Protocol data unit: Difference between revisions

Revision as of 14:55, 19 October 2021

Revision as of 06:34, 18 November 2021

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Given a context pertaining to a specific OSI layer, ''PDU'' is sometimes used as a synonym for its representation at that layer.

When the PDU of one layer (''n''), sent as SDU to the layer one lower than it (''n-1''), plus any metadata ([[Header (computing)|headers]]/[[Trailer (computing)|trailers]]) layer ''n-1'' adds to the SDU would exceed the largest size that layer ''n-1''<nowiki/>'s PDU can be, IP fragmentation is invoked to break it up into multiple payloads that fit in the layer-''n-1'' PDU's.

===Internet protocol suite===