Quality of Service (QoS) is a set of technologies and techniques used to manage network resources and ensure that network traffic is delivered effectively and efficiently. QoS is important in networks where different types of traffic, such as real-time voice and video, are competing for limited bandwidth.
QoS technologies and techniques work by prioritizing different types of traffic and allocating network resources accordingly. For example, a QoS system might give priority to real-time voice and video traffic over less time-sensitive traffic, such as email or web browsing. This ensures that time-sensitive traffic is delivered with minimal delay and disruption.
QoS systems can be implemented at various levels of the network, including the network core, distribution layer, and access layer. At the network core, QoS mechanisms such as traffic shaping and congestion control are used to manage the flow of traffic and prevent network bottlenecks. At the distribution and access layers, QoS technologies such as Quality of Service Marking (QoS Marking) and Access Control Lists (ACLs) are used to identify and prioritize different types of traffic.
QoS is typically implemented in networks that require a high level of performance and reliability, such as enterprise networks and service provider networks. It is also used in networks that support mission-critical applications, such as voice and video conferencing, real-time financial transactions, and remote access.
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