CND Practice Question: Incident Detection Response And Threat Prediction
During containment of a worm outbreak, an incident response team decides to isolate an infected subnet from the rest of the corporate network. Which containment strategy does this represent?
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
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Network-level containment
Isolating a subnet or segment of the network to prevent propagation while maintaining internal analysis capabilities is a form of network segmentation and physical/logical isolation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Host-level containment
Why it's wrong here
Host-level containment isolates a single endpoint, such as disconnecting a network cable or disabling a virtual NIC.
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Network-level containment
Why this is correct
Network-level containment involves altering routing tables, VLANs, or firewall rules to isolate entire network segments.
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Full enterprise quarantine
Why it's wrong here
Full quarantine involves disconnecting the entire organization from the Internet.
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Application-level containment
Why it's wrong here
Application-level containment stops specific services or processes without network isolation.
Visual reference
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official EC-Council exam blueprint
This CND practice question is part of Courseiva's free EC-Council 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 CND exam.