ISC2 CC Network Security Practice Question
Which OSI layer is responsible for logical addressing, routing, and forwarding of packets, and where does an IP address operate?
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
✓
Layer 3 – Network
Layer 3 (Network) handles IP addresses, routing, and packet forwarding.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Layer 2 – Data Link
Why it's wrong here
Layer 2 uses MAC addresses and frames, not IP.
- ✗
Layer 1 – Physical
Why it's wrong here
Layer 1 deals with bits and physical media.
- ✓
Layer 3 – Network
Why this is correct
Correct. IP addresses and routing are at Layer 3.
- ✗
Layer 4 – Transport
Why it's wrong here
Layer 4 manages segments and end-to-end communication.
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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.