Shulou(Shulou.com)06/01 Report--

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Move the machine, play with the system, proficient in the protocol, knock the code.

I would like to make continuous efforts in this way!

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Three models of QOS

Network quality of service (QOS), the implementation of QOS in the network, there are three models to refer to to guide how to implement QOS under various requirements:

Best-Effort Service best effort service model

In the best-effort service model, all network devices do their best to transmit data, all data can be transmitted without permission, how much is transmitted, no data can be guaranteed, and the delay can not be predicted, so the best-effort service model does not implement any QOS, and the default network works under this model.

Integrated Service Integrated Services Model, referred to as Intserv

Before sending data, the application must first apply for bandwidth from the network. When some program traffic needs absolute guarantee of bandwidth, it can guarantee its own traffic by applying for bandwidth in the network of integrated service model. When applying for bandwidth, the protocol used is Resource Reservation Protocol (RSVP). In the integrated service model, important data can be guaranteed by applying for bandwidth, but it must be applied before transmission and it takes some extra time. In the existing network, the QOS of the integrated service model is usually not adopted.

Differentiated Service DiffServ Model, abbreviated as Diffserv

The network will provide different services according to different data, so all data are divided into different categories or set to different priority. When the network is congested, the network always guarantees the transmission of high-priority data first, thus giving up the transmission of low-priority data, but when there is no congestion in the network, all data is transmitted as usual. In QOS, which implements the DiffServ model, the data must be divided into different categories or set to different priorities. In the current network, the DiffServ model is usually used to implement QOS.

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