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[单选] VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link .How does ERS use the VLAN tag?()

A . provide service internetworking
B . support transparency for Layer 2 frames
C . indicate destination as a connection identifier
D . map to the DLCI in service internetworking

砌体工程使用冻结法施工时,砂浆强度不得小于(),其中重要结构砂浆强度等级不得小于()。 A.M2.5,M5 。 B.M5,M7.5 。 C.M5,M10 。 D.M7.5,M10。 变压器着火如何处理? 人本主义学习理论主要包括哪些要素? 什么叫电阻? 某县人民法院儿科医生张某,某日晚上在医院值夜班时喝酒,恰好有一个妇女因婴儿上吐下泻而抱婴儿来医院急诊,张某酒兴当头,胡话连篇,不给婴儿检查,反而说婴儿保证没有大问题,让妇女第二天再抱婴儿来看病,结果第二天凌晨,婴儿因严重脱水而死亡。依据《刑法》的规定,张某()。 其行为已经构成了医疗事故罪。 其行为已经构成了玩忽职守罪。 其主观心理是过失。 其主观心理是间接故意。 VLAN Tagging, also known as Frame Tagging, is a method developed by Cisco to help identify packets travelling through trunk links. When an Ethernet frame traverses a trunk link, a special VLAN tag is added to the frame and sent across the trunk link .How does ERS use the VLAN tag?()
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