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In order to increase quality, stability and "tailorability" of data networks the networking community continues to build new technologies and upgrade current systems. But when ISPs try to provide tailored services and expressly offer them over 'best effort' connections to end users, they either cannot solve net neutrality problems or strive for market traffic. This paper focuses only on network protocols, methods, or standards aimed at providing consumers with a customised connection on a public network and referring them to the standards of Differentiated QoS (DQoS). This article contributes to the comprehension of the TCP/IP and ATM standard architectural objectives. First of all, it studies its techno-economic trajectory in order to grasp the success elements. In this manner, it recognizes that although their underlying technological characteristics vary widely and differ, the expectation and objective of all D-QoS standards is to offer a guaranteed connection that consumers may be willing to pay for. As a result, we regard transport layer technologies (for example ATM, Frame Relay), signalling technologies (for instance RSVP), data packet markers (for example IP ToS, WME, QCI), and end-to-end segregation solutions (for instance, leased lines, Network Slicing) as a single cohort. Secondly, by looking at the 5G Network Slicing parallel, we suggest that the commercial performance of Network Slicing can finally seem like that of the previous D-QoS standard despite its intrinsic technological difference with other D-QoS standards. Therefore, we are trying to learn from prior D-QoS trials and recommend the most successful short- and medium-term likelihood of enterprise-based 5G slices inside one service provider domain, and with the most binding level agreements.
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