IT Glossary



COS (class of service)

An Internet service provider (ISP) offering that prioritizes which traffic is delivered before other traffic. With COS, when an ISP’s network is not congested, all traffic is treated equally. When the network is congested, however, traffic that has been designated as a higher priority will be delivered first, while lower priority traffic will be held in a queue until the higher-class traffic has been transmitted.


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