How does ERS use the VLAN tag?（）
- A、to provide service internetworking
- B、to support transparency for Layer 2 frames
- C、as a connection identifier to indicate destination
- D、as a mapping to the DLCI in service internetworking
- E、to provide a trunk by which all VLANs can navigate from one site to one or multiple sites
正确答案:C
答案解析:有
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