ISC2 CC Network Security Practice Question
Which firewall type operates at Layer 3 and Layer 4, making decisions based solely on source/destination IP and port numbers?
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
✓
Packet filtering firewall
Packet filtering firewalls are stateless and examine packet headers in 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.
- ✗
Stateful inspection firewall
Why it's wrong here
Stateful firewalls track connection state.
- ✓
Packet filtering firewall
Why this is correct
Packet filtering decisions are based on L3/L4 headers only.
- ✗
Next-generation firewall (NGFW)
Why it's wrong here
NGFWs include application awareness and IPS.
- ✗
Application proxy firewall
Why it's wrong here
Application proxy inspects application layer data.
Go deeper
Related to this question
Learn chapter
Access Control Fundamentals
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
Isolation
Isolation is the process of separating a compromised or suspicious system from a network to prevent the spread of malware or unauthorized access.
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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.