Quick Answer
The answer is to isolate the host from the network. This is the correct first step in ransomware containment because it immediately cuts the infected system’s ability to communicate laterally, preventing the ransomware from encrypting shared drives or spreading to other hosts via network propagation. On the Cisco CyberOps Associate 200-201 exam, this scenario tests your understanding of the containment phase in the NIST incident response framework, where the priority is to stop the attack from expanding before any remediation or recovery steps. A common trap is choosing to reimage the host first, but that fails if the ransomware has already moved to other systems, or notifying management, which is important but not the immediate technical action. Remember the memory tip: “Isolate first, investigate second” — think of cutting the power cord before trying to fix the machine.
This 200-201 practice question tests your understanding of security policies and procedures. 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 security analyst detects a host infected with ransomware on the corporate network. According to incident response procedures, what should be the first action?
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.
Reimage the host immediately
Why wrong: Reimaging without isolation may not stop spread and destroys evidence.
Update antivirus signatures
Why wrong: Updating signatures is proactive but won't contain an active infection.
Notify the IT management team
Why wrong: Notification is part of communication but not the immediate technical response.
Isolate the host from the network
Isolation stops lateral movement and is the first containment step.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Isolate the host from the network
Option A is correct because isolating the host prevents the ransomware from spreading to other systems. Option B is wrong because reimaging without isolation could fail if network propagation continues. Option C is wrong because notifying management is important but not the immediate technical first step. Option D is wrong because updating signatures is a preventive measure, not a containment step.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Reimage the host immediately
Why it's wrong here
Reimaging without isolation may not stop spread and destroys evidence.
Update antivirus signatures
Why it's wrong here
Updating signatures is proactive but won't contain an active infection.
Notify the IT management team
Why it's wrong here
Notification is part of communication but not the immediate technical response.
Isolate the host from the network
Why this is correct
Isolation stops lateral movement and is the first containment step.
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.
Common exam traps
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
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.
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
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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 200-201 NAT questions on configuration and troubleshooting.
Security Policies and Procedures — study guide chapter
Learn the concepts, then practise the questions
Security Policies and Procedures practice questions
Targeted practice on this topic area only
All 200-201 questions
507 questions across all exam domains
Cisco CyberOps Associate 200-201 study guide
Full concept coverage aligned to exam objectives
200-201 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise 200-201 questions linked to Security Policies and Procedures.
Practise 200-201 questions linked to Security Concepts.
Practise 200-201 questions linked to Security Monitoring.
Practise 200-201 questions linked to Host-Based Analysis.
Practise 200-201 questions linked to Network Intrusion Analysis.
Practise 200-201 questions linked to 200-201 fundamentals.
Practise 200-201 questions linked to 200-201 scenario.
Practise 200-201 questions linked to 200-201 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Security Policies and Procedures — This question tests Security Policies and Procedures — Static NAT maps one inside address to one outside address..
The correct answer is: Isolate the host from the network — Option A is correct because isolating the host prevents the ransomware from spreading to other systems. Option B is wrong because reimaging without isolation could fail if network propagation continues. Option C is wrong because notifying management is important but not the immediate technical first step. Option D is wrong because updating signatures is a preventive measure, not a containment 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 200-201 NAT questions on configuration and troubleshooting.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
This 200-201 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-201 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.