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QoS means that a network can provide better service capability for specified network communication by using various basic technologies. It is a security mechanism of the network and a technology used to solve problems such as network delay and congestion.

QoS (Quality of Service) means that a network can provide better service capability for specified network communication by using various basic technologies. It is a security mechanism of the network and a technology used to solve problems such as network delay and congestion. QoS guarantee is very important for capacity-limited networks, especially for streaming multimedia applications such as VoIP and IPTV, because these applications often require fixed transmission rates and are sensitive to delays.

QoS generally provides the following three service models: Best-Effort Service Model, Integrated Service Model (Int-Serv), Differentiated Service Model (Diff-Serv).

1. The Best-Effort service model is a single service model and the simplest service model. For the Best-Effort service model, the network tries to send messages to the maximum extent possible. However, it does not provide any guarantee for performance such as delay and reliability.

The Best-Effort service model is the default service model of the network, implemented through FIFO (first in first out) queues. It is suitable for most network applications, such as FTP, E-Mail, etc.

2. Int-Serv service model Int-Serv is an integrated service model, which can satisfy multiple QoS requirements. This model uses the Resource Reservation Protocol (RSVP), which runs on every device from the source to the destination and monitors each flow to prevent it from consuming too much resources. This architecture can distinguish and guarantee the quality of service of each service flow clearly, and provide the fine-grained quality of service differentiation for the network. However, the Inter-Serv model has high requirements for equipment. When the number of data flows in the network is large, the storage and processing capacity of equipment will encounter great pressure. The Inter-Serv model has poor scalability and is difficult to implement in Internet core networks.

3. Diff-Serv service model is a multi-service model, which can satisfy different QoS requirements. Unlike Int-Serv, it does not need to inform the network to reserve resources for each service. DiffServ is simple to implement and scalable.

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