Continuing with this analogy, note that Ann and Bill do all their work within
their respective homes; they are not involved, for example, in sorting mail in any
intermediate mail center or in moving mail from one mail center to another. Similarly,
transport-layer protocols live in the end systems. Within an end system, a
transport protocol moves messages from application processes to the network edge
(that is, the network layer) and vice versa, but it doesn’t have any say about how the
messages are moved within the network core. In fact, as illustrated in Figure 3.1,
intermediate routers neither act on, nor recognize, any information that the transport
layer may have added to the application messages.
Continuing with this analogy, note that Ann and Bill do all their work withintheir respective homes; they are not involved, for example, in sorting mail in anyintermediate mail center or in moving mail from one mail center to another. Similarly, transport-layer protocols live in the end systems. Within an end system, atransport protocol moves messages from application processes to the network edge(that is, the network layer) and vice versa, but it doesn’t have any say about how themessages are moved within the network core. In fact, as illustrated in Figure 3.1,intermediate routers neither act on, nor recognize, any information that the transportlayer may have added to the application messages.
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