question : switchport voice vlan untagged

szokpszokp Banned Posts: 17 ■□□□□□□□□□
as we know , command:" switchport voice vlan " has four option , untagged is one of them , as shown in the figure bottom . my quesiton is :without any tag, where could the "COS in 802.1p bits" exist ?

the follow figure come from this book :CCNP_SWITCH_642-813_Official_Certification_Guide.pdf


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