The QOS World
Miguel Barreiros, Peter Lundqvist · 2016
Quality of Service (QOS) has always been in a world of its own, but as the technology has been refined and has evolved in recent years, QOS usage has increased to the point where it is now considered a necessary part of network design and operation. QOS can be split into two major components: local operation and resource signaling. The two main standards in the IP realm that are relevant to QOS are the integrated services (IntServ) and the differentiated services (DiffServ). With DiffServ, a router differentiates between various types of traffic by applying a classification process. Per-hop behavior (PHB) obligates the routers to consistently apply the desired behavior to each traffic type that crosses it in spite of its independent decision making. In terms of the parameters used to define the traffic requirements, the more common ones are delay, jitter, and packet loss.