lleneuve 113). The device that performs Presentation Layer tasks must do any necessary message formatting. If the message content is to be translated or encrypted, for example, Presentation Layer devices must make the necessary changes to the message (Stamper 28).Pony Express message formatting requirements stated that no packages were to be delivered by the Pony Express, rather only letters and telegraphs would be delivered (Dicerto 5). The reason for this is that bulky or heavy packages would have put a serious hamper on the Pony Express ability to guarantee speedy delivery.The Session Layer of the OSI Model executes the next group of communication- essential functions. Session Layer functions dictate that there must be a point of message transference. At this point, the message will be transferred from the premises of the sender to the premises of the communications system, as well as, to the premises of the receiver from the premises of the communications system. It is the senders/ receivers job to affect this change of premises (Fortino and Villeneuve 113).The Session Layer requirements of the Pony Express specified that an individual must bring his mail or telegraph to the appropriate local station. At this local postal station, the message would be accepted into the mail system (Dicerto 12). It was removed from the system, in order to be delivered to the appropriate party, at a similar station on the opposite shore of the US. One such station was the Alta telegraph station in Sacramento (Dicerto 36).The Transport Layer of the model can be paired with the Session Layer. The Transport Layer is the communication services side of the point of message transference. That is, the Transport Layer protocols state that the communication system must have a method of receiving the message from the sender. In addition, the system, upon receiving the message from the sender, must prepare it to be transported to its correct destination. Similar...
