QoS refers to a network that can use various basic technologies to provide better service capabilities for designated network communications. It is a security mechanism of the network and is used to solve problems such as network delay and blocking. technology.
##QoS(Quality of Service) refers to the ability of a network to utilize various basic technologies to provide Designated network communication provides better service capabilities, is a security mechanism of the network, and is a technology used to solve problems such as network delay and blocking. QoS guarantee is very important for networks with limited capacity, especially for streaming multimedia applications, such as VoIP and IPTV, because these applications often require fixed transmission rates and are also sensitive to delay.
Usually QoS provides the following three service models:Best-Effort service (Best-Effort service model), Integrated service (Integrated service model, referred to as Int-Serv), Differentiated service (Differentiated service Service model, referred to as Diff-Serv).
1.Best-EffortThe service model is a single service model and the simplest service model. For the Best-Effort service model, the network tries its best to send messages. However, no guarantee is provided for performance such as latency and reliability.
The Best-Effort service model is the default service model of the network, implemented through FIFO (first in first out) queue. It is suitable for most network applications, such as FTP, E-Mail, etc. 2.Int-ServService model Int-Serv is a comprehensive service model that can meet a variety of QoS requirements. This model uses Resource Reservation Protocol (RSVP), which runs on every device from the source to the destination and can monitor each flow to prevent it from consuming too many resources. This system can clearly distinguish and guarantee the service quality of each business flow, and provide the most fine-grained service quality distinction for the network. However, the Inter-Serv model has high requirements on equipment. When the number of data flows in the network is large, the storage and processing capabilities of the equipment will encounter great pressure. The Inter-Serv model has poor scalability and is difficult to implement in the Internet core network.
3．Diff-ServThe service model is a multi-service model that can meet different QoS requirements. Unlike Int-Serv, it does not need to notify the network to reserve resources for each service. Differentiated services are simple to implement and have good scalability.
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