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*The Layer 3: [[network layer]] PDU is the [[Network packet|packet]].
*The Layer 2: [[data link layer]] PDU is the [[Frame (networking)|frame]].
*The Layer 1: [[physical layer]] PDU is the [[bit]] or, more generally, [[Symbol (data)|symbol]
Given a context pertaining to a specific OSI layer, ''PDU'' is sometimes used as a synonym for its representation at that layer.
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