Answer :
When a network is overloaded and experiencing delays, some packets need to be prioritized in order to prevent random data loss. The class of service (COS) priority is on the left with its corresponding value on the right is given below:
0 - Best effort (default)
1 - Background
2 - Excellent effort
3 - Critical applications
4 - Video (< 100 ms latency)
5 - Voice (< 10ms latency)
6 - Internetwork control
7 - Network control
By categorizing similar types of traffic, such as voice, streaming video, voicemail, and big document file transfers, the class of service (CoS), also known as quality of service (QoS), achieves this prioritizing. Then, you give each group a different level of priority in order to control traffic behaviours like throughput and packet loss.
For example, you can ensure that packet loss happens in accordance with your established rules when it is necessary. CoS also enables you to change the Differentiated Services code point (DSCP), IP precedence, or 802.1p CoS bits of packets leaving a specific interface, allowing you to change outgoing packets to match remote peers' network requirements.
To learn more about COS click here:
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