CND Network Defense Management Practice Question
A security architect is designing a defense-in-depth strategy for a multi-tier web application. To adhere to the principle of least privilege within network defense lifecycle management, how should firewall rules be structured between the DMZ and the internal application tier?
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
✓
Implicit deny all traffic by default, explicitly permitting only necessary destination ports and IPs
Least privilege requires dropping all traffic by default and explicitly permitting only required ports and IP addresses necessary for business operations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Implicit deny all traffic by default, explicitly permitting only necessary destination ports and IPs
Why this is correct
An explicit allow list with a terminal deny rule enforces strict least privilege.
- ✗
Implement stateful inspection only on inbound perimeter traffic, trusting all outbound traffic
Why it's wrong here
Trusting all outbound traffic leaves internal assets vulnerable to data exfiltration and command-and-control communication.
- ✗
Disable firewall packet filtering on internal interfaces to maximize application throughput
Why it's wrong here
Disabling internal filtering compromises network segmentation.
- ✗
Permit all internal traffic by default, blocking only known malicious signatures
Why it's wrong here
Permitting all traffic by default violates the principle of least privilege.
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.