ly, the system must have a method of giving the message to the receiver. This entails preparing the message for removal from the communications-system upon arrival at its destination (Shelly, Cashman, and Serwatka 144).The Pony Express implemented Transport Layer protocols by providing a post office or telegraph office that received letters from the senders. This post or telegraph office sorted the letters so that they could be sent to their appropriate destinations. At the destination post office or telegraph office, the letter was sent out by mailman to be given to the recipient (Dicerto 12).The job of the OSI Network Layer is to route the message along its path, via intermediate destinations, to its final destination (Shelly, Cashman, and Serwatka 145). While routing the message, the Network Layer functions perform Flow Control; that is, they control the speed of message transmission or transport (Stamper 29). Network Layer functions are also responsible for ensuring that the message will not be tampered with along the route (Stamper 29). In order to implement Flow Control and tamper prevention measures, the Network Layer may need to add information regarding these procedures to the message itself. This additional information will be interpreted by the Network Layer devices, and removed from the original message by these devices (Fortino and Villeneuve 114).In the Pony Express system, implementing Network Layer functions entailed routing the mail to St. Joseph, Missouri, by train from points east. In St. Joseph, the mail was given over to a Pony Express horse and rider (Dicerto 10).What did the Pony Express rider do with the mail? There were 190 stations that spanned the 1,966 miles from St. Joseph to Sacramento. The average distance between stations was 25 miles. The Pony Express rider would bring the mail from one station to the next on the route, until the mail had traveled the entire 1,966-mile distance (Dicerto 15). This one rou...
