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MGT603 PAST PAPERS
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Nevertheless, it will be significant that we repeat this right here. The oldest (practical) set of service layers is
Provides its high layer. The service determines what duties it’s keen to carry out on behalf of the layer.
Its customers, however say nothing about how these capabilities are carried out. A service is related to an interface
Between the 2 ranges, the decrease stage offers the service and the higher stage is the person of the service.
A protocol, in distinction, is a algorithm governing the dimensions and content material of packets or messages.
Exchanges are carried out by mutual establishments inside a layer. Firms use protocols to implement their service definitions. They’ll freely change their protocol at will, they don’t change the service that customers see. inside right here
Fully copy methodology, service and protocol. In different phrases, providers belong to the interface between the layers, fairly, as described within the protocol.
Corresponding packets despatched between companion firms on totally different machines. It can be crucial to not confuse the 2. Feedback It’s value making an analogy with programming languages. Service is like an summary information sort or an object.
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