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It works on the "application layer", because the data is handled at that layer. However, the information it transfers (distribution of IPs) transcends "layers". BTW, It uses UDP (not TCP), at the "transport layer" on ports 67 and 68.

Edit - "Application" is 7 on the OSI model I believe, but often referred to as a different number with different models

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16y ago

What else can I help you with?