Protocol data unit: Difference between revisions

Revision as of 06:33, 28 August 2020

Revision as of 19:07, 24 September 2020

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{{Short description|Unit of information transmitted between peer entities (at the same layer) of a computer network}}

{{Use American English|date = March 2019}}

{{Use mdy dates|date = March 2019}}

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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 layer ''n-1''<nowiki/>'s PDU can be, itIP mustfragmentation beis brokeninvoked to break it up into multiple payloads tothat fit in the layer-''n-1'' PDU's. This process is called [[IP fragmentation]].

===Internet protocol suite===