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Quality of Service (QoS)

Introduction

(Quality of Service) QoS is defined as broad compilation of networking techniques and technologies. The function of QoS is to offer guarantees on the capacity of a network to deliver predictable outcomes. The objective of QoS is to provide prioritize delivery service for the applications that require it by ensuring enough bandwidth, controlling latency, and minimizing data loss (Andrews, 1994, pp 193).

Network traffic is the priority of QoS. Network interface targeted QoS toward a given server or router's performance. A network monitoring system normally is arranged as component of QoS, to ensure that networks are performing at the preferred level (Odlyzko, 1998, pp 23).

QoS is especially necessary for the internet services and applications such as VoIP, video-on-demand and other services. Like Ethernet some networking technologies were not developed to support QoS, making it difficult to deploy QoS solution over internet (Blank, 1993, pp 609).

The need for QoS in the network applies in two areas.

QoS used in mission-critical applications ensure the traffic is not impacted by misbehaving applications using the network.

QoS used in real-time applications such as voice and multimedia, guarantee bandwidth and decrease jitter. This ensures the strength and consistency of existing applications when new applications are added (Braden, et al 1994, pp 1633).

Uses and Benefits of QoS

Network administrators can use QoS to guarantee throughput for mission-critical applications so that their transactions can be processed in an acceptable amount of time. Network administrators can also use QoS to manage User Data Protocol (UDP) traffic. Unlike Transmission Control Protocol (TCP), UDP is an inherently unreliable protocol that does not receive feedback from the network and, therefore, cannot detect network congestion. Network administrators can use QoS to manage the priority of applications that rely on UDP, such as multimedia applications, so that they have the ...