ISC2 CC Network Security Practice Question
A network administrator is implementing a DMZ to host a web server and an email server. Which THREE security best practices should be followed? (Select THREE)
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
✓
Place only public-facing servers (e.g., web, email) in the DMZ.
Proper DMZ design includes: placing only public-facing servers in DMZ, restricting inbound traffic to necessary ports, and preventing direct communication from DMZ to internal network. Using private IPs and disabling firewall are incorrect.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Place only public-facing servers (e.g., web, email) in the DMZ.
Why this is correct
Internal servers should remain in the internal network.
- ✓
Use a firewall to control traffic between the internet, DMZ, and internal network.
Why this is correct
Firewalls enforce segmentation.
- ✗
Configure the DMZ to communicate directly with the internal network without restrictions.
Why it's wrong here
DMZ should be isolated; internal traffic should be strictly controlled.
- ✗
Allow all inbound traffic to the DMZ from the internet for ease of access.
Why it's wrong here
Only necessary traffic should be allowed.
- ✓
Restrict inbound traffic to only required services (e.g., HTTP, SMTP).
Why this is correct
Minimize attack surface.
Go deeper
Related to this question
Learn chapter
Introduction to Security Principles
Key term
Firewall
A firewall is a network security system that monitors and controls incoming and outgoing traffic based on predetermined security rules to protect trusted internal networks from untrusted external networks.
Key term
DMZ
A DMZ (demilitarized zone) is a network segment that sits between an internal private network and the public internet, hosting publicly accessible services while keeping the internal network isolated.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CC practice question is part of Courseiva's free ISC2 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 CC exam.