IEEE802.1ad定义的运营商网桥协议是在以太网帧中插入（ ）字段。
- A.用户划分VLAN的标记
- B.运营商虚电路标识
- C.运营商VLAN标记
- D.MPLS标记
正确答案及解析
正确答案
解析
城域以太网在各个用户以太网之间建立多点第二层连接，IEEE802.1ad定义运营商网桥协议提供的基本技术是在以太网帧中插入运营商VLAN标记字段，这种技术被称为IEEE。
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