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Class of Service (CoS) is a method used for queuing mechanisms to limit delay and other factors to improve Quality of Service (QoS). Most CoS strategies assign a priority level, usually 0-7 or 0-63, to a frame or packet respectively. Common CoS models include the IP TOS (Type Of Service) byte, Differentiated Services Code Point (DiffServ or DSCP) and the IEEE 802.1p/Q.
Quality of Service involves giving preferential treatment through queuing, bandwidth reservation, or other methods based on attributes of the packet, such as CoS priority. A service quality is then negotiated. Examples of QoS are Asynchronous Transfer Mode (ATM), Real Time Control Protocol P), and Multi Protocol Label Switching (MPLS).
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