Which layer of the OSI (Open Systems Interconnection) 7-layer reference model is responsible for logical IP addressing and end-to-end packet routing?
Answer and explanation
Correct answer: A. Network Layer (Layer 3)
- Step 1: The OSI model organizes networking functions into 7 sequential layers.
- Step 2: Layer 3 (Network Layer) handles logical addressing (IPv4/IPv6), packet fragmentation, and path determination across intermediate networks.
Answer
Network Layer (Layer 3).
Why not the others: 'Data Link Layer' handles physical MAC addressing and frame switching; 'Transport Layer' handles port addressing and reliable delivery (TCP/UDP); 'Physical Layer' handles raw bit transmission over physical media.
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