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NetFlow is a feature that was introduced on Cisco routers around 1996 that provides the ability to collect IP network traffic as it enters or exits an interface. By analyzing the data provided by NetFlow, a network administrator can determine things such as the source and destination traffic, class of service, and the causes of congestion.
Class of service (COS or CoS) is a parameter used in data and voice protocols to differentiate the types of payloads contained in the packet being transmitted. The objective of such differentiation is generally associated with assigning priorities to the data payload or access levels to the telephone call.
The type of service (ToS) field is the second byte of the IPv4 header. It has had various purposes over the years, and has been defined in different ways by five RFCs. [1] Prior to the redefinition, the ToS field could specify a datagram's priority and request a route for low-latency, high-throughput, or highly-reliable service.
Ethernet flow control disturbs the Ethernet class of service (defined in IEEE 802.1p), as the data of all priorities are stopped to clear the existing buffers which might also consist of low-priority data. As a remedy to this problem, Cisco Systems defined their own priority flow control extension to the standard protocol. This mechanism uses ...
Cisco Whitepaper — DiffServ-The Scalable End-to-End Quality of Service Model; ACM SIGCOMM'09 paper-Modeling and Understanding End-to-End Class of Service Policies in Operational Networks: proposes a practical model for extracting DiffServ policies; Cisco: Implementing Quality of Service Policies with DSCP
The server is refusing to service the request because the Request-URI is longer than the server is willing to interpret. [1]: §21.4.12 415 Unsupported Media Type Request body in a format not supported. [1]: §21.4.13 416 Unsupported URI Scheme Request-URI is unknown to the server. [1]: §21.4.14 417 Unknown Resource-Priority
Quality of service (QoS) is the description or measurement of the overall performance of a service, such as a telephony or computer network, or a cloud computing service, particularly the performance seen by the users of the network.
RFC 2211 - Specification of the Controlled-Load Network Element Service; RFC 2212 - Specification of Guaranteed Quality of Service; RFC 2215 - General Characterization Parameters for Integrated Service Network Elements; RFC 2205 - Resource ReSerVation Protocol (RSVP) Cisco.com, Cisco Whitepaper about IntServ and DiffServ