Protocol Hierarchies • Networks are organized as a stack of layers or levels.
layer is to offer services to • Purpose of each layer higher layers. – Information hiding, abstraction, abstract data type, encapsulation… encapsulation…
Layerr n on one machine carries on a • Laye conversati conv ersation on with lay layer er n on another machine. – Layer n protocol architecture
Protocol Hierarchies Protocol ol is an agreement between the • Protoc communicating parties on how communication is to proceed.
Layers, Protocol and Interfaces
Layers, Protocol and Interfaces • Q: data are directly transferred from layer n on one machine to layer layer n on another an other machine? • Ans: No