Computer Networks: Transport Layer

U ovom radu bavimo se transportnim slojem računalne mreže. Analiziramo usluge transportnog sloja, te protokole transportnog sloja. U prvom poglavlju pojašnjavamo gdje se unutar mrežne arhitekture nalazi transportni sloj. U drugom poglavlju detaljno opisujemo usluge i elemente transportnog sloja te probleme s kojima se suočavamo u ovom sloju. U trećem poglavlju dajemo dva primjera protokola transportnog sloja, UDP i TCP. Detaljno opisujemo kako ovi protokoli obavljaju zadatke transportnog sloja i kako izgleda razmjena podataka između dva transportna sloja na dva različita uređaja. U zadnjem poglavlju dajemo primjer nadogradnje UDP protokola kako bi isti imao određene dodatne funkcionalnosti poput pouzdanosti i kontrole toka.In this paper, we deal with the transport layer of the computer network. We analyze transport layer services and transport layer protocols. In the first chapter, we explain where is the transport layer located within the network architecture. In the second chapter, we describe in detail the services and elements of the transport layer and the problems we face in this layer. In the third chapter, we give two examples of transport layer protocols, UDP and TCP. We describe in detail how these protocols perform the tasks of the transport layer and what the data exchange looks like between the two transport layers on two different host devices. In the last chapter, we give an example of upgrading the UDP protocol so that it has certain additional functionalities such as reliability and flow control