试题详情
- 单项选择题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
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