Protocol_LayeringSupp

Logical communication eg transport take data from app

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Unformatted text preview: nk physical Layering: logical communication E.g.: transport take data from app take add addressing, add reliability check info to form a “packet” send packet to peer send wait for peer to ack wait receipt analogy: post office analogy: data application transport transport network link physical application transport network link physical ack data network link physical data application transport transport network link physical application transport network link physical Layering: the actual physical communication data application transport network link physical application transport network link physical network link physical data application transport network link physical application transport network link physical source datagram Hn Ht message segment Ht M M M M frame Hl Hn Ht application transport network link physical Encapsulation link physical switch destination M Ht Hn Ht Hl Hn Ht M M M application transport network link physical Hn Ht Hl Hn Ht M M network link physical Hn Ht M router Protocol layering and data Each layer takes data from above adds header information to create new data unit adds passes new data unit to layer below passes source M Ht M Hn Ht M Hl Hn Ht M destination application Ht transport Hn Ht network link Hl Hn Ht physical M M M M message segment datagram frame application transport network link physical The importance of being layered Breaks up a complex problem into smaller manageable pieces Breaks can compose simple service to provide comple...
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