before acting to avoid unnecessary disruption. A common trap is jumping to block the IP immediately, which the exam uses to see if you prioritize validation over reaction. Remember the memory tip: “Verify before you vilify” — always confirm the source’s authorization before taking irreversible action like blocking.
SSCP Incident Response and Recovery Practice Question
This SSCP practice question tests your understanding of incident response and recovery. 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
ALERT: Port scan detected from IP 10.0.0.5 to multiple ports on internal host 192.168.1.10. Signature ID: 201. Action: Log only.
Refer to the exhibit. A security incident responder sees this alert in the SIEM. What should the responder 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
✓
Check if the source IP is a legitimate internal scanner.
The correct first step is to verify whether the source IP (10.0.0.5) is a legitimate internal scanner (e.g., authorized vulnerability scanner). Option A (blocking) might disrupt legitimate scanning. Option C (rebooting host) is premature. Option D (updating signatures) does not address the immediate alert.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Check if the source IP is a legitimate internal scanner.
Why this is correct
Verifying the source prevents unnecessary action against authorized scanning.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Block the source IP at the firewall.
Why it's wrong here
Blocking without verification could impact legitimate operations.
✗
Update the firewall signature database.
Why it's wrong here
Signature updates are not a response to this specific alert.
✗
Reboot the internal host 192.168.1.10.
Why it's wrong here
Rebooting may disrupt services and does not address the potential scanning.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SSCP NAT questions on configuration and troubleshooting.
Incident Response and Recovery — This question tests Incident Response and Recovery — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Check if the source IP is a legitimate internal scanner. — The correct first step is to verify whether the source IP (10.0.0.5) is a legitimate internal scanner (e.g., authorized vulnerability scanner). Option A (blocking) might disrupt legitimate scanning. Option C (rebooting host) is premature. Option D (updating signatures) does not address the immediate alert.
What should I do if I get this SSCP question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SSCP NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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Question Discussion
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