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Class of Service utilizes 8 levels of priority, and modifies the PCP field in an 802.1Q tag.

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  1. 27 May, 01:26
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    True.

    Explanation:

    When there is delay and congestion in the network, we have to assign priority to some packets to avoid data loss. Class of service (CoS) does this prioritization by grouping similar traffic types such as, voice, streaming video, e-mail etc. into classes. then it utilizes different levels (usually eight) of priority. It also modifies PCP field in 802.1q tag.
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