Service class / Class of Service

What is class of service?
Class of Service (CoS) is a term that describes the process of managing different types of traffic on the network in different ways. Professionals can talk about giving each type of data its own 'service priority' or 'bandwidth' within the system.

To achieve this type of prioritization, systems can use specific tools such as 802.1 Layer 2 tagging, Type of Service (TOS) indicators or differentiated services resources. An example of this is that systems can use Layer 2 of the OSI model to evaluate packets and assign them a class of service that determines how this data is handled in the network.

For example, a network could treat voice data differently than information data in order to maintain crystal clear voice connections. When transmitting data, formats such as image and video can be treated differently than text or alphanumeric data. It's all part of the sophisticated network management and resource allocation for different types of data transfers.

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